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| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7_4" type="checkbox" id="__nav_7_4" > |
| |
| <label class="md-nav__link" for="__nav_7_4"> |
| Troubleshooting GC |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="Troubleshooting GC" data-md-level="2"> |
| <label class="md-nav__title" for="__nav_7_4"> |
| <span class="md-nav__icon md-icon"></span> |
| Troubleshooting GC |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../vgclog/" class="md-nav__link"> |
| Verbose GC logs |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../vgclog_examples/" class="md-nav__link"> |
| Log examples |
| </a> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../jit/" class="md-nav__link"> |
| JIT Compiler |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../jitserver/" class="md-nav__link"> |
| JITServer (tech. preview) |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../aot/" class="md-nav__link"> |
| AOT Compiler |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_11" type="checkbox" id="__nav_11" > |
| |
| <label class="md-nav__link" for="__nav_11"> |
| Class data sharing |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="Class data sharing" data-md-level="1"> |
| <label class="md-nav__title" for="__nav_11"> |
| <span class="md-nav__icon md-icon"></span> |
| Class data sharing |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../shrc/" class="md-nav__link"> |
| Introduction |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../shrc_diag_util/" class="md-nav__link"> |
| Diagnostic cache utilities |
| </a> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../attachapi/" class="md-nav__link"> |
| Java Attach API |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--active md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_13" type="checkbox" id="__nav_13" checked> |
| |
| <label class="md-nav__link" for="__nav_13"> |
| Diagnostics |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="Diagnostics" data-md-level="1"> |
| <label class="md-nav__title" for="__nav_13"> |
| <span class="md-nav__icon md-icon"></span> |
| Diagnostics |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../diag_overview/" class="md-nav__link"> |
| Overview |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--active md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_13_2" type="checkbox" id="__nav_13_2" checked> |
| |
| <label class="md-nav__link" for="__nav_13_2"> |
| Dumps |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="Dumps" data-md-level="2"> |
| <label class="md-nav__title" for="__nav_13_2"> |
| <span class="md-nav__icon md-icon"></span> |
| Dumps |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--active"> |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc"> |
| |
| |
| |
| |
| <label class="md-nav__link md-nav__link--active" for="__toc"> |
| Java dump |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <a href="./" class="md-nav__link md-nav__link--active"> |
| Java dump |
| </a> |
| |
| |
| <nav class="md-nav md-nav--secondary" aria-label="On this page..."> |
| |
| |
| |
| |
| |
| <label class="md-nav__title" for="__toc"> |
| <span class="md-nav__icon md-icon"></span> |
| On this page... |
| </label> |
| <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> |
| |
| <li class="md-nav__item"> |
| <a href="#java-dump-contents" class="md-nav__link"> |
| Java dump contents |
| </a> |
| |
| <nav class="md-nav" aria-label="Java dump contents"> |
| <ul class="md-nav__list"> |
| |
| <li class="md-nav__item"> |
| <a href="#title" class="md-nav__link"> |
| TITLE |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#gpinfo" class="md-nav__link"> |
| GPINFO |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#envinfo" class="md-nav__link"> |
| ENVINFO |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#nativememinfo" class="md-nav__link"> |
| NATIVEMEMINFO |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#meminfo" class="md-nav__link"> |
| MEMINFO |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#locks" class="md-nav__link"> |
| LOCKS |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#threads" class="md-nav__link"> |
| THREADS |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#hooks" class="md-nav__link"> |
| HOOKS |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#shared-classes" class="md-nav__link"> |
| SHARED CLASSES |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#classes" class="md-nav__link"> |
| CLASSES |
| </a> |
| |
| </li> |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#scenarios" class="md-nav__link"> |
| Scenarios |
| </a> |
| |
| <nav class="md-nav" aria-label="Scenarios"> |
| <ul class="md-nav__list"> |
| |
| <li class="md-nav__item"> |
| <a href="#general-protection-fault" class="md-nav__link"> |
| General Protection Fault |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#java-outofmemoryerror" class="md-nav__link"> |
| Java OutOfMemoryError |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#native-outofmemoryerror" class="md-nav__link"> |
| Native OutOfMemoryError |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#deadlock" class="md-nav__link"> |
| Deadlock |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#hang" class="md-nav__link"> |
| Hang |
| </a> |
| |
| </li> |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
| </ul> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dump_heapdump/" class="md-nav__link"> |
| Heap dump |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dump_systemdump/" class="md-nav__link"> |
| System dump |
| </a> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_13_3" type="checkbox" id="__nav_13_3" > |
| |
| <label class="md-nav__link" for="__nav_13_3"> |
| Tools |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="Tools" data-md-level="2"> |
| <label class="md-nav__title" for="__nav_13_3"> |
| <span class="md-nav__icon md-icon"></span> |
| Tools |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_jextract/" class="md-nav__link"> |
| Dump extractor |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_jdmpview/" class="md-nav__link"> |
| Dump viewer |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_traceformat/" class="md-nav__link"> |
| Trace formatter |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_builder/" class="md-nav__link"> |
| Option builder |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_jcmd/" class="md-nav__link"> |
| Java command (jcmd) tool |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_jmap/" class="md-nav__link"> |
| Java memory map (jmap) tool |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_jps/" class="md-nav__link"> |
| Java process status (jps) |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_jstack/" class="md-nav__link"> |
| Java stack (jstack) tool |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_jstat/" class="md-nav__link"> |
| Java statistics monitoring (jstat) tool |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../tool_migration/" class="md-nav__link"> |
| Switching to OpenJ9 |
| </a> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_13_4" type="checkbox" id="__nav_13_4" > |
| |
| <label class="md-nav__link" for="__nav_13_4"> |
| Interfaces |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="Interfaces" data-md-level="2"> |
| <label class="md-nav__title" for="__nav_13_4"> |
| <span class="md-nav__icon md-icon"></span> |
| Interfaces |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../interface_jvmti/" class="md-nav__link"> |
| JVMTI |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../interface_dtfj/" class="md-nav__link"> |
| DTFJ |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../interface_lang_management/" class="md-nav__link"> |
| Language Management |
| </a> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_14" type="checkbox" id="__nav_14" > |
| |
| <label class="md-nav__link" for="__nav_14"> |
| Command-line options |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="Command-line options" data-md-level="1"> |
| <label class="md-nav__title" for="__nav_14"> |
| <span class="md-nav__icon md-icon"></span> |
| Command-line options |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../cmdline_specifying/" class="md-nav__link"> |
| Specifying options |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../cmdline_general/" class="md-nav__link"> |
| Standard options |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../cmdline_migration/" class="md-nav__link"> |
| Switching to OpenJ9 |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_14_4" type="checkbox" id="__nav_14_4" > |
| |
| <label class="md-nav__link" for="__nav_14_4"> |
| System property options |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="System property options" data-md-level="2"> |
| <label class="md-nav__title" for="__nav_14_4"> |
| <span class="md-nav__icon md-icon"></span> |
| System property options |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../d_jvm_commands/" class="md-nav__link"> |
| Using System properties |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmenableclasscaching/" class="md-nav__link"> |
| -Dcom.ibm.enableClassCaching |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmenablelegacydumpsecurity/" class="md-nav__link"> |
| -Dcom.ibm.enableLegacyDumpSecurity |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmenablelegacylogsecurity/" class="md-nav__link"> |
| -Dcom.ibm.enableLegacyLogSecurity |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmenablelegacytracesecurity/" class="md-nav__link"> |
| -Dcom.ibm.enableLegacyTraceSecurity |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmgpudisable/" class="md-nav__link"> |
| -Dcom.ibm.gpu.disable |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmgpuenable/" class="md-nav__link"> |
| -Dcom.ibm.gpu.enable |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmgpuverbose/" class="md-nav__link"> |
| -Dcom.ibm.gpu.verbose |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmlangmanagementosmxbeaniscputime100ns/" class="md-nav__link"> |
| -Dcom.ibm.lang.management.OperatingSystemMXBean.isCpuTime100ns |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmlangmanagementverbose/" class="md-nav__link"> |
| -Dcom.ibm.lang.management.verbose |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmotisharedsharedclassglobalfilterclass/" class="md-nav__link"> |
| -Dcom.ibm.oti.shared.SharedClassGlobalFilterClass |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachcommand_timeout/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.command_timeout |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachdirectory/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.directory |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachdisplayname/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.displayName |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachenable/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.enable |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachid/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.id |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachlogging/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.logging |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachlogname/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.log.name |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachshutdown_timeout/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.shutdown_timeout |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dcomibmtoolsattachtimeout/" class="md-nav__link"> |
| -Dcom.ibm.tools.attach.timeout |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../dfileencoding/" class="md-nav__link"> |
| -Dfile.encoding |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djavacompiler/" class="md-nav__link"> |
| -Djava.compiler |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djavalangstringsubstringnocopy/" class="md-nav__link"> |
| -Djava.lang.string.substring.nocopy |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djavalangstringbuffergrowaggressively/" class="md-nav__link"> |
| -Djava.lang.stringBuffer.growAggressively |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djdknativecbc/" class="md-nav__link"> |
| -Djdk.nativeCBC |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djdknativechacha20/" class="md-nav__link"> |
| -Djdk.nativeChaCha20 |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djdknativecrypto/" class="md-nav__link"> |
| -Djdk.nativeCrypto |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djdknativedigest/" class="md-nav__link"> |
| -Djdk.nativeDigest |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djdknativegcm/" class="md-nav__link"> |
| -Djdk.nativeGCM |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../djdknativersa/" class="md-nav__link"> |
| -Djdk.nativeRSA |
| </a> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_14_5" type="checkbox" id="__nav_14_5" > |
| |
| <label class="md-nav__link" for="__nav_14_5"> |
| JVM -X options |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="JVM -X options" data-md-level="2"> |
| <label class="md-nav__title" for="__nav_14_5"> |
| <span class="md-nav__icon md-icon"></span> |
| JVM -X options |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../x_jvm_commands/" class="md-nav__link"> |
| Using -X options |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../x/" class="md-nav__link"> |
| -X |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xaggressive/" class="md-nav__link"> |
| -Xaggressive |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xalwaysclassgc/" class="md-nav__link"> |
| -Xalwaysclassgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xaot/" class="md-nav__link"> |
| -Xaot |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xargencoding/" class="md-nav__link"> |
| -Xargencoding |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xbootclasspath/" class="md-nav__link"> |
| -Xbootclasspath |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xceehdlr/" class="md-nav__link"> |
| -XCEEHDLR |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcheck/" class="md-nav__link"> |
| -Xcheck |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xclassgc/" class="md-nav__link"> |
| -Xclassgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcodecache/" class="md-nav__link"> |
| -Xcodecache |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcodecachetotal/" class="md-nav__link"> |
| -Xcodecachetotal |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcomp/" class="md-nav__link"> |
| -Xcomp |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcompactexplicitgc/" class="md-nav__link"> |
| -Xcompactexplicitgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcompactgc/" class="md-nav__link"> |
| -Xcompactgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcompilationthreads/" class="md-nav__link"> |
| -XcompilationThreads |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcompressedrefs/" class="md-nav__link"> |
| -Xcompressedrefs |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xconcurrentbackground/" class="md-nav__link"> |
| -Xconcurrentbackground |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xconcurrentlevel/" class="md-nav__link"> |
| -Xconcurrentlevel |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xconcurrentslack/" class="md-nav__link"> |
| -Xconcurrentslack |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xconmeter/" class="md-nav__link"> |
| -Xconmeter |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xenableexcessivegc/" class="md-nav__link"> |
| -Xdisableexcessivegc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xenableexplicitgc/" class="md-nav__link"> |
| -Xdisableexplicitgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xdisablejavadump/" class="md-nav__link"> |
| -Xdisablejavadump |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xenablestringconstantgc/" class="md-nav__link"> |
| -Xdisablestringconstantgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xdump/" class="md-nav__link"> |
| -Xdump |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xenableexcessivegc/" class="md-nav__link"> |
| -Xenableexcessivegc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xenableexplicitgc/" class="md-nav__link"> |
| -Xenableexplicitgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xenablestringconstantgc/" class="md-nav__link"> |
| -Xenablestringconstantgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xfastresolve/" class="md-nav__link"> |
| -Xfastresolve |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xfuture/" class="md-nav__link"> |
| -Xfuture |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xgc/" class="md-nav__link"> |
| -Xgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xgcsplitheap/" class="md-nav__link"> |
| -Xgc:splitheap |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xgcpolicy/" class="md-nav__link"> |
| -Xgcpolicy |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xgcthreads/" class="md-nav__link"> |
| -Xgcthreads |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xgcworkpackets/" class="md-nav__link"> |
| -Xgcworkpackets |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xint/" class="md-nav__link"> |
| -Xint |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xss/" class="md-nav__link"> |
| -Xiss |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xjit/" class="md-nav__link"> |
| -Xjit |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xjni/" class="md-nav__link"> |
| -Xjni |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xlinenumbers/" class="md-nav__link"> |
| -Xlinenumbers |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xloa/" class="md-nav__link"> |
| -Xloa |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xloaminimum/" class="md-nav__link"> |
| -Xloainitial |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xloaminimum/" class="md-nav__link"> |
| -Xloamaximum |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xloaminimum/" class="md-nav__link"> |
| -Xloaminimum |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xlockreservation/" class="md-nav__link"> |
| -XlockReservation |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xlockword/" class="md-nav__link"> |
| -Xlockword |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xlog/" class="md-nav__link"> |
| -Xlog |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xlp/" class="md-nav__link"> |
| -Xlp |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xlpcodecache/" class="md-nav__link"> |
| -Xlp:codecache |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xlpobjectheap/" class="md-nav__link"> |
| -Xlp:objectheap |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmine/" class="md-nav__link"> |
| -Xmaxe |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xminf/" class="md-nav__link"> |
| -Xmaxf |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmint/" class="md-nav__link"> |
| -Xmaxt |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmca/" class="md-nav__link"> |
| -Xmca |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmca/" class="md-nav__link"> |
| -Xmco |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmcrs/" class="md-nav__link"> |
| -Xmcrs |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmine/" class="md-nav__link"> |
| -Xmine |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xminf/" class="md-nav__link"> |
| -Xminf |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmint/" class="md-nav__link"> |
| -Xmint |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmn/" class="md-nav__link"> |
| -Xmn |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmn/" class="md-nav__link"> |
| -Xmns |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmn/" class="md-nav__link"> |
| -Xmnx |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmo/" class="md-nav__link"> |
| -Xmo |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmo/" class="md-nav__link"> |
| -Xmoi |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmo/" class="md-nav__link"> |
| -Xmos |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmo/" class="md-nav__link"> |
| -Xmox |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmr/" class="md-nav__link"> |
| -Xmr |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmr/" class="md-nav__link"> |
| -Xmrx |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xms/" class="md-nav__link"> |
| -Xms |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xmso/" class="md-nav__link"> |
| -Xmso |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xms/" class="md-nav__link"> |
| -Xmx |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xaot/" class="md-nav__link"> |
| -Xnoaot |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xclassgc/" class="md-nav__link"> |
| -Xnoclassgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcompactexplicitgc/" class="md-nav__link"> |
| -Xnocompactexplicitgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcompactgc/" class="md-nav__link"> |
| -Xnocompactgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xcompressedrefs/" class="md-nav__link"> |
| -Xnocompressedrefs |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xjit/" class="md-nav__link"> |
| -Xnojit |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xlinenumbers/" class="md-nav__link"> |
| -Xnolinenumbers |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xloa/" class="md-nav__link"> |
| -Xnoloa |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsigcatch/" class="md-nav__link"> |
| -Xnosigcatch |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsigchain/" class="md-nav__link"> |
| -Xnosigchain |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xnumanone/" class="md-nav__link"> |
| -Xnuma:none |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xoptionsfile/" class="md-nav__link"> |
| -Xoptionsfile |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xquickstart/" class="md-nav__link"> |
| -Xquickstart |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xrs/" class="md-nav__link"> |
| -Xrs |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsamplingexpirationtime/" class="md-nav__link"> |
| -XsamplingExpirationTime |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xscdmx/" class="md-nav__link"> |
| -Xscdmx |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xscminaot/" class="md-nav__link"> |
| -Xscmaxaot |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xscminjitdata/" class="md-nav__link"> |
| -Xscmaxjitdata |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xscminaot/" class="md-nav__link"> |
| -Xscminaot |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xscminjitdata/" class="md-nav__link"> |
| -Xscminjitdata |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xscmx/" class="md-nav__link"> |
| -Xscmx |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xshareclasses/" class="md-nav__link"> |
| -Xshareclasses |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsigcatch/" class="md-nav__link"> |
| -Xsigcatch |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsigchain/" class="md-nav__link"> |
| -Xsigchain |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsignal/" class="md-nav__link"> |
| -Xsignal |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsoftmx/" class="md-nav__link"> |
| -Xsoftmx |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsoftrefthreshold/" class="md-nav__link"> |
| -Xsoftrefthreshold |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xss/" class="md-nav__link"> |
| -Xss |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xss/" class="md-nav__link"> |
| -Xssi |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xsyslog/" class="md-nav__link"> |
| -Xsyslog |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xtgc/" class="md-nav__link"> |
| -Xtgc |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xthr/" class="md-nav__link"> |
| -Xthr |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xtlhprefetch/" class="md-nav__link"> |
| -XtlhPrefetch |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xtrace/" class="md-nav__link"> |
| -Xtrace |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xtunevirtualized/" class="md-nav__link"> |
| -Xtune:virtualized |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xverbosegclog/" class="md-nav__link"> |
| -Xverbosegclog |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xverify/" class="md-nav__link"> |
| -Xverify |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xzero/" class="md-nav__link"> |
| -Xzero |
| </a> |
| </li> |
| |
| |
| |
| </ul> |
| </nav> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_14_6" type="checkbox" id="__nav_14_6" > |
| |
| <label class="md-nav__link" for="__nav_14_6"> |
| JVM -XX options |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| <nav class="md-nav" aria-label="JVM -XX options" data-md-level="2"> |
| <label class="md-nav__title" for="__nav_14_6"> |
| <span class="md-nav__icon md-icon"></span> |
| JVM -XX options |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xx_jvm_commands/" class="md-nav__link"> |
| Using -XX options |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxactiveprocessorcount/" class="md-nav__link"> |
| -XXActiveProcessorCount |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxallowvmshutdown/" class="md-nav__link"> |
| -XXallowvmshutdown |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxalwayspretouch/" class="md-nav__link"> |
| -XX:[+|-]AlwaysPreTouch |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxclassrelationshipverifier/" class="md-nav__link"> |
| -XX:[+|-]ClassRelationshipVerifier |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxconcgcthreads/" class="md-nav__link"> |
| -XX:ConcGCThreads |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxcodecachetotal/" class="md-nav__link"> |
| -XX:codecachetotal |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxcompactstrings/" class="md-nav__link"> |
| -XX:[+|-]CompactStrings |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxdiagnosesynconvaluebasedclasses/" class="md-nav__link"> |
| -XX:DiagnoseSyncOnValueBasedClasses |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxdisableexplicitgc/" class="md-nav__link"> |
| -XX:[+|-]DisableExplicitGC |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxdisclaimjitscratch/" class="md-nav__link"> |
| -XX:[+|-]DisclaimJitScratch |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxenablecpumonitor/" class="md-nav__link"> |
| -XX:[+|-]EnableCPUMonitor |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxexitonoutofmemoryerror/" class="md-nav__link"> |
| -XX:[+|-]ExitOnOutOfMemoryError |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxgloballockreservation/" class="md-nav__link"> |
| -XX:[+|-]GlobalLockReservation |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxhandlesigxfsz/" class="md-nav__link"> |
| -XX:[+|-]HandleSIGXFSZ |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxhandlesigabrt/" class="md-nav__link"> |
| -XX:[+|-]HandleSIGABRT |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxheapdumponoutofmemory/" class="md-nav__link"> |
| -XX:[+|-]HeapDumpOnOutOfMemory |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxheapdumppath/" class="md-nav__link"> |
| -XX:HeapDumpPath |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxheapmanagementmxbeancompatibility/" class="md-nav__link"> |
| -XX:[+|-]HeapManagementMXBeanCompatibility |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxidletuningcompactonidle/" class="md-nav__link"> |
| -XX:[+|-]IdleTuningCompactOnIdle |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxidletuninggconidle/" class="md-nav__link"> |
| -XX:[+|-]IdleTuningGcOnIdle |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxidletuningminfreeheaponidle/" class="md-nav__link"> |
| -XX:IdleTuningMinFreeHeapOnIdle |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxidletuningminidlewaittime/" class="md-nav__link"> |
| -XX:IdleTuningMinIdleWaitTime |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxignoreunrecognizedvmoptions/" class="md-nav__link"> |
| -XX:[+|-]IgnoreUnrecognizedVMOptions |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxignoreunrecognizedxxcolonoptions/" class="md-nav__link"> |
| -XX:[+|-]IgnoreUnrecognizedXXColonOptions |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxinitialrampercentage/" class="md-nav__link"> |
| -XX:InitialRAMPercentage |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxinitialheapsize/" class="md-nav__link"> |
| -XX:InitialHeapSize |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxinterleavememory/" class="md-nav__link"> |
| -XX:[+|-]InterleaveMemory |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxjitinlinewatches/" class="md-nav__link"> |
| -XX:[+|-]JITInlineWatches |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxlazysymbolresolution/" class="md-nav__link"> |
| -XX:[+|-]LazySymbolResolution |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxlegacyxlogoption/" class="md-nav__link"> |
| -XX:[+|-]LegacyXLogOption |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxmaxdirectmemorysize/" class="md-nav__link"> |
| -XX:MaxDirectMemorySize |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxinitialheapsize/" class="md-nav__link"> |
| -XX:MaxHeapSize |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxinitialrampercentage/" class="md-nav__link"> |
| -XX:MaxRAMPercentage |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxonoutofmemoryerror/" class="md-nav__link"> |
| -XX:OnOutOfMemoryError |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxoriginaljdk8heapsizecompatibilitymode/" class="md-nav__link"> |
| -XX:[+|-]OriginalJDK8HeapSizeCompatibilityMode |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxnosuballoc32bitmem/" class="md-nav__link"> |
| -XXnosuballoc32bitmem |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxpagealigndirectmemory/" class="md-nav__link"> |
| -XX:[+|-]PageAlignDirectMemory |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxparallelcmsthreads/" class="md-nav__link"> |
| -XX:ParallelCMSThreads |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxparallelgcthreads/" class="md-nav__link"> |
| -XX:ParallelGCThreads |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxportablesharedcache/" class="md-nav__link"> |
| -XX:[+|-]PortableSharedCache |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxpositiveidentityhash/" class="md-nav__link"> |
| -XX:[+|-]PositiveIdentityHash |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxprintcodecache/" class="md-nav__link"> |
| -XX:[+|-]PrintCodeCache |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxprintflagsfinal/" class="md-nav__link"> |
| -XX:[+|-]PrintFlagsFinal |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxreadipinfoforras/" class="md-nav__link"> |
| -XX:[+|-]ReadIPInfoForRAS |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxreducecpumonitoroverhead/" class="md-nav__link"> |
| -XX:[+|-]ReduceCPUMonitorOverhead |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxruntimeinstrumentation/" class="md-nav__link"> |
| -XX:[+|-]RuntimeInstrumentation |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxsethwprefetch/" class="md-nav__link"> |
| -XXsetHWPrefetch |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxshareanonymousclasses/" class="md-nav__link"> |
| -XX:[+|-]ShareAnonymousClasses |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxshareclassesenablebci/" class="md-nav__link"> |
| -XX:ShareClassesDisableBCI |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxshareclassesenablebci/" class="md-nav__link"> |
| -XX:ShareClassesEnableBCI |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxsharedcachehardlimit/" class="md-nav__link"> |
| -XX:SharedCacheHardLimit |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxshareunsafeclasses/" class="md-nav__link"> |
| -XX:[+|-]ShareUnsafeClasses |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxstacktraceinthrowable/" class="md-nav__link"> |
| -XX:-StackTraceInThrowable |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxtransparenthugepage/" class="md-nav__link"> |
| -XX:[+|-]TransparentHugePage |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxusecompressedoops/" class="md-nav__link"> |
| -XX:[+|-]UseCompressedOops |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxusecontainersupport/" class="md-nav__link"> |
| -XX:[+|-]UseContainerSupport |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxusegcstartuphints/" class="md-nav__link"> |
| -XX:[+|-]UseGCStartupHints |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../xxusenogc/" class="md-nav__link"> |
| -XX:[+|-]UseNoGC |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
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| |
| <h1 id="java-dump">Java dump</h1> |
| <p>Java dumps, sometimes referred to as <em>Java cores</em>, are produced when the VM ends unexpectedly because of an operating system signal, <code>OutOfMemoryError</code>, or a user-initiated keystroke combination. You can also generate a Java dump by calling the Dump API programmatically from your application or specifying the <code>-Xdump:java</code> option on the command line.</p> |
| <p>If your Java application crashes or hangs, Java dumps can provide useful information to help you diagnose the root cause.</p> |
| <ul> |
| <li>If your application crashes, Java dumps are generated automatically for the following types of failure:<ul> |
| <li>the VM receives an unexpected signal or an assertion failure</li> |
| <li>the VM runs out of memory</li> |
| </ul> |
| </li> |
| <li> |
| <p>If your application hangs, you can trigger the generation of a Java dump by sending a SIGQUIT signal (<code>kill -3</code>) to the VM.</p> |
| <p><span aria-hidden="true" class="twemoji note"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M497.9 142.1l-46.1 46.1c-4.7 4.7-12.3 4.7-17 0l-111-111c-4.7-4.7-4.7-12.3 0-17l46.1-46.1c18.7-18.7 49.1-18.7 67.9 0l60.1 60.1c18.8 18.7 18.8 49.1 0 67.9zM284.2 99.8L21.6 362.4.4 483.9c-2.9 16.4 11.4 30.6 27.8 27.8l121.5-21.3 262.6-262.6c4.7-4.7 4.7-12.3 0-17l-111-111c-4.8-4.7-12.4-4.7-17.1 0zM124.1 339.9c-5.5-5.5-5.5-14.3 0-19.8l154-154c5.5-5.5 14.3-5.5 19.8 0s5.5 14.3 0 19.8l-154 154c-5.5 5.5-14.3 5.5-19.8 0zM88 424h48v36.3l-64.5 11.3-31.1-31.1L51.7 376H88v48z"/></svg></span> <strong>Note:</strong> On Windows, if you started the VM in a console window you can force the VM to produce a Java dump in response to a SIGBREAK signal |
| (Ctrl-Break keyboard combination). If you didn't start in a console window there is no equivalent to a Linux <code>kill</code> command on Windows for sending signals. |
| The only option here is to trigger a full system dump by finding the VM process in the <strong>Processes</strong> tab of the Windows Task Manager and clicking |
| <strong>Create dump file</strong>.</p> |
| </li> |
| </ul> |
| <p>To help you understand how a Java dump can help you with problem diagnosis, this topic includes a few scenarios to help you interpret the data:</p> |
| <ul> |
| <li><a href="#general-protection-fault">A crash caused by a general protection fault (gpf)</a></li> |
| <li><a href="#java-outofmemoryerror">A Java heap OutOfMemoryError (OOM)</a></li> |
| <li><a href="#native-outofmemoryerror">A native OutOfMemoryError (OOM)</a></li> |
| <li><a href="#deadlock">A deadlock situation</a></li> |
| <li><a href="#hang">A hang</a></li> |
| </ul> |
| <h2 id="java-dump-contents">Java dump contents</h2> |
| <p>Java dumps summarize the state of the VM when the event occurs, with most of the information relating to components of the VM. |
| The file is made up of a number of sections that provide different types of information.</p> |
| <h3 id="title">TITLE</h3> |
| <p>The first section of the Java dump file provides information about the event that triggered the production of the dump. |
| In the following example you can see that a <code>vmstop</code> event triggered the dump at a specified date and time.</p> |
| <pre><code>0SECTION TITLE subcomponent dump routine |
| NULL =============================== |
| 1TICHARSET UTF-8 |
| 1TISIGINFO Dump Event "vmstop" (00000002) Detail "#0000000000000000" received |
| 1TIDATETIME Date: 2018/08/30 at 21:55:47:607 |
| 1TINANOTIME System nanotime: 22012355276134 |
| 1TIFILENAME Javacore filename: /home/doc-javacore/javacore.20180830.215547.30285.0001.txt |
| 1TIREQFLAGS Request Flags: 0x81 (exclusive+preempt) |
| 1TIPREPSTATE Prep State: 0x106 (vm_access+exclusive_vm_access+trace_disabled) |
| </code></pre> |
| |
| <h3 id="gpinfo">GPINFO</h3> |
| <p>The GPINFO section provides general information about the system that the VM is running on. The following example is taken |
| from a Java dump that was generated on a Linux system.</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION GPINFO subcomponent dump routine |
| NULL ================================ |
| 2XHOSLEVEL OS Level : Linux 3.10.0-862.11.6.el7.x86_64 |
| 2XHCPUS Processors - |
| 3XHCPUARCH Architecture : amd64 |
| 3XHNUMCPUS How Many : 4 |
| 3XHNUMASUP NUMA is either not supported or has been disabled by user |
| NULL |
| 1XHERROR2 Register dump section only produced for SIGSEGV, SIGILL or SIGFPE. |
| NULL |
| </code></pre> |
| |
| <p>The content of this section can vary, depending on the cause of the dump. For example, if the dump was caused by a |
| general protection fault (gpf), the library in which the crash occurred is also recorded, together with a value shown |
| as <code>VM flags</code>. This value can provide some clues about which component of the VM might have been involved. Look for the |
| following line in the output:</p> |
| <pre><code>1XHFLAGS VM flags:0000000000000000 |
| </code></pre> |
| |
| <p>The hexadecimal number recorded for <code>VM flags</code> ends in MSSSS, where M is the VM component and SSSS is component-specific code as shown in the following table:</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Component</th> |
| <th>Code value</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>INTERPRETER</td> |
| <td>0x10000</td> |
| </tr> |
| <tr> |
| <td>GC</td> |
| <td>0x20000</td> |
| </tr> |
| <tr> |
| <td>GROW_STACK</td> |
| <td>0x30000</td> |
| </tr> |
| <tr> |
| <td>JNI</td> |
| <td>0x40000</td> |
| </tr> |
| <tr> |
| <td>JIT_CODEGEN</td> |
| <td>0x50000</td> |
| </tr> |
| <tr> |
| <td>BCVERIFY</td> |
| <td>0x60000</td> |
| </tr> |
| <tr> |
| <td>RTVERIFY</td> |
| <td>0x70000</td> |
| </tr> |
| <tr> |
| <td>SHAREDCLASSES</td> |
| <td>0x80000</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>A value of <code>0000000000000000</code> (0x00000) indicates that a crash occurred outside of the VM.</p> |
| <h3 id="envinfo">ENVINFO</h3> |
| <p>This section contains useful information about the environment in which the crash took place, including the following data:</p> |
| <ul> |
| <li>Java version (<code>1CIJAVAVERSION</code>)</li> |
| <li>OpenJ9 VM and subcomponent version information (<code>1CIVMVERSION</code>, <code>1CIJ9VMVERSION</code>, <code>1CIJITVERSION</code>, <code>1CIOMRVERSION</code>, <code>1CIJCLVERSION</code>)</li> |
| <li>VM start time (<code>1CISTARTTIME</code>) and process information (<code>1CIPROCESSID</code>)</li> |
| <li>Java home (<code>1CIJAVAHOMEDIR</code>) and DLL (<code>1CIJAVADLLDIR</code>) directories</li> |
| <li>User arguments passed on the command line (<code>1CIUSERARG</code>)</li> |
| <li>User limits imposed by the system (<code>1CIUSERLIMITS</code>)</li> |
| <li>Environment variables in place (<code>1CIENVVARS</code>)</li> |
| <li>System information (<code>1CISYSINFO</code>)</li> |
| <li>CPU information (<code>1CICPUINFO</code>)</li> |
| <li>Control group (Cgroup) information (<code>1CICGRPINFO</code>)</li> |
| </ul> |
| <p>For clarity, the following example shows a shortened version of this section, where <code>...</code> indicates that lines are removed:</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION ENVINFO subcomponent dump routine |
| NULL ================================= |
| 1CIJAVAVERSION JRE 9 Linux amd64-64 (build 9.0.4-internal+0-adhoc..openj9-openjdk-jdk9) |
| 1CIVMVERSION 20180830_000000 |
| 1CIJ9VMVERSION 8e7c6ec |
| 1CIJITVERSION 8e7c6ec |
| 1CIOMRVERSION 553811b_CMPRSS |
| 1CIJCLVERSION ec1d223 based on jdk-9.0.4+12 |
| 1CIJITMODES JIT enabled, AOT enabled, FSD disabled, HCR enabled |
| 1CIRUNNINGAS Running as a standalone JVM |
| 1CIVMIDLESTATE VM Idle State: ACTIVE |
| 1CICONTINFO Running in container : FALSE |
| 1CICGRPINFO JVM support for cgroups enabled : TRUE |
| 1CISTARTTIME JVM start time: 2018/08/30 at 21:55:47:387 |
| 1CISTARTNANO JVM start nanotime: 22012135233549 |
| 1CIPROCESSID Process ID: 30285 (0x764D) |
| 1CICMDLINE [not available] |
| 1CIJAVAHOMEDIR Java Home Dir: /home/me/openj9-openjdk-jdk9/build/linux-x86_64-normal-server-release/images/jdk |
| 1CIJAVADLLDIR Java DLL Dir: /home/me/openj9-openjdk-jdk9/build/linux-x86_64-normal-server-release/images/jdk/bin |
| 1CISYSCP Sys Classpath: |
| 1CIUSERARGS UserArgs: |
| 2CIUSERARG -Xoptionsfile=/home/me/openj9-openjdk-jdk9/build/linux-x86_64-normal-server-release/images/jdk/lib/options.default |
| ... |
| NULL |
| 1CIUSERLIMITS User Limits (in bytes except for NOFILE and NPROC) |
| NULL ------------------------------------------------------------------------ |
| NULL type soft limit hard limit |
| 2CIUSERLIMIT RLIMIT_AS unlimited unlimited |
| 2CIUSERLIMIT RLIMIT_CORE 0 unlimited |
| 2CIUSERLIMIT RLIMIT_CPU unlimited unlimited |
| 2CIUSERLIMIT RLIMIT_DATA unlimited unlimited |
| 2CIUSERLIMIT RLIMIT_FSIZE unlimited unlimited |
| 2CIUSERLIMIT RLIMIT_LOCKS unlimited unlimited |
| 2CIUSERLIMIT RLIMIT_MEMLOCK 65536 65536 |
| 2CIUSERLIMIT RLIMIT_NOFILE 4096 4096 |
| 2CIUSERLIMIT RLIMIT_NPROC 4096 30592 |
| 2CIUSERLIMIT RLIMIT_RSS unlimited unlimited |
| 2CIUSERLIMIT RLIMIT_STACK 8388608 unlimited |
| 2CIUSERLIMIT RLIMIT_MSGQUEUE 819200 819200 |
| 2CIUSERLIMIT RLIMIT_NICE 0 0 |
| 2CIUSERLIMIT RLIMIT_RTPRIO 0 0 |
| 2CIUSERLIMIT RLIMIT_SIGPENDING 30592 30592 |
| NULL |
| 1CIENVVARS Environment Variables |
| NULL ------------------------------------------------------------------------ |
| 2CIENVVAR XDG_VTNR=1 |
| 2CIENVVAR SSH_AGENT_PID=2653 |
| ... |
| NULL |
| 1CISYSINFO System Information |
| NULL ------------------------------------------------------------------------ |
| 2CISYSINFO /proc/sys/kernel/core_pattern = core |
| 2CISYSINFO /proc/sys/kernel/core_uses_pid = 1 |
| NULL |
| 1CICPUINFO CPU Information |
| NULL ------------------------------------------------------------------------ |
| 2CIPHYSCPU Physical CPUs: 8 |
| 2CIONLNCPU Online CPUs: 8 |
| 2CIBOUNDCPU Bound CPUs: 8 |
| 2CIACTIVECPU Active CPUs: 0 |
| 2CITARGETCPU Target CPUs: 8 |
| 2CIJITFEATURE CPU features (JIT): fpu cx8 cmov mmx sse sse2 ssse3 fma sse4_1 popcnt aesni osxsave avx avx2 rdt_m |
| 2CIAOTFEATURE CPU features (AOT): fpu cx8 cmov mmx sse sse2 ssse3 fma sse4_1 popcnt aesni osxsave avx avx2 rdt_m |
| NULL |
| 1CICGRPINFO Cgroup Information |
| NULL ------------------------------------------------------------------------ |
| 2CICGRPINFO subsystem : cpu |
| 2CICGRPINFO cgroup name : / |
| 3CICGRPINFO CPU Period : 100000 microseconds |
| 3CICGRPINFO CPU Quota : Not Set |
| 3CICGRPINFO CPU Shares : 1024 |
| 3CICGRPINFO Period intervals elapsed count : 0 |
| 3CICGRPINFO Throttled count : 0 |
| 3CICGRPINFO Total throttle time : 0 nanoseconds |
| 2CICGRPINFO subsystem : cpuset |
| 2CICGRPINFO cgroup name : / |
| 3CICGRPINFO CPU exclusive : 1 |
| 3CICGRPINFO Mem exclusive : 1 |
| 3CICGRPINFO CPUs : 0-7 |
| 3CICGRPINFO Mems : 0 |
| 2CICGRPINFO subsystem : memory |
| 2CICGRPINFO cgroup name : / |
| 3CICGRPINFO Memory Limit : Not Set |
| 3CICGRPINFO Memory + Swap Limit : Not Set |
| 3CICGRPINFO Memory Usage : 5363396608 bytes |
| 3CICGRPINFO Memory + Swap Usage : 5363396608 bytes |
| 3CICGRPINFO Memory Max Usage : 0 bytes |
| 3CICGRPINFO Memory + Swap Max Usage : 0 bytes |
| 3CICGRPINFO Memory limit exceeded count : 0 |
| 3CICGRPINFO Memory + Swap limit exceeded count : 0 |
| 3CICGRPINFO OOM Killer Disabled : 0 |
| 3CICGRPINFO Under OOM : 0 |
| NULL |
| </code></pre> |
| |
| <h3 id="nativememinfo">NATIVEMEMINFO</h3> |
| <p>This section records information about native memory that is requested by using library functions such as <code>malloc()</code> and <code>mmap()</code>. |
| Values are provided as a breakdown, per component, indicating the total number of bytes allocated and the number of native memory allocations. |
| In the following example, 4,682,840 bytes of native memory are allocated (but not yet freed) to VM Classes, which corresponds to 141 allocations.</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION NATIVEMEMINFO subcomponent dump routine |
| NULL ================================= |
| 0MEMUSER |
| 1MEMUSER JRE: 2,569,088,312 bytes / 4653 allocations |
| 1MEMUSER | |
| 2MEMUSER +--VM: 2,280,088,336 bytes / 2423 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Classes: 4,682,840 bytes / 141 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Memory Manager (GC): 2,054,966,784 bytes / 433 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Java Heap: 2,014,113,792 bytes / 1 allocation |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Other: 40,852,992 bytes / 432 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Threads: 10,970,016 bytes / 156 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Java Stack: 197,760 bytes / 16 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Native Stack: 10,616,832 bytes / 17 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Other: 155,424 bytes / 123 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Trace: 180,056 bytes / 263 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--JVMTI: 17,776 bytes / 13 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--JNI: 36,184 bytes / 52 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Port Library: 208,179,632 bytes / 72 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Unused <32bit allocation regions: 208,168,752 bytes / 1 allocation |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Other: 10,880 bytes / 71 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Other: 1,055,048 bytes / 1293 allocations |
| 1MEMUSER | |
| 2MEMUSER +--JIT: 288,472,816 bytes / 140 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--JIT Code Cache: 268,435,456 bytes / 1 allocation |
| 2MEMUSER | | |
| 3MEMUSER | +--JIT Data Cache: 2,097,216 bytes / 1 allocation |
| 2MEMUSER | | |
| 3MEMUSER | +--Other: 17,940,144 bytes / 138 allocations |
| 1MEMUSER | |
| 2MEMUSER +--Class Libraries: 13,432 bytes / 25 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--VM Class Libraries: 13,432 bytes / 25 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--sun.misc.Unsafe: 3,184 bytes / 13 allocations |
| 4MEMUSER | | | | |
| 5MEMUSER | | | +--Direct Byte Buffers: 1,056 bytes / 12 allocations |
| 4MEMUSER | | | | |
| 5MEMUSER | | | +--Other: 2,128 bytes / 1 allocation |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Other: 10,248 bytes / 12 allocations |
| 1MEMUSER | |
| 2MEMUSER +--Unknown: 513,728 bytes / 2065 allocations |
| NULL |
| </code></pre> |
| |
| <p>This section does not record memory that is allocated by application or JNI code and is typically a little less than the |
| value recorded by operating system tools.</p> |
| <h3 id="meminfo">MEMINFO</h3> |
| <p>This section relates to memory management, providing a breakdown of memory usage in the VM for the object heap, |
| internal memory, memory used for classes, the JIT code cache, and JIT data cache in decimal and hexadecimal format. |
| You can also find out which garbage collection policy is in use when the dump is produced. </p> |
| <p>The object memory area (<code>1STHEAPTYPE</code>) records each memory region in use, its start and end address, and region size. |
| Further information is recorded about the memory segments used for internal memory, class memory, the JIT code cache and JIT data cache (<code>1STSEGMENT</code>). |
| This information includes the address of the segment control data structure, the start and end address of the native memory segment, as well as |
| the segment size.</p> |
| <p>For clarity, the following example shows a shortened version of this section, where <code>...</code> indicates that lines are removed:</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION MEMINFO subcomponent dump routine |
| NULL ================================= |
| NULL |
| 1STHEAPTYPE Object Memory |
| NULL id start end size space/region |
| 1STHEAPSPACE 0x00007FF4F00744A0 -- -- -- Generational |
| 1STHEAPREGION 0x00007FF4F0074CE0 0x0000000087F40000 0x0000000088540000 0x0000000000600000 Generational/Tenured Region |
| 1STHEAPREGION 0x00007FF4F0074930 0x00000000FFE00000 0x00000000FFF00000 0x0000000000100000 Generational/Nursery Region |
| 1STHEAPREGION 0x00007FF4F0074580 0x00000000FFF00000 0x0000000100000000 0x0000000000100000 Generational/Nursery Region |
| NULL |
| 1STHEAPTOTAL Total memory: 8388608 (0x0000000000800000) |
| 1STHEAPINUSE Total memory in use: 2030408 (0x00000000001EFB48) |
| 1STHEAPFREE Total memory free: 6358200 (0x00000000006104B8) |
| NULL |
| 1STSEGTYPE Internal Memory |
| NULL segment start alloc end type size |
| 1STSEGMENT 0x00007FF4F004CBC8 0x00007FF4CD33C000 0x00007FF4CD33C000 0x00007FF4CE33C000 0x01000440 0x0000000001000000 |
| 1STSEGMENT 0x00007FF4F004CB08 0x00007FF4DE43D030 0x00007FF4DE517770 0x00007FF4DE53D030 0x00800040 0x0000000000100000 |
| NULL |
| 1STSEGTOTAL Total memory: 17825792 (0x0000000001100000) |
| 1STSEGINUSE Total memory in use: 894784 (0x00000000000DA740) |
| 1STSEGFREE Total memory free: 16931008 (0x00000000010258C0) |
| NULL |
| 1STSEGTYPE Class Memory |
| NULL segment start alloc end type size |
| 1STSEGMENT 0x00007FF4F03B5638 0x0000000001053D98 0x000000000105BD98 0x000000000105BD98 0x00010040 0x0000000000008000 |
| 1STSEGMENT 0x00007FF4F03B5578 0x0000000001048188 0x0000000001050188 0x0000000001050188 0x00010040 0x0000000000008000 |
| ... |
| NULL |
| 1STSEGTOTAL Total memory: 3512520 (0x00000000003598C8) |
| 1STSEGINUSE Total memory in use: 3433944 (0x00000000003465D8) |
| 1STSEGFREE Total memory free: 78576 (0x00000000000132F0) |
| NULL |
| 1STSEGTYPE JIT Code Cache |
| NULL segment start alloc end type size |
| 1STSEGMENT 0x00007FF4F00961F8 0x00007FF4CE43D000 0x00007FF4CE445790 0x00007FF4DE43D000 0x00000068 0x0000000010000000 |
| NULL |
| 1STSEGTOTAL Total memory: 268435456 (0x0000000010000000) |
| 1STSEGINUSE Total memory in use: 34704 (0x0000000000008790) |
| 1STSEGFREE Total memory free: 268400752 (0x000000000FFF7870) |
| 1STSEGLIMIT Allocation limit: 268435456 (0x0000000010000000) |
| NULL |
| 1STSEGTYPE JIT Data Cache |
| NULL segment start alloc end type size |
| 1STSEGMENT 0x00007FF4F0096668 0x00007FF4CC553030 0x00007FF4CC753030 0x00007FF4CC753030 0x00000048 0x0000000000200000 |
| NULL |
| 1STSEGTOTAL Total memory: 2097152 (0x0000000000200000) |
| 1STSEGINUSE Total memory in use: 2097152 (0x0000000000200000) |
| 1STSEGFREE Total memory free: 0 (0x0000000000000000) |
| 1STSEGLIMIT Allocation limit: 402653184 (0x0000000018000000) |
| NULL |
| 1STGCHTYPE GC History |
| NULL |
| </code></pre> |
| |
| <p>In the example, the GC History (<code>1STGCHTYPE</code>) section is blank. This section is populated if a garbage collection cycle occurred in |
| a VM that is being diagnosed with the trace facility.</p> |
| <h3 id="locks">LOCKS</h3> |
| <p>This section of the Java dump provides information about locks, which protect shared resources from being accessed by more than one entity at a time. The information is essential in a deadlock situation, where two threads attempt to synchronize on an object and lock an instance of a class. Precise information is recorded about the threads that are causing the problem, which enables you to identify the root cause.</p> |
| <p>The following example shows a typical LOCKS section, where no deadlocks existed at the time the dump was triggered. For clarity, the following example shows a shortened version of this section, where <code>...</code> indicates that lines are removed:</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION LOCKS subcomponent dump routine |
| NULL =============================== |
| NULL |
| 1LKPOOLINFO Monitor pool info: |
| 2LKPOOLTOTAL Current total number of monitors: 3 |
| NULL |
| 1LKMONPOOLDUMP Monitor Pool Dump (flat & inflated object-monitors): |
| 2LKMONINUSE sys_mon_t:0x00007FF4B0001D78 infl_mon_t: 0x00007FF4B0001DF8: |
| 3LKMONOBJECT java/lang/ref/ReferenceQueue@0x00000000FFE26A10: <unowned> |
| 3LKNOTIFYQ Waiting to be notified: |
| 3LKWAITNOTIFY "Common-Cleaner" (J9VMThread:0x0000000000FD0100) |
| NULL |
| 1LKREGMONDUMP JVM System Monitor Dump (registered monitors): |
| 2LKREGMON Thread global lock (0x00007FF4F0004FE8): <unowned> |
| 2LKREGMON &(PPG_mem_mem32_subAllocHeapMem32.monitor) lock (0x00007FF4F0005098): <unowned> |
| 2LKREGMON NLS hash table lock (0x00007FF4F0005148): <unowned> |
| ... |
| NULL |
| </code></pre> |
| |
| <h3 id="threads">THREADS</h3> |
| <p>The THREADS section of a Java dump file provides summary information about the VM thread pool and detailed information about Java threads, native threads, and stack traces. Understanding the content of this section can help you diagnose problems that are caused by blocked or waiting threads.</p> |
| <p>A Java thread runs on a native thread. Several lines are recorded for each Java thread in the <code>Thread Details</code> subsection, which include the following key pieces of information:</p> |
| <ul> |
| <li><code>3XMTHREADINFO</code>: The thread name, address information for the VM thread structures and Java thread object, the thread state, and thread priority.</li> |
| <li><code>3XMJAVALTHREAD</code>: The Java thread ID and daemon status from the thread object.</li> |
| <li><code>3XMTHREADINFO1</code>: The native operating system thread ID, priority, scheduling policy, internal VM thread state, and VM thread flags.</li> |
| <li><code>3XMTHREADINFO2</code>: The native stack address range.</li> |
| <li><code>3XMTHREADINFO3</code>: Java callstack information (<code>4XESTACKTRACE</code>) or Native call stack information (<code>4XENATIVESTACK</code>).</li> |
| <li><code>5XESTACKTRACE</code>: This line indicates whether locks were taken by a specific method.</li> |
| </ul> |
| <p>Java thread priorities are mapped to operating system priority values. Thread states are shown in the following table:</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Thread state value</th> |
| <th>Status</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>R</td> |
| <td>Runnable</td> |
| <td>The thread is able to run</td> |
| </tr> |
| <tr> |
| <td>CW</td> |
| <td>Condition Wait</td> |
| <td>The thread is waiting</td> |
| </tr> |
| <tr> |
| <td>S</td> |
| <td>Suspended</td> |
| <td>The thread is suspended by another thread</td> |
| </tr> |
| <tr> |
| <td>Z</td> |
| <td>Zombie</td> |
| <td>The thread is destroyed</td> |
| </tr> |
| <tr> |
| <td>P</td> |
| <td>Parked</td> |
| <td>The thread is parked by <code>java.util.concurrent</code></td> |
| </tr> |
| <tr> |
| <td>B</td> |
| <td>Blocked</td> |
| <td>The thread is waiting to obtain a lock</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>For threads that are parked (P), blocked (B), or waiting (CW), an additional line (<code>3XMTHREADBLOCK</code>) is included in the output that shows what the thread is parked on, blocked on, or waiting for.</p> |
| <p>For clarity, the following example shows a shortened version of a typical THREADS section, where <code>...</code> indicates that lines are removed:</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION THREADS subcomponent dump routine |
| NULL ================================= |
| NULL |
| 1XMPOOLINFO JVM Thread pool info: |
| 2XMPOOLTOTAL Current total number of pooled threads: 18 |
| 2XMPOOLLIVE Current total number of live threads: 16 |
| 2XMPOOLDAEMON Current total number of live daemon threads: 15 |
| NULL |
| 1XMTHDINFO Thread Details |
| NULL |
| 3XMTHREADINFO "JIT Diagnostic Compilation Thread-7 Suspended" J9VMThread:0x0000000000EFC500, omrthread_t:0x00007FF4F00A77E8, java/lang/Thread:0x00000000FFE97480, state:R, prio=10 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0xA, isDaemon:true) |
| 3XMTHREADINFO1 (native thread ID:0x7657, native priority:0xB, native policy:UNKNOWN, vmstate:CW, vm thread flags:0x00000081) |
| 3XMTHREADINFO2 (native stack address range from:0x00007FF4CCC36000, to:0x00007FF4CCD36000, size:0x100000) |
| 3XMCPUTIME CPU usage total: 0.000037663 secs, current category="JIT" |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 No Java callstack associated with this thread |
| 3XMTHREADINFO3 No native callstack available for this thread |
| NULL |
| ... |
| 3XMTHREADINFO "Common-Cleaner" J9VMThread:0x0000000000FD0100, omrthread_t:0x00007FF4F022A520, java/lang/Thread:0x00000000FFE26F40, state:CW, prio=8 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0x2, isDaemon:true) |
| 3XMTHREADINFO1 (native thread ID:0x765A, native priority:0x8, native policy:UNKNOWN, vmstate:CW, vm thread flags:0x00080181) |
| 3XMTHREADINFO2 (native stack address range from:0x00007FF4CC0B8000, to:0x00007FF4CC0F8000, size:0x40000) |
| 3XMCPUTIME CPU usage total: 0.000150926 secs, current category="Application" |
| 3XMTHREADBLOCK Waiting on: java/lang/ref/ReferenceQueue@0x00000000FFE26A10 Owned by: <unowned> |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 Java callstack: |
| 4XESTACKTRACE at java/lang/Object.wait(Native Method) |
| 4XESTACKTRACE at java/lang/Object.wait(Object.java:221) |
| 4XESTACKTRACE at java/lang/ref/ReferenceQueue.remove(ReferenceQueue.java:138) |
| 5XESTACKTRACE (entered lock: java/lang/ref/ReferenceQueue@0x00000000FFE26A10, entry count: 1) |
| 4XESTACKTRACE at jdk/internal/ref/CleanerImpl.run(CleanerImpl.java:148) |
| 4XESTACKTRACE at java/lang/Thread.run(Thread.java:835) |
| 4XESTACKTRACE at jdk/internal/misc/InnocuousThread.run(InnocuousThread.java:122) |
| 3XMTHREADINFO3 No native callstack available for this thread |
| NULL |
| NULL |
| 3XMTHREADINFO "IProfiler" J9VMThread:0x0000000000F03D00, omrthread_t:0x00007FF4F00B06F8, java/lang/Thread:0x00000000FFE97B60, state:R, prio=5 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0xC, isDaemon:true) |
| 3XMTHREADINFO1 (native thread ID:0x7659, native priority:0x5, native policy:UNKNOWN, vmstate:CW, vm thread flags:0x00000081) |
| 3XMTHREADINFO2 (native stack address range from:0x00007FF4F8940000, to:0x00007FF4F8960000, size:0x20000) |
| 3XMCPUTIME CPU usage total: 0.004753103 secs, current category="JIT" |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 No Java callstack associated with this thread |
| 3XMTHREADINFO3 No native callstack available for this thread |
| NULL |
| ... |
| 1XMWLKTHDERR The following was reported while collecting native stacks: |
| 2XMWLKTHDERR unable to count threads(3, -2) |
| NULL |
| 1XMTHDSUMMARY Threads CPU Usage Summary |
| NULL ========================= |
| NULL |
| 1XMTHDCATINFO Warning: to get more accurate CPU times for the GC, the option -XX:-ReduceCPUMonitorOverhead can be used. See the user guide for more information. |
| NULL |
| 1XMTHDCATEGORY All JVM attached threads: 0.280083000 secs |
| 1XMTHDCATEGORY | |
| 2XMTHDCATEGORY +--System-JVM: 0.270814000 secs |
| 2XMTHDCATEGORY | | |
| 3XMTHDCATEGORY | +--GC: 0.000599000 secs |
| 2XMTHDCATEGORY | | |
| 3XMTHDCATEGORY | +--JIT: 0.071904000 secs |
| 1XMTHDCATEGORY | |
| 2XMTHDCATEGORY +--Application: 0.009269000 secs |
| NULL |
| </code></pre> |
| |
| <h3 id="hooks">HOOKS</h3> |
| <p>This section shows internal VM event callbacks, which are used for diagnosing performance problems in the VM. Multiple hook interfaces are listed, which include their individual hook events.</p> |
| <p>The following example shows data for the <code>J9VMHookInterface</code>, including the total time for all previous events, the call site location (<source file>:<line number>), start time, and duration of the last callback and the longest callback (all times measured in microseconds). The hook data is reset after each Java dump.</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| SECTION HOOK subcomponent dump routine |
| NULL ========================= |
| 1NOTE These data are reset every time a javacore is taken |
| 1HKINTERFACE MM_OMRHookInterface |
| NULL ------------------------------------------------------------------------ |
| 1HKINTERFACE MM_PrivateHookInterface |
| NULL ------------------------------------------------------------------------ |
| 1HKINTERFACE MM_HookInterface |
| NULL ------------------------------------------------------------------------ |
| 1HKINTERFACE J9VMHookInterface |
| NULL ------------------------------------------------------------------------ |
| 2HKEVENTID 1 |
| 3HKCALLCOUNT 1239 |
| 3HKTOTALTIME 219564us |
| 3HKLAST Last Callback |
| 4HKCALLSITE trcengine.c:395 |
| 4HKSTARTTIME Start Time: 2019-10-18T00:15:14.664 |
| 4HKDURATION Duration : 16us |
| 3HKLONGST Longest Callback |
| 4HKCALLSITE trcengine.c:395 |
| 4HKSTARTTIME Start Time: 2019-10-18T21:28:34.895 |
| 4HKDURATION Duration : 5012us |
| NULL |
| ... |
| 1HKINTERFACE J9VMZipCachePoolHookInterface |
| NULL ------------------------------------------------------------------------ |
| 1HKINTERFACE J9JITHookInterface |
| NULL ------------------------------------------------------------------------ |
| 2HKEVENTID 3 |
| 3HKCALLCOUNT 3113 |
| 3HKTOTALTIME 4904us |
| 3HKLAST Last Callback |
| 4HKCALLSITE common/mgmtinit.c:193 |
| 4HKSTARTTIME Start Time: 2019-10-18T16:04:15.320 |
| 4HKDURATION Duration : 3us |
| 3HKLONGST Longest Callback |
| 4HKCALLSITE common/mgmtinit.c:193 |
| 4HKSTARTTIME Start Time: 2019-10-18T16:37:17.633 |
| 4HKDURATION Duration : 27us |
| NULL |
| ... |
| </code></pre> |
| |
| <h3 id="shared-classes">SHARED CLASSES</h3> |
| <p>If the shared classes cache is enabled at run time, the information provided in a Java dump file describes settings that were used when creating the cache, together with summary information about the size and content of the cache.</p> |
| <p>In the following example, the shared classes cache was created with a Class Debug Area (<code>-Xnolinenumbers=false</code>). Byte code instrumentation (BCI) is enabled, which is the default, and VMs sharing the cache are allowed to store classpaths, which is also the default.</p> |
| <p>The <code>Cache Summary</code> shows a cache size (<code>2SCLTEXTCSZ</code>) of 16776608 bytes, with a soft maximum size (<code>2SCLTEXTSMB</code>) also of 16776608 bytes, which leaves 12691668 bytes of free space (<code>2SCLTEXTFRB</code>). The size of the Class Debug Area (<code>2SCLTEXTDAS</code>) is 1331200 bytes and only 11% of this space is used.</p> |
| <p>In the <code>Cache Memory Status</code> subsection, the line <code>2SCLTEXTCMDT</code> indicates the name and location of the shared cache and <code>cr</code> indicates that the cache is a 64-bit compressed references cache.</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION SHARED CLASSES subcomponent dump routine |
| NULL ======================================== |
| NULL |
| 1SCLTEXTCRTW Cache Created With |
| NULL ------------------ |
| NULL |
| 2SCLTEXTXNL -Xnolinenumbers = false |
| 2SCLTEXTBCI BCI Enabled = true |
| 2SCLTEXTBCI Restrict Classpaths = false |
| NULL |
| 1SCLTEXTCSUM Cache Summary |
| NULL ------------------ |
| NULL |
| 2SCLTEXTNLC No line number content = false |
| 2SCLTEXTLNC Line number content = true |
| NULL |
| 2SCLTEXTRCS ROMClass start address = 0x00007F423061C000 |
| 2SCLTEXTRCE ROMClass end address = 0x00007F42307B9A28 |
| 2SCLTEXTMSA Metadata start address = 0x00007F42313D42FC |
| 2SCLTEXTCEA Cache end address = 0x00007F4231600000 |
| 2SCLTEXTRTF Runtime flags = 0x00102001ECA6028B |
| 2SCLTEXTCGN Cache generation = 35 |
| NULL |
| 2SCLTEXTCSZ Cache size = 16776608 |
| 2SCLTEXTSMB Softmx bytes = 16776608 |
| 2SCLTEXTFRB Free bytes = 12691668 |
| 2SCLTEXTRCB ROMClass bytes = 1694248 |
| 2SCLTEXTAOB AOT code bytes = 0 |
| 2SCLTEXTADB AOT data bytes = 0 |
| 2SCLTEXTAHB AOT class hierarchy bytes = 32 |
| 2SCLTEXTATB AOT thunk bytes = 0 |
| 2SCLTEXTARB Reserved space for AOT bytes = -1 |
| 2SCLTEXTAMB Maximum space for AOT bytes = -1 |
| 2SCLTEXTJHB JIT hint bytes = 308 |
| 2SCLTEXTJPB JIT profile bytes = 2296 |
| 2SCLTEXTJRB Reserved space for JIT data bytes = -1 |
| 2SCLTEXTJMB Maximum space for JIT data bytes = -1 |
| 2SCLTEXTNOB Java Object bytes = 0 |
| 2SCLTEXTZCB Zip cache bytes = 919328 |
| 2SCLTEXTSHB Startup hint bytes = 0 |
| 2SCLTEXTRWB ReadWrite bytes = 114080 |
| 2SCLTEXTJCB JCL data bytes = 0 |
| 2SCLTEXTBDA Byte data bytes = 0 |
| 2SCLTEXTMDA Metadata bytes = 23448 |
| 2SCLTEXTDAS Class debug area size = 1331200 |
| 2SCLTEXTDAU Class debug area % used = 11% |
| 2SCLTEXTDAN Class LineNumberTable bytes = 156240 |
| 2SCLTEXTDAV Class LocalVariableTable bytes = 0 |
| NULL |
| 2SCLTEXTNRC Number ROMClasses = 595 |
| 2SCLTEXTNAM Number AOT Methods = 0 |
| 2SCLTEXTNAD Number AOT Data Entries = 0 |
| 2SCLTEXTNAH Number AOT Class Hierarchy = 1 |
| 2SCLTEXTNAT Number AOT Thunks = 0 |
| 2SCLTEXTNJH Number JIT Hints = 14 |
| 2SCLTEXTNJP Number JIT Profiles = 20 |
| 2SCLTEXTNCP Number Classpaths = 1 |
| 2SCLTEXTNUR Number URLs = 0 |
| 2SCLTEXTNTK Number Tokens = 0 |
| 2SCLTEXTNOJ Number Java Objects = 0 |
| 2SCLTEXTNZC Number Zip Caches = 5 |
| 2SCLTEXTNSH Number Startup Hint Entries = 0 |
| 2SCLTEXTNJC Number JCL Entries = 0 |
| 2SCLTEXTNST Number Stale classes = 0 |
| 2SCLTEXTPST Percent Stale classes = 0% |
| NULL |
| 2SCLTEXTCPF Cache is 24% full |
| NULL |
| 1SCLTEXTCMST Cache Memory Status |
| NULL ------------------ |
| 1SCLTEXTCNTD Cache Name Feature Memory type Cache path |
| NULL |
| 2SCLTEXTCMDT sharedcc_doc-javacore CR Memory mapped file /tmp/javasharedresources/C290M4F1A64P_sharedcc_doc-javacore_G35 |
| NULL |
| 1SCLTEXTCMST Cache Lock Status |
| NULL ------------------ |
| 1SCLTEXTCNTD Lock Name Lock type TID owning lock |
| NULL |
| 2SCLTEXTCWRL Cache write lock File lock Unowned |
| 2SCLTEXTCRWL Cache read/write lock File lock Unowned |
| NULL |
| </code></pre> |
| |
| <p>The following example shows information for a layered cache:</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION SHARED CLASSES subcomponent dump routine |
| NULL ======================================== |
| NULL |
| 1SCLTEXTCSTL Cache Statistics for Top Layer |
| NULL |
| 1SCLTEXTCRTW Cache Created With |
| NULL ------------------ |
| NULL |
| 2SCLTEXTXNL -Xnolinenumbers = false |
| 2SCLTEXTBCI BCI Enabled = true |
| 2SCLTEXTBCI Restrict Classpaths = false |
| NULL |
| 1SCLTEXTCSUM Cache Summary |
| NULL ------------------ |
| NULL |
| 2SCLTEXTNLC No line number content = false |
| 2SCLTEXTLNC Line number content = false |
| NULL |
| 2SCLTEXTRCS ROMClass start address = 0x00007F0EDB567000 |
| 2SCLTEXTRCE ROMClass end address = 0x00007F0EDB567000 |
| 2SCLTEXTMSA Metadata start address = 0x00007F0EDC40241C |
| 2SCLTEXTCEA Cache end address = 0x00007F0EDC54B000 |
| 2SCLTEXTRTF Runtime flags = 0x80102001ECA602BB |
| 2SCLTEXTCGN Cache generation = 41 |
| 2SCLTEXTCLY Cache layer = 1 |
| NULL |
| 2SCLTEXTCSZ Cache size = 16776608 |
| 2SCLTEXTSMB Softmx bytes = 16776608 |
| 2SCLTEXTFRB Free bytes = 15315996 |
| 2SCLTEXTARB Reserved space for AOT bytes = -1 |
| 2SCLTEXTAMB Maximum space for AOT bytes = -1 |
| 2SCLTEXTJRB Reserved space for JIT data bytes = -1 |
| 2SCLTEXTJMB Maximum space for JIT data bytes = -1 |
| 2SCLTEXTRWB ReadWrite bytes = 114080 |
| 2SCLTEXTDAS Class debug area size = 1331200 |
| 2SCLTEXTDAU Class debug area % used = 0% |
| 2SCLTEXTDAN Class LineNumberTable bytes = 0 |
| 2SCLTEXTDAV Class LocalVariableTable bytes = 0 |
| NULL |
| 2SCLTEXTCPF Cache is 8% full |
| NULL |
| 1SCLTEXTCMST Cache Memory Status |
| NULL ------------------ |
| 1SCLTEXTCNTD Cache Name Feature Memory type Cache path |
| NULL |
| 2SCLTEXTCMDT Cache1 CR Memory mapped file /tmp/javasharedresources/C290M4F1A64P_Cache1_G41L01 |
| NULL |
| 1SCLTEXTCMST Cache Lock Status |
| NULL ------------------ |
| 1SCLTEXTCNTD Lock Name Lock type TID owning lock |
| NULL |
| 2SCLTEXTCWRL Cache write lock File lock Unowned |
| 2SCLTEXTCRWL Cache read/write lock File lock Unowned |
| NULL |
| 1SCLTEXTCSAL Cache Statistics for All Layers |
| NULL |
| 2SCLTEXTRCB ROMClass bytes = 1459040 |
| 2SCLTEXTAOB AOT code bytes = 57624 |
| 2SCLTEXTADB AOT data bytes = 272 |
| 2SCLTEXTAHB AOT class hierarchy bytes = 1840 |
| 2SCLTEXTATB AOT thunk bytes = 632 |
| 2SCLTEXTJHB JIT hint bytes = 484 |
| 2SCLTEXTJPB JIT profile bytes = 0 |
| 2SCLTEXTNOB Java Object bytes = 0 |
| 2SCLTEXTZCB Zip cache bytes = 1134016 |
| 2SCLTEXTSHB Startup hint bytes = 0 |
| 2SCLTEXTJCB JCL data bytes = 0 |
| 2SCLTEXTBDA Byte data bytes = 0 |
| NULL |
| 2SCLTEXTNRC Number ROMClasses = 503 |
| 2SCLTEXTNAM Number AOT Methods = 16 |
| 2SCLTEXTNAD Number AOT Data Entries = 1 |
| 2SCLTEXTNAH Number AOT Class Hierarchy = 28 |
| 2SCLTEXTNAT Number AOT Thunks = 11 |
| 2SCLTEXTNJH Number JIT Hints = 15 |
| 2SCLTEXTNJP Number JIT Profiles = 0 |
| 2SCLTEXTNCP Number Classpaths = 1 |
| 2SCLTEXTNUR Number URLs = 0 |
| 2SCLTEXTNTK Number Tokens = 0 |
| 2SCLTEXTNOJ Number Java Objects = 0 |
| 2SCLTEXTNZC Number Zip Caches = 21 |
| 2SCLTEXTNSH Number Startup Hint Entries = 0 |
| 2SCLTEXTNJC Number JCL Entries = 0 |
| 2SCLTEXTNST Number Stale classes = 0 |
| 2SCLTEXTPST Percent Stale classes = 0% |
| </code></pre> |
| |
| <h3 id="classes">CLASSES</h3> |
| <p>The classes section shows information about class loaders. The first part is a summary that records each available class loader (<code>2CLTEXTCLLOADER</code>) followed by the number of libraries and classes that it loaded. This information is followed by a more detailed list of libraries (<code>1CLTEXTCLLIB</code>) and classes (<code>1CLTEXTCLLO</code>) that are loaded.</p> |
| <p>In the example you can see that the <code>java/lang/InternalAnonymousClassLoader</code> loaded 2 classes, <code>jdk/internal/loader/BuiltinClassLoader$$Lambda$2/00000000F03876A0(0x0000000001030F00)</code> and <code>jdk/internal/loader/BuiltinClassLoader$$Lambda$1/00000000F00D2460(0x0000000001018A00)</code>.</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION CLASSES subcomponent dump routine |
| NULL ================================= |
| 1CLTEXTCLLOS Classloader summaries |
| 1CLTEXTCLLSS 12345678: 1=primordial,2=extension,3=shareable,4=middleware,5=system,6=trusted,7=application,8=delegating |
| 2CLTEXTCLLOADER p---st-- Loader *System*(0x00000000FFE1D258) |
| 3CLNMBRLOADEDLIB Number of loaded libraries 5 |
| 3CLNMBRLOADEDCL Number of loaded classes 638 |
| 2CLTEXTCLLOADER -x--st-- Loader jdk/internal/loader/ClassLoaders$PlatformClassLoader(0x00000000FFE1D4F0), Parent *none*(0x0000000000000000) |
| 3CLNMBRLOADEDLIB Number of loaded libraries 0 |
| 3CLNMBRLOADEDCL Number of loaded classes 0 |
| 2CLTEXTCLLOADER ----st-- Loader java/lang/InternalAnonymousClassLoader(0x00000000FFE1DFD0), Parent *none*(0x0000000000000000) |
| 3CLNMBRLOADEDLIB Number of loaded libraries 0 |
| 3CLNMBRLOADEDCL Number of loaded classes 2 |
| 2CLTEXTCLLOADER -----ta- Loader jdk/internal/loader/ClassLoaders$AppClassLoader(0x00000000FFE1DAD0), Parent jdk/internal/loader/ClassLoaders$PlatformClassLoader(0x00000000FFE1D4F0) |
| 3CLNMBRLOADEDLIB Number of loaded libraries 0 |
| 3CLNMBRLOADEDCL Number of loaded classes 0 |
| 1CLTEXTCLLIB ClassLoader loaded libraries |
| 2CLTEXTCLLIB Loader *System*(0x00000000FFE1D258) |
| 3CLTEXTLIB /home/me/openj9-openjdk-jdk9/build/linux-x86_64-normal-server-release/images/jdk/lib/compressedrefs/jclse9_29 |
| 3CLTEXTLIB /home/me/openj9-openjdk-jdk9/build/linux-x86_64-normal-server-release/images/jdk/lib/java |
| 3CLTEXTLIB /home/me/openj9-openjdk-jdk9/build/linux-x86_64-normal-server-release/images/jdk/lib/compressedrefs/j9jit29 |
| 3CLTEXTLIB /home/me/openj9-openjdk-jdk9/build/linux-x86_64-normal-server-release/images/jdk/lib/zip |
| 3CLTEXTLIB /home/me/openj9-openjdk-jdk9/build/linux-x86_64-normal-server-release/images/jdk/lib/nio |
| 1CLTEXTCLLOD ClassLoader loaded classes |
| 2CLTEXTCLLOAD Loader *System*(0x00000000FFE1D258) |
| 3CLTEXTCLASS [Ljava/lang/Thread$State;(0x0000000001056400) |
| ... |
| 2CLTEXTCLLOAD Loader jdk/internal/loader/ClassLoaders$PlatformClassLoader(0x00000000FFE1D4F0) |
| 2CLTEXTCLLOAD Loader java/lang/InternalAnonymousClassLoader(0x00000000FFE1DFD0) |
| 3CLTEXTCLASS jdk/internal/loader/BuiltinClassLoader$$Lambda$2/00000000F03876A0(0x0000000001030F00) |
| 3CLTEXTCLASS jdk/internal/loader/BuiltinClassLoader$$Lambda$1/00000000F00D2460(0x0000000001018A00) |
| 2CLTEXTCLLOAD Loader jdk/internal/loader/ClassLoaders$AppClassLoader(0x00000000FFE1DAD0) |
| </code></pre> |
| |
| <h2 id="scenarios">Scenarios</h2> |
| <h3 id="general-protection-fault">General Protection Fault</h3> |
| <p>In this scenario, a Java application has crashed due to a General Protection Fault (GPF), automatically generating a Java dump file.</p> |
| <p>The first section of the file (TITLE) tells you that the GPF triggered the Java dump.</p> |
| <pre><code>0SECTION TITLE subcomponent dump routine |
| NULL =============================== |
| 1TICHARSET UTF-8 |
| 1TISIGINFO Dump Event "gpf" (00002000) received |
| 1TIDATETIME Date: 2018/09/24 at 15:18:03:115 |
| 1TINANOTIME System nanotime: 4498949283020796 |
| 1TIFILENAME Javacore filename: /home/test/JNICrasher/javacore.20180924.151801.29399.0002.txt |
| 1TIREQFLAGS Request Flags: 0x81 (exclusive+preempt) |
| 1TIPREPSTATE Prep State: 0x100 (trace_disabled) |
| 1TIPREPINFO Exclusive VM access not taken: data may not be consistent across javacore sections |
| </code></pre> |
| |
| <p>To troubleshoot this problem, you need to know which thread caused the GPF to occur. The thread that was running at the time of the crash is reported as the <strong>current thread</strong> |
| in the THREADS section of the Java dump. Here is an extract from the THREADS section:</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION THREADS subcomponent dump routine |
| NULL ================================= |
| NULL |
| 1XMPOOLINFO JVM Thread pool info: |
| 2XMPOOLTOTAL Current total number of pooled threads: 16 |
| 2XMPOOLLIVE Current total number of live threads: 15 |
| 2XMPOOLDAEMON Current total number of live daemon threads: 14 |
| NULL |
| 1XMCURTHDINFO Current thread |
| 3XMTHREADINFO "main" J9VMThread:0xB6B60E00, omrthread_t:0xB6B049D8, java/lang/Thread:0xB55444D0, state:R, prio=5 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0x1, isDaemon:false) |
| 3XMTHREADINFO1 (native thread ID:0x72D8, native priority:0x5, native policy:UNKNOWN, vmstate:R, vm thread flags:0x00000000) |
| 3XMTHREADINFO2 (native stack address range from:0xB6CE3000, to:0xB74E4000, size:0x801000) |
| 3XMCPUTIME CPU usage total: 0.319865924 secs, current category="Application" |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=778008 (0xBDF18) |
| 3XMTHREADINFO3 Java callstack: |
| 4XESTACKTRACE at JNICrasher.doSomethingThatCrashes(Native Method) |
| 4XESTACKTRACE at JNICrasher.main(JNICrasher.java:7) |
| 3XMTHREADINFO3 Native callstack: |
| 4XENATIVESTACK (0xB6C6F663 [libj9prt29.so+0x3b663]) |
| 4XENATIVESTACK (0xB6C52F6E [libj9prt29.so+0x1ef6e]) |
| 4XENATIVESTACK (0xB6C6F1CE [libj9prt29.so+0x3b1ce]) |
| 4XENATIVESTACK (0xB6C6F2C6 [libj9prt29.so+0x3b2c6]) |
| 4XENATIVESTACK (0xB6C6ED93 [libj9prt29.so+0x3ad93]) |
| 4XENATIVESTACK (0xB6C52F6E [libj9prt29.so+0x1ef6e]) |
| 4XENATIVESTACK (0xB6C6ED07 [libj9prt29.so+0x3ad07]) |
| 4XENATIVESTACK (0xB6C6AA3D [libj9prt29.so+0x36a3d]) |
| 4XENATIVESTACK (0xB6C6C3A4 [libj9prt29.so+0x383a4]) |
| 4XENATIVESTACK (0xB667FA19 [libj9dmp29.so+0xfa19]) |
| 4XENATIVESTACK (0xB6C52F6E [libj9prt29.so+0x1ef6e]) |
| 4XENATIVESTACK (0xB66878CF [libj9dmp29.so+0x178cf]) |
| 4XENATIVESTACK (0xB6688083 [libj9dmp29.so+0x18083]) |
| 4XENATIVESTACK (0xB6C52F6E [libj9prt29.so+0x1ef6e]) |
| 4XENATIVESTACK (0xB6680C0D [libj9dmp29.so+0x10c0d]) |
| 4XENATIVESTACK (0xB667F9D7 [libj9dmp29.so+0xf9d7]) |
| 4XENATIVESTACK (0xB6C52F6E [libj9prt29.so+0x1ef6e]) |
| 4XENATIVESTACK (0xB668B02F [libj9dmp29.so+0x1b02f]) |
| 4XENATIVESTACK (0xB668B4D3 [libj9dmp29.so+0x1b4d3]) |
| 4XENATIVESTACK (0xB66740F1 [libj9dmp29.so+0x40f1]) |
| 4XENATIVESTACK (0xB66726FA [libj9dmp29.so+0x26fa]) |
| 4XENATIVESTACK (0xB6C52F6E [libj9prt29.so+0x1ef6e]) |
| 4XENATIVESTACK (0xB66726A9 [libj9dmp29.so+0x26a9]) |
| 4XENATIVESTACK (0xB6676AE4 [libj9dmp29.so+0x6ae4]) |
| 4XENATIVESTACK (0xB668D75A [libj9dmp29.so+0x1d75a]) |
| 4XENATIVESTACK (0xB6A28DD4 [libj9vm29.so+0x81dd4]) |
| 4XENATIVESTACK (0xB6C52F6E [libj9prt29.so+0x1ef6e]) |
| 4XENATIVESTACK (0xB6A289EE [libj9vm29.so+0x819ee]) |
| 4XENATIVESTACK (0xB6A29A40 [libj9vm29.so+0x82a40]) |
| 4XENATIVESTACK (0xB6C52B6A [libj9prt29.so+0x1eb6a]) |
| 4XENATIVESTACK __kernel_rt_sigreturn+0x0 (0xB7747410) |
| 4XENATIVESTACK (0xB75330B6 [libffi29.so+0x50b6]) |
| 4XENATIVESTACK ffi_raw_call+0xad (0xB7531C53 [libffi29.so+0x3c53]) |
| 4XENATIVESTACK (0xB69BE4AB [libj9vm29.so+0x174ab]) |
| 4XENATIVESTACK (0xB6A665BC [libj9vm29.so+0xbf5bc]) |
| 4XENATIVESTACK (0xB6A15552 [libj9vm29.so+0x6e552]) |
| 4XENATIVESTACK (0xB6A30894 [libj9vm29.so+0x89894]) |
| 4XENATIVESTACK (0xB6A6F169 [libj9vm29.so+0xc8169]) |
| 4XENATIVESTACK (0xB6C52F6E [libj9prt29.so+0x1ef6e]) |
| 4XENATIVESTACK (0xB6A6F1FA [libj9vm29.so+0xc81fa]) |
| 4XENATIVESTACK (0xB6A30994 [libj9vm29.so+0x89994]) |
| 4XENATIVESTACK (0xB6A2CE4C [libj9vm29.so+0x85e4c]) |
| 4XENATIVESTACK (0xB770487D [libjli.so+0x787d]) |
| 4XENATIVESTACK (0xB7719F72 [libpthread.so.0+0x6f72]) |
| 4XENATIVESTACK clone+0x5e (0xB763543E [libc.so.6+0xee43e]) |
| </code></pre> |
| |
| <p>The extract tells you that the current thread was <code>java/lang/Thread</code>, and information is provided about the Java callstack and native callstack |
| (<code>3XMTHREADINFO3</code>) at the point at which the crash occurred. To simulate a crash caused by a bug in an application, this example |
| calls a JNI method whose native implementation causes a crash. The Java callstack shows the call to the JNI native method (<code>JNIcrasher</code>), and the |
| native callstack shows the point of failure. In this example, the native call stack does not include any function names to help you isolate the error |
| in the native code. You can get this information from a system dump, which is usually produced alongside the Java dump. Open the |
| system dump with the <a href="../tool_jdmpview/">Dump viewer</a> and use the <code>info thread</code> command to print the Java and native stack for the current thread.</p> |
| <h3 id="java-outofmemoryerror">Java OutOfMemoryError</h3> |
| <p>In this scenario, the Java heap runs out of memory, causing an <code>OutOfMemoryError</code>, which automatically generates a Java dump file.</p> |
| <p>The first section of the file (TITLE) tells you that a <code>systhrow</code> event triggered the Java dump as a result of an OOM (<code>java/lang/OutOfMemoryError</code>) for |
| Java heap space.</p> |
| <pre><code>0SECTION TITLE subcomponent dump routine |
| NULL =============================== |
| 1TICHARSET UTF-8 |
| 1TISIGINFO Dump Event "systhrow" (00040000) Detail "java/lang/OutOfMemoryError" "Java heap space" received |
| 1TIDATETIME Date: 2018/09/14 at 15:29:42:709 |
| 1TINANOTIME System nanotime: 3635648876608448 |
| 1TIFILENAME Javacore filename: /home/cheesemp/test/javacore.20180914.152929.18885.0003.txt |
| 1TIREQFLAGS Request Flags: 0x81 (exclusive+preempt) |
| 1TIPREPSTATE Prep State: 0x104 (exclusive_vm_access+trace_disabled) |
| </code></pre> |
| |
| <p>The MEMINFO section records how much memory is allocated to the Java heap (<code>1STHEAPTYPE Object Memory</code>), how much is in use, and how much is free. Solving |
| your problem might be as simple as setting a larger heap size when you start your application.</p> |
| <p>If you don't know what size the Java heap was set to, you might find that information in the ENVINFO section, which records the command line options that |
| were used when the application started. Look or search for the <code>1CIUSERARGS UserArgs:</code> string and review the entries recorded for all lines that |
| start <code>2CIUSERARG</code>. The Java heap size is set by the <code>-Xmx</code> option. If the size has not been set on the command line by <code>-Xmx</code>, the default value applies, which |
| you can find in <a href="../openj9_defaults/">Default Settings</a>.</p> |
| <p>In this scenario the solution to the problem is not an adjustment to the Java heap size. Here is the MEMINFO section:</p> |
| <pre><code>0SECTION MEMINFO subcomponent dump routine |
| NULL ================================= |
| NULL |
| 1STHEAPTYPE Object Memory |
| NULL id start end size space/region |
| 1STHEAPSPACE 0xB6B49D20 -- -- -- Generational |
| 1STHEAPREGION 0xB6B4A078 0x95750000 0xB5470000 0x1FD20000 Generational/Tenured Region |
| 1STHEAPREGION 0xB6B49F10 0xB5470000 0xB54C0000 0x00050000 Generational/Nursery Region |
| 1STHEAPREGION 0xB6B49DA8 0xB54C0000 0xB5750000 0x00290000 Generational/Nursery Region |
| NULL |
| 1STHEAPTOTAL Total memory: 536870912 (0x20000000) |
| 1STHEAPINUSE Total memory in use: 302603160 (0x12095B98) |
| 1STHEAPFREE Total memory free: 234267752 (0x0DF6A468) |
| </code></pre> |
| |
| <p>The output shows that only 56% of the Java heap is in use, so this suggests that the application is trying to do something sub-optimal. To |
| investigate further you need to work out which thread was the current thread when the OOM occurred to see what it was trying to do. As in the previous scenario, you can find the |
| <strong>current thread</strong> in the THREADS section. Here is an extract from the output:</p> |
| <pre><code>0SECTION THREADS subcomponent dump routine |
| NULL ================================= |
| NULL |
| 1XMPOOLINFO JVM Thread pool info: |
| 2XMPOOLTOTAL Current total number of pooled threads: 16 |
| 2XMPOOLLIVE Current total number of live threads: 16 |
| 2XMPOOLDAEMON Current total number of live daemon threads: 15 |
| NULL |
| 1XMCURTHDINFO Current thread |
| 3XMTHREADINFO "main" J9VMThread:0xB6B60C00, omrthread_t:0xB6B049D8, java/lang/Thread:0x95764520, state:R, prio=5 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0x1, isDaemon:false) |
| 3XMTHREADINFO1 (native thread ID:0x49C6, native priority:0x5, native policy:UNKNOWN, vmstate:R, vm thread flags:0x00001020) |
| 3XMTHREADINFO2 (native stack address range from:0xB6CB5000, to:0xB74B6000, size:0x801000) |
| 3XMCPUTIME CPU usage total: 8.537823831 secs, current category="Application" |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 Java callstack: |
| 4XESTACKTRACE at java/lang/StringBuffer.ensureCapacityImpl(StringBuffer.java:696) |
| 4XESTACKTRACE at java/lang/StringBuffer.append(StringBuffer.java:486(Compiled Code)) |
| 5XESTACKTRACE (entered lock: java/lang/StringBuffer@0x957645B8, entry count: 1) |
| 4XESTACKTRACE at java/lang/StringBuffer.append(StringBuffer.java:428(Compiled Code)) |
| 4XESTACKTRACE at HeapBreaker.main(HeapBreaker.java:34(Compiled Code)) |
| 3XMTHREADINFO3 Native callstack: |
| 4XENATIVESTACK (0xB6C535B3 [libj9prt29.so+0x3b5b3]) |
| 4XENATIVESTACK (0xB6C36F3E [libj9prt29.so+0x1ef3e]) |
| 4XENATIVESTACK (0xB6C5311E [libj9prt29.so+0x3b11e]) |
| 4XENATIVESTACK (0xB6C53216 [libj9prt29.so+0x3b216]) |
| 4XENATIVESTACK (0xB6C52CE3 [libj9prt29.so+0x3ace3]) |
| 4XENATIVESTACK (0xB6C36F3E [libj9prt29.so+0x1ef3e]) |
| 4XENATIVESTACK (0xB6C52C57 [libj9prt29.so+0x3ac57]) |
| 4XENATIVESTACK (0xB6C4E9CD [libj9prt29.so+0x369cd]) |
| 4XENATIVESTACK (0xB6C502FA [libj9prt29.so+0x382fa]) |
| </code></pre> |
| |
| <p>To simulate a Java <code>OutOfMemoryError</code>, this example application repeatedly appends characters to a <code>StringBuffer</code> object in an infinite loop. The Java callstack shows the <code>HeapBreaker.main</code> method appending characters (<code>java/lang/StringGuffer.append</code>) until the method <code>java/lang/StringBuffer.ensureCapacityImpl()</code> throws the <code>OutOfMemoryError</code>.</p> |
| <p>StringBuffer objects are wrappers for character arrays (<code>char[]</code>) and when the capacity of the underlying array is reached, the contents are automatically copied into a new, larger array. The new array is created in the <code>StringBuffer.ensureCapacity()</code> method, which more or less doubles the size of the old array. In this scenario, the array takes up all the remaining space in the Java heap.</p> |
| <p>The MEMINFO section of the Java dump file can also tell you when an unexpectedly large allocation request causes an OOM. Look for the GC History (<code>1STGCHTYPE</code>) section, which details allocation requests that trigger GC activity. In the sample output you can see that a large allocation request (<code>requestedbytes=603979784</code>) triggered a global GC. When the GC could not free up sufficient space in the heap to satisfy the request, the allocation failure generated the OOM.</p> |
| <pre><code>1STGCHTYPE GC History |
| 3STHSTTYPE 14:29:29:580239000 GMT j9mm.101 - J9AllocateIndexableObject() returning NULL! 0 bytes requested for object of class B6BBC300 from memory space 'Generational' id=B6B49D20 |
| 3STHSTTYPE 14:29:29:579916000 GMT j9mm.134 - Allocation failure end: newspace=2686912/3014656 oldspace=231597224/533856256 loa=5338112/5338112 |
| 3STHSTTYPE 14:29:29:579905000 GMT j9mm.470 - Allocation failure cycle end: newspace=2686912/3014656 oldspace=231597224/533856256 loa=5338112/5338112 |
| 3STHSTTYPE 14:29:29:579859000 GMT j9mm.475 - GlobalGC end: workstackoverflow=0 overflowcount=0 memory=234284136/536870912 |
| 3STHSTTYPE 14:29:29:579807000 GMT j9mm.90 - GlobalGC collect complete |
| 3STHSTTYPE 14:29:29:579776000 GMT j9mm.137 - Compact end: bytesmoved=301989896 |
| 3STHSTTYPE 14:29:29:313899000 GMT j9mm.136 - Compact start: reason=compact to meet allocation |
| 3STHSTTYPE 14:29:29:313555000 GMT j9mm.57 - Sweep end |
| 3STHSTTYPE 14:29:29:310772000 GMT j9mm.56 - Sweep start |
| 3STHSTTYPE 14:29:29:310765000 GMT j9mm.94 - Class unloading end: classloadersunloaded=0 classesunloaded=0 |
| 3STHSTTYPE 14:29:29:310753000 GMT j9mm.60 - Class unloading start |
| 3STHSTTYPE 14:29:29:310750000 GMT j9mm.55 - Mark end |
| 3STHSTTYPE 14:29:29:306013000 GMT j9mm.54 - Mark start |
| 3STHSTTYPE 14:29:29:305957000 GMT j9mm.474 - GlobalGC start: globalcount=9 |
| 3STHSTTYPE 14:29:29:305888000 GMT j9mm.475 - GlobalGC end: workstackoverflow=0 overflowcount=0 memory=234284136/536870912 |
| 3STHSTTYPE 14:29:29:305837000 GMT j9mm.90 - GlobalGC collect complete |
| 3STHSTTYPE 14:29:29:305808000 GMT j9mm.137 - Compact end: bytesmoved=189784 |
| 3STHSTTYPE 14:29:29:298042000 GMT j9mm.136 - Compact start: reason=compact to meet allocation |
| 3STHSTTYPE 14:29:29:297695000 GMT j9mm.57 - Sweep end |
| 3STHSTTYPE 14:29:29:291696000 GMT j9mm.56 - Sweep start |
| 3STHSTTYPE 14:29:29:291692000 GMT j9mm.55 - Mark end |
| 3STHSTTYPE 14:29:29:284994000 GMT j9mm.54 - Mark start |
| 3STHSTTYPE 14:29:29:284941000 GMT j9mm.474 - GlobalGC start: globalcount=8 |
| 3STHSTTYPE 14:29:29:284916000 GMT j9mm.135 - Exclusive access: exclusiveaccessms=0.016 meanexclusiveaccessms=0.016 threads=0 lastthreadtid=0xB6B61100 beatenbyotherthread=0 |
| 3STHSTTYPE 14:29:29:284914000 GMT j9mm.469 - Allocation failure cycle start: newspace=2678784/3014656 oldspace=80601248/533856256 loa=5338112/5338112 requestedbytes=603979784 |
| 3STHSTTYPE 14:29:29:284893000 GMT j9mm.470 - Allocation failure cycle end: newspace=2678784/3014656 oldspace=80601248/533856256 loa=5338112/5338112 |
| 3STHSTTYPE 14:29:29:284858000 GMT j9mm.560 - LocalGC end: rememberedsetoverflow=0 causedrememberedsetoverflow=0 scancacheoverflow=0 failedflipcount=0 failedflipbytes=0 failedtenurecount=0 failedtenurebytes=0 flipcount=2 flipbytes=64 newspace=2678784/3014656 oldspace=80601248/533856256 loa=5338112/5338112 tenureage=0 |
| 3STHSTTYPE 14:29:29:284140000 GMT j9mm.140 - Tilt ratio: 89 |
| 3STHSTTYPE 14:29:29:283160000 GMT j9mm.64 - LocalGC start: globalcount=8 scavengecount=335 weakrefs=0 soft=0 phantom=0 finalizers=0 |
| 3STHSTTYPE 14:29:29:283123000 GMT j9mm.135 - Exclusive access: exclusiveaccessms=0.016 meanexclusiveaccessms=0.016 threads=0 lastthreadtid=0xB6B61100 beatenbyotherthread=0 |
| 3STHSTTYPE 14:29:29:283120000 GMT j9mm.469 - Allocation failure cycle start: newspace=753616/3014656 oldspace=80601248/533856256 loa=5338112/5338112 requestedbytes=603979784 |
| 3STHSTTYPE 14:29:29:283117000 GMT j9mm.133 - Allocation failure start: newspace=753616/3014656 oldspace=80601248/533856256 loa=5338112/5338112 requestedbytes=603979784 |
| 3STHSTTYPE 14:29:29:269762000 GMT j9mm.134 - Allocation failure end: newspace=2686928/3014656 oldspace=80601248/533856256 loa=5338112/5338112 |
| 3STHSTTYPE 14:29:29:269751000 GMT j9mm.470 - Allocation failure cycle end: newspace=2686976/3014656 oldspace=80601248/533856256 loa=5338112/5338112 |
| 3STHSTTYPE 14:29:29:269718000 GMT j9mm.560 - LocalGC end: rememberedsetoverflow=0 causedrememberedsetoverflow=0 scancacheoverflow=0 failedflipcount=0 failedflipbytes=0 failedtenurecount=0 failedtenurebytes=0 flipcount=0 flipbytes=0 newspace=2686976/3014656 oldspace=80601248/533856256 loa=5338112/5338112 tenureage=0 |
| 3STHSTTYPE 14:29:29:268981000 GMT j9mm.140 - Tilt ratio: 89 |
| 3STHSTTYPE 14:29:29:268007000 GMT j9mm.64 - LocalGC start: globalcount=8 scavengecount=334 weakrefs=0 soft=0 phantom=0 finalizers=0 |
| 3STHSTTYPE 14:29:29:267969000 GMT j9mm.135 - Exclusive access: exclusiveaccessms=0.016 meanexclusiveaccessms=0.016 threads=0 lastthreadtid=0xB6B61100 beatenbyotherthread=0 |
| 3STHSTTYPE 14:29:29:267966000 GMT j9mm.469 - Allocation failure cycle start: newspace=0/3014656 oldspace=80601248/533856256 loa=5338112/5338112 requestedbytes=48 |
| 3STHSTTYPE 14:29:29:267963000 GMT j9mm.133 - Allocation failure start: newspace=0/3014656 oldspace=80601248/533856256 loa=5338112/5338112 requestedbytes=48 |
| 3STHSTTYPE 14:29:29:249015000 GMT j9mm.134 - Allocation failure end: newspace=2686928/3014656 oldspace=80601248/533856256 loa=5338112/5338112 |
| 3STHSTTYPE 14:29:29:249003000 GMT j9mm.470 - Allocation failure cycle end: newspace=2686976/3014656 oldspace=80601248/533856256 loa=5338112/5338112 |
| 3STHSTTYPE 14:29:29:248971000 GMT j9mm.560 - LocalGC end: rememberedsetoverflow=0 causedrememberedsetoverflow=0 scancacheoverflow=0 failedflipcount=0 failedflipbytes=0 failedtenurecount=0 failedtenurebytes=0 flipcount=0 flipbytes=0 newspace=2686976/3014656 oldspace=80601248/533856256 loa=5338112/5338112 tenureage=0 |
| </code></pre> |
| |
| <p>Although the Java code that was used in this scenario deliberately triggered an <code>OutOfMemoryError</code> in a pronounced way, similar allocation issues can and do occur when dealing with large data sets such as XML files.</p> |
| <p>The next step in diagnosing the problem is to open the system dump that gets generated automatically when an <code>OutOfMemoryError</code> occurs. Open |
| the dump with the <a href="https://www.eclipse.org/mat/">Eclipse Memory Analyzer tool (MAT)</a> and search for the <code>StringBuffer</code> object, which should provide further clues about what went wrong. A common example is seeing the same <code>String</code> duplicated over and over again, which might indicate that code is stuck in a loop.</p> |
| <p><span aria-hidden="true" class="twemoji note"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M497.9 142.1l-46.1 46.1c-4.7 4.7-12.3 4.7-17 0l-111-111c-4.7-4.7-4.7-12.3 0-17l46.1-46.1c18.7-18.7 49.1-18.7 67.9 0l60.1 60.1c18.8 18.7 18.8 49.1 0 67.9zM284.2 99.8L21.6 362.4.4 483.9c-2.9 16.4 11.4 30.6 27.8 27.8l121.5-21.3 262.6-262.6c4.7-4.7 4.7-12.3 0-17l-111-111c-4.8-4.7-12.4-4.7-17.1 0zM124.1 339.9c-5.5-5.5-5.5-14.3 0-19.8l154-154c5.5-5.5 14.3-5.5 19.8 0s5.5 14.3 0 19.8l-154 154c-5.5 5.5-14.3 5.5-19.8 0zM88 424h48v36.3l-64.5 11.3-31.1-31.1L51.7 376H88v48z"/></svg></span> <strong>Note:</strong> If you want to use MAT to analyze your system dump, you must install the Diagnostic Tool Framework for Java (DTFJ) plugin in the Eclipse IDE. Select the following menu items:</p> |
| <pre><code>Help > Install New Software > Work with "IBM Diagnostic Tool Framework for Java" > |
| </code></pre> |
| |
| <p>If, unlike the previous scenario, you receive an <code>OutOfMemoryError</code> and the MEMINFO section shows that there is very little space left |
| on the Java heap, the current thread information is typically not important. The current thread is simply the thread that happened to be current when the space ran out. In this situation you might want to increase your Java heap size. For help with this task, see <a href="https://www.ibm.com/support/knowledgecenter/SSYKE2_8.0.0/com.ibm.java.vm.80.doc/docs/mm_heapsizing.html">How to do heap sizing</a>.</p> |
| <h3 id="native-outofmemoryerror">Native OutOfMemoryError</h3> |
| <p>In this scenario, the VM runs out of native memory. Native memory is memory that is used by the VM for storing all virtualized resources and data that it needs for VM operations. Native memory that is available to the VM process is limited by the operating system. The native memory available to the VM might also be subject to additional limits imposed by the operating system, for example Unix <code>ulimits</code>. </p> |
| <p>When a <code>NativeOutOfMemoryError</code> occurs, a Java dump is generated by default. The first section of the file (TITLE) tells you that a systhrow event triggered the Java dump as a result of an OOM (<code>java/lang/OutOfMemoryError</code>) for native memory.</p> |
| <pre><code>0SECTION TITLE subcomponent dump routine |
| NULL =============================== |
| 1TICHARSET UTF-8 |
| 1TISIGINFO Dump Event "systhrow" (00040000) Detail "java/lang/OutOfMemoryError" "native memory exhausted" received |
| 1TIDATETIME Date: 2018/09/14 at 15:49:55:887 |
| 1TINANOTIME System nanotime: 3636862054495675 |
| 1TIFILENAME Javacore filename: /home/cheesemp/test/javacore.20180914.154814.19708.0003.txt |
| 1TIREQFLAGS Request Flags: 0x81 (exclusive+preempt) |
| 1TIPREPSTATE Prep State: 0x104 (exclusive_vm_access+trace_disabled) |
| </code></pre> |
| |
| <p>Sometimes, the current thread is responsible for causing the <code>NativeOutOfMemoryError</code>. Information about the current thread can be found in the THREADS section, as shown in the following output.</p> |
| <pre><code>0SECTION THREADS subcomponent dump routine |
| NULL ================================= |
| NULL |
| 1XMPOOLINFO JVM Thread pool info: |
| 2XMPOOLTOTAL Current total number of pooled threads: 16 |
| 2XMPOOLLIVE Current total number of live threads: 16 |
| 2XMPOOLDAEMON Current total number of live daemon threads: 15 |
| NULL |
| 1XMCURTHDINFO Current thread |
| 3XMTHREADINFO "main" J9VMThread:0xB6C60C00, omrthread_t:0xB6C049D8, java/lang/Thread:0xB55E3C10, state:R, prio=5 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0x1, isDaemon:false) |
| 3XMTHREADINFO1 (native thread ID:0x4CFD, native priority:0x5, native policy:UNKNOWN, vmstate:R, vm thread flags:0x00001020) |
| 3XMTHREADINFO2 (native stack address range from:0xB6D4E000, to:0xB754F000, size:0x801000) |
| 3XMCPUTIME CPU usage total: 3.654896026 secs, current category="Application" |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 Java callstack: |
| 4XESTACKTRACE at sun/misc/Unsafe.allocateDBBMemory(Native Method) |
| 4XESTACKTRACE at java/nio/DirectByteBuffer.<init>(DirectByteBuffer.java:127(Compiled Code)) |
| 4XESTACKTRACE at java/nio/ByteBuffer.allocateDirect(ByteBuffer.java:311) |
| 4XESTACKTRACE at NativeHeapBreaker.main(NativeHeapBreaker.java:9) |
| 3XMTHREADINFO3 Native callstack: |
| 4XENATIVESTACK (0xB6A9F5B3 [libj9prt29.so+0x3b5b3]) |
| ... |
| 4XENATIVESTACK (0xB582CC9C [libjclse7b_29.so+0x40c9c]) |
| 4XENATIVESTACK Java_sun_misc_Unsafe_allocateDBBMemory+0x88 (0xB5827F6B [libjclse7b_29.so+0x3bf6b]) |
| 4XENATIVESTACK (0x94A2084A [<unknown>+0x0]) |
| 4XENATIVESTACK (0xB6B2538B [libj9vm29.so+0x6c38b]) |
| 4XENATIVESTACK (0xB6B4074C [libj9vm29.so+0x8774c]) |
| 4XENATIVESTACK (0xB6B7F299 [libj9vm29.so+0xc6299]) |
| 4XENATIVESTACK (0xB6A82F3E [libj9prt29.so+0x1ef3e]) |
| 4XENATIVESTACK (0xB6B7F32A [libj9vm29.so+0xc632a]) |
| 4XENATIVESTACK (0xB6B4084C [libj9vm29.so+0x8784c]) |
| 4XENATIVESTACK (0xB6B3CD0C [libj9vm29.so+0x83d0c]) |
| 4XENATIVESTACK (0xB776F87D [libjli.so+0x787d]) |
| 4XENATIVESTACK (0xB7784F72 [libpthread.so.0+0x6f72]) |
| 4XENATIVESTACK clone+0x5e (0xB76A043E [libc.so.6+0xee43e]) |
| </code></pre> |
| |
| <p>For clarity in the <code>Native callstack</code> output, <code>...</code> indicates that some lines are removed.</p> |
| <p>The Java callstack shows the transition from Java to native code (<code>sun/misc/Unsafe.allocateDBBMemory(Native Method)</code>), indicating a request for Direct Byte Buffer (DBB) storage. DBB storage is backed by native memory, with the Java heap containing only a reference to the native heap buffer. In this scenario, DBB storage is the likely culprit for this <code>NativeOutOfMemoryError</code>.</p> |
| <p>The next step is to investigate the NATIVEMEMINFO section of the Java dump file, which reports the amount of memory used by the JRE process, broken down into component areas.</p> |
| <pre><code>0SECTION NATIVEMEMINFO subcomponent dump routine |
| NULL ================================= |
| 0MEMUSER |
| 1MEMUSER JRE: 3,166,386,688 bytes / 4388 allocations |
| 1MEMUSER | |
| 2MEMUSER +--VM: 563,176,824 bytes / 1518 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Classes: 3,104,416 bytes / 120 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Memory Manager (GC): 548,181,888 bytes / 398 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Java Heap: 536,932,352 bytes / 1 allocation |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Other: 11,249,536 bytes / 397 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Threads: 10,817,120 bytes / 147 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Java Stack: 115,584 bytes / 16 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Native Stack: 10,616,832 bytes / 17 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Other: 84,704 bytes / 114 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Trace: 163,688 bytes / 268 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--JVMTI: 17,320 bytes / 13 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--JNI: 23,296 bytes / 55 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Port Library: 8,576 bytes / 74 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Other: 860,520 bytes / 443 allocations |
| 1MEMUSER | |
| 2MEMUSER +--JIT: 3,744,728 bytes / 122 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--JIT Code Cache: 2,097,152 bytes / 1 allocation |
| 2MEMUSER | | |
| 3MEMUSER | +--JIT Data Cache: 524,336 bytes / 1 allocation |
| 2MEMUSER | | |
| 3MEMUSER | +--Other: 1,123,240 bytes / 120 allocations |
| 1MEMUSER | |
| 2MEMUSER +--Class Libraries: 2,599,463,024 bytes / 2732 allocations |
| 2MEMUSER | | |
| 3MEMUSER | +--Harmony Class Libraries: 1,024 bytes / 1 allocation |
| 2MEMUSER | | |
| 3MEMUSER | +--VM Class Libraries: 2,599,462,000 bytes / 2731 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--sun.misc.Unsafe: 2,598,510,480 bytes / 2484 allocations |
| 4MEMUSER | | | | |
| 5MEMUSER | | | +--Direct Byte Buffers: 2,598,510,480 bytes / 2484 allocations |
| 3MEMUSER | | | |
| 4MEMUSER | | +--Other: 951,520 bytes / 247 allocations |
| 1MEMUSER | |
| 2MEMUSER +--Unknown: 2,112 bytes / 16 allocations |
| NULL |
| </code></pre> |
| |
| <p>In the <code>VM Class Libraries</code> section, the amount of memory allocated for <code>Direct Byte Buffers</code> is shown. Because the <code>NativeOutOfMemoryError</code> was received on a small 32-bit system, a value of <code>2,598,510,480 bytes</code> indicates that the operating system has run out of memory. On a larger UNIX system, the process might have run out of memory because of the <code>ulimit</code> setting. Increasing the value for <code>ulimit</code> might avoid the error, which you can do temporarily by setting <code>ulimit -f unlimited</code> in your current session.</p> |
| <p>The theoretical maximum size for a 32-bit process is the size of the 32-bit address space, which is 4 GB. On most operating systems a portion of the address space for each process is used by the kernel, such that the real limit for 32-bit processes is actually significantly less than 4GB. As a result, running out of native memory with a 32-bit VM is quite common.</p> |
| <p>The same 4 GB limit is also important if you are using a 64-bit VM with compressed references. In compressed references mode, all references to objects, classes, threads, and monitors are represented by 32-bit values for performance reasons, so these structures can be allocated only at 32-bit addresses. However, the operating system might place other allocations within this 4 GB of address space, and if this area becomes sufficiently full or fragmented, the VM throws a native <code>NativeOutOfMemoryError</code> error. These errors typically occur when the VM tries to create a new thread or load a class. The <strong>Current Thread History</strong> section should contain more information about what the thread was doing at the VM level when the <code>NativeOutOfMemoryError</code> error occurred.</p> |
| <p>You can usually avoid this type of problem by using the <code>-Xmcrs</code> option to reserve a contiguous area of memory within the lowest 4GB of memory at VM startup.</p> |
| <p>Another common cause of a <code>NativeOutOfMemoryError</code> is when an application loads duplicate classes. Classes are allocated outside of the Java heap in native memory. If the value reported for <code>Classes</code> in the NATIVEMEMINFO section is very large, duplicate classes might be the cause of your problem. The <a href="https://www.eclipse.org/mat/">Eclipse Memory Analyzer Tool (MAT)</a> can tell you if you have duplicate classes by using the <em>Class Loader Explorer</em> feature. Because a system dump is automatically generated as well as a Java dump in response to a <code>NativeOutOfMemoryError</code>, simply open the system dump in MAT to continue your diagnosis. </p> |
| <h3 id="deadlock">Deadlock</h3> |
| <p>Deadlocks occur when two threads attempt to synchronize on an object and lock an instance of a class. When this happens, your application stops responding and hangs. Generating a Java dump file will quickly tell you whether you have a deadlock situation. Trigger the Java dump by sending a SIGQUIT signal (<code>kill -3</code>) to the VM.</p> |
| <p>The VM can detect the most common types of deadlock scenario involving Java monitors. If this type of deadlock is detected, information is provided in the LOCKS section. More complex deadlocks, including those that involve a mixture of native mutexes and Java monitors, are not detected.</p> |
| <p>Here is the output from the code that was used to cause a common deadlock scenario:</p> |
| <pre><code>NULL |
| 1LKDEADLOCK Deadlock detected !!! |
| NULL --------------------- |
| NULL |
| 2LKDEADLOCKTHR Thread "Worker Thread 2" (0x94501D00) |
| 3LKDEADLOCKWTR is waiting for: |
| 4LKDEADLOCKMON sys_mon_t:0x08C2B344 infl_mon_t: 0x08C2B384: |
| 4LKDEADLOCKOBJ java/lang/Object@0xB5666698 |
| 3LKDEADLOCKOWN which is owned by: |
| 2LKDEADLOCKTHR Thread "Worker Thread 3" (0x94507500) |
| 3LKDEADLOCKWTR which is waiting for: |
| 4LKDEADLOCKMON sys_mon_t:0x08C2B3A0 infl_mon_t: 0x08C2B3E0: |
| 4LKDEADLOCKOBJ java/lang/Object@0xB5666678 |
| 3LKDEADLOCKOWN which is owned by: |
| 2LKDEADLOCKTHR Thread "Worker Thread 1" (0x92A3EC00) |
| 3LKDEADLOCKWTR which is waiting for: |
| 4LKDEADLOCKMON sys_mon_t:0x08C2B2E8 infl_mon_t: 0x08C2B328: |
| 4LKDEADLOCKOBJ java/lang/Object@0xB5666688 |
| 3LKDEADLOCKOWN which is owned by: |
| 2LKDEADLOCKTHR Thread "Worker Thread 2" (0x94501D00) |
| </code></pre> |
| |
| <p>This output tells you that <code>Worker Thread 2</code> is waiting for <code>Worker Thread 3</code>, which is waiting for <code>Worker Thread 1</code>. Because <code>Worker Thread 1</code> is also waiting for <code>Worker Thread 2</code>, there is a deadlock. The next place to look is the output for Java and native stacks, in the THREADS section. By looking at the stack for each of these worker threads you can trace the problem back to specific lines in your application code.</p> |
| <p>In this example, you can see from the following output that for all worker threads, the stack traces (<code>4XESTACKTRACE</code>/<code>5XESTACKTRACE</code>) indicate a problem in line 35 of the application <code>DeadLockTest.java</code>:</p> |
| <pre><code>3XMTHREADINFO "Worker Thread 1" J9VMThread:0x92A3EC00, omrthread_t:0x92A3C2B0, java/lang/Thread:0xB5666778, state:B, prio=5 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0x13, isDaemon:false) |
| 3XMTHREADINFO1 (native thread ID:0x52CF, native priority:0x5, native policy:UNKNOWN, vmstate:B, vm thread flags:0x00000201) |
| 3XMTHREADINFO2 (native stack address range from:0x9297E000, to:0x929BF000, size:0x41000) |
| 3XMCPUTIME CPU usage total: 0.004365543 secs, current category="Application" |
| 3XMTHREADBLOCK Blocked on: java/lang/Object@0xB5666688 Owned by: "Worker Thread 2" (J9VMThread:0x94501D00, java/lang/Thread:0xB56668D0) |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 Java callstack: |
| 4XESTACKTRACE at WorkerThread.run(DeadLockTest.java:35) |
| 5XESTACKTRACE (entered lock: java/lang/Object@0xB5666678, entry count: 1) |
| ... |
| 3XMTHREADINFO "Worker Thread 2" J9VMThread:0x94501D00, omrthread_t:0x92A3C8F0, java/lang/Thread:0xB56668D0, state:B, prio=5 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0x14, isDaemon:false) |
| 3XMTHREADINFO1 (native thread ID:0x52D0, native priority:0x5, native policy:UNKNOWN, vmstate:B, vm thread flags:0x00000201) |
| 3XMTHREADINFO2 (native stack address range from:0x946BF000, to:0x94700000, size:0x41000) |
| 3XMCPUTIME CPU usage total: 0.004555580 secs, current category="Application" |
| 3XMTHREADBLOCK Blocked on: java/lang/Object@0xB5666698 Owned by: "Worker Thread 3" (J9VMThread:0x94507500, java/lang/Thread:0xB5666A18) |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 Java callstack: |
| 4XESTACKTRACE at WorkerThread.run(DeadLockTest.java:35) |
| 5XESTACKTRACE (entered lock: java/lang/Object@0xB5666688, entry count: 1) |
| ... |
| 3XMTHREADINFO "Worker Thread 3" J9VMThread:0x94507500, omrthread_t:0x92A3CC10, java/lang/Thread:0xB5666A18, state:B, prio=5 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0x15, isDaemon:false) |
| 3XMTHREADINFO1 (native thread ID:0x52D1, native priority:0x5, native policy:UNKNOWN, vmstate:B, vm thread flags:0x00000201) |
| 3XMTHREADINFO2 (native stack address range from:0x9467E000, to:0x946BF000, size:0x41000) |
| 3XMCPUTIME CPU usage total: 0.003657010 secs, current category="Application" |
| 3XMTHREADBLOCK Blocked on: java/lang/Object@0xB5666678 Owned by: "Worker Thread 1" (J9VMThread:0x92A3EC00, java/lang/Thread:0xB5666778) |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 Java callstack: |
| 4XESTACKTRACE at WorkerThread.run(DeadLockTest.java:35) |
| 5XESTACKTRACE (entered lock: java/lang/Object@0xB5666698, entry count: 1) |
| </code></pre> |
| |
| <h3 id="hang">Hang</h3> |
| <p>An application can hang for a number of reasons but the most common cause is excessive global garbage collection (GC) activity, where your application is repeatedly paused because your Java heap has <em>almost</em> run out of memory. You can identify this problem by looking at verbose GC output. Collect this output by specifying the <code>-verbose:gc</code> option.</p> |
| <p>Deadlock situations can also manifest themselves as hangs. For more information on diagnosing this type of problem from a Java dump, see the <a href="#deadlock">deadlock</a> scenario.</p> |
| <p>If you have eliminated verbose GC activity and deadlocks, another common hang scenario involves threads that compete and wait for Java object locks. This type of problem can usually be diagnosed by examining a Java dump. The simplest hang scenario involving Java object locks is where a thread acquires a lock that other threads are waiting for, but it doesn't release the lock for some reason.</p> |
| <p>The first place to look in the Java dump output is the <strong>LOCKS</strong> section. This section lists all the monitors and shows which threads have acquired a lock and which threads are waiting. If the hang is caused by a thread not releasing a lock that other threads need, you can see a list of waiting threads in the output.</p> |
| <p>In this example scenario, the Java dump <strong>LOCKS</strong> section shows that <code>Worker Thread 0</code> (<code>3LKMONOBJECT</code>) has acquired a lock and there are 19 other worker threads waiting to obtain the lock.</p> |
| <pre><code>NULL ------------------------------------------------------------------------ |
| 0SECTION LOCKS subcomponent dump routine |
| NULL =============================== |
| NULL |
| 1LKPOOLINFO Monitor pool info: |
| 2LKPOOLTOTAL Current total number of monitors: 1 |
| NULL |
| 1LKMONPOOLDUMP Monitor Pool Dump (flat & inflated object-monitors): |
| 2LKMONINUSE sys_mon_t:0x92711200 infl_mon_t: 0x92711240: |
| 3LKMONOBJECT java/lang/Object@0xB56658D8: Flat locked by "Worker Thread 0" (J9VMThread:0x92A3EC00), entry count 1 |
| 3LKWAITERQ Waiting to enter: |
| 3LKWAITER "Worker Thread 1" (J9VMThread:0x92703F00) |
| 3LKWAITER "Worker Thread 2" (J9VMThread:0x92709C00) |
| 3LKWAITER "Worker Thread 3" (J9VMThread:0x92710A00) |
| 3LKWAITER "Worker Thread 4" (J9VMThread:0x92717F00) |
| 3LKWAITER "Worker Thread 5" (J9VMThread:0x9271DC00) |
| 3LKWAITER "Worker Thread 6" (J9VMThread:0x92723A00) |
| 3LKWAITER "Worker Thread 7" (J9VMThread:0x92729800) |
| 3LKWAITER "Worker Thread 8" (J9VMThread:0x92733700) |
| 3LKWAITER "Worker Thread 9" (J9VMThread:0x92739400) |
| 3LKWAITER "Worker Thread 10" (J9VMThread:0x92740200) |
| 3LKWAITER "Worker Thread 11" (J9VMThread:0x92748100) |
| 3LKWAITER "Worker Thread 12" (J9VMThread:0x9274DF00) |
| 3LKWAITER "Worker Thread 13" (J9VMThread:0x92754D00) |
| 3LKWAITER "Worker Thread 14" (J9VMThread:0x9275AA00) |
| 3LKWAITER "Worker Thread 15" (J9VMThread:0x92760800) |
| 3LKWAITER "Worker Thread 16" (J9VMThread:0x92766600) |
| 3LKWAITER "Worker Thread 17" (J9VMThread:0x9276C300) |
| 3LKWAITER "Worker Thread 18" (J9VMThread:0x92773100) |
| 3LKWAITER "Worker Thread 19" (J9VMThread:0x92778F00) |
| NULL |
| </code></pre> |
| |
| <p>The next step is to determine why <code>Worker Thread 0</code> is not releasing the lock. The best place to start is the stack trace for this thread, which you can find by searching on the thread name or J9VMThread ID in the <strong>THREADS</strong> section.</p> |
| <p>The following extract shows the details for <code>"Worker Thread 0" (J9VMThread:0x92A3EC00)</code>:</p> |
| <pre><code>NULL |
| 3XMTHREADINFO "Worker Thread 0" J9VMThread:0x92A3EC00, omrthread_t:0x92A3C280, java/lang/Thread:0xB56668B8, state:CW, prio=5 |
| 3XMJAVALTHREAD (java/lang/Thread getId:0x13, isDaemon:false) |
| 3XMTHREADINFO1 (native thread ID:0x511F, native priority:0x5, native policy:UNKNOWN, vmstate:CW, vm thread flags:0x00000401) |
| 3XMTHREADINFO2 (native stack address range from:0x9297E000, to:0x929BF000, size:0x41000) |
| 3XMCPUTIME CPU usage total: 0.000211878 secs, current category="Application" |
| 3XMHEAPALLOC Heap bytes allocated since last GC cycle=0 (0x0) |
| 3XMTHREADINFO3 Java callstack: |
| 4XESTACKTRACE at java/lang/Thread.sleep(Native Method) |
| 4XESTACKTRACE at java/lang/Thread.sleep(Thread.java:941) |
| 4XESTACKTRACE at WorkerThread.doWork(HangTest.java:37) |
| 4XESTACKTRACE at WorkerThread.run(HangTest.java:31) |
| 5XESTACKTRACE (entered lock: java/lang/Object@0xB56658D8, entry count: 1) |
| </code></pre> |
| |
| <p>In the last line of this output you can see where the thread acquired the lock. Working up from this line, you can see that <code>WorkerThread.run</code> was called, which in turn called <code>WorkerThread.doWork</code>. The stack shows that the thread then entered a call to <code>java/lang/Thread.sleep</code> in HangTest.java on line 37, which is preventing the thread from completing its work and releasing the lock. In this example the <code>sleep</code> call was added to induce a hang, but in real-world scenarios the cause could be any blocking operation, such as reading from an input stream or socket. Another possibility is that the thread is waiting for <em>another</em> lock owned by yet another thread.</p> |
| <p>It is important to remember that each Java dump represents a single snapshot in time. You should generate at least three Java dumps separated by a short pause, for example 30 seconds, and compare the output. This comparison tells you whether the threads involved are stuck in a fixed state or whether they are moving.</p> |
| <p>In this example, the threads do not move and the investigation needs to focus on the logic in <code>WorkerThread.doWork</code> to understand why <code>Worker Thread 0</code> entered the <code>java/lang/Thread.sleep</code> call.</p> |
| <p>Another common scenario is where each Java dump shows a number of threads waiting for a lock owned by another thread, but the list of waiting threads and the lock-owning thread change over time. In this case the cause is likely to be a bottleneck caused by thread contention, where the threads are continually competing for the same lock. In severe cases, the lock is held only for a small amount of time but there are lots of threads trying to obtain it. Because more time is spent handling the lock and scheduling the thread than executing application code, the degradation in performance is manifested as a hang. Thread contention is usually caused by an application design problem. You can use a similar approach to the one used in this scenario to determime which lines of code are responsible for the contention.</p> |
| <!-- ==== END OF TOPIC ==== dump_javadump.md ==== --> |
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