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      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-13" type="checkbox" id="nav-13">
    
    <label class="md-nav__link" for="nav-13">
      Command-line options
    </label>
    <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
      <label class="md-nav__title" for="nav-13">
        Command-line options
      </label>
      <ul class="md-nav__list" data-md-scrollfix>
        
        
  <li class="md-nav__item">
    <a href="../cmdline_specifying/" title="Specifying options" class="md-nav__link">
      Specifying options
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../cmdline_general/" title="Standard options" class="md-nav__link">
      Standard options
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../cmdline_migration/" title="Switching to OpenJ9" class="md-nav__link">
      Switching to OpenJ9
    </a>
  </li>

        
  <li class="md-nav__item md-nav__item--nested">
    
      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-13-4" type="checkbox" id="nav-13-4">
    
    <label class="md-nav__link" for="nav-13-4">
      System property options
    </label>
    <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
      <label class="md-nav__title" for="nav-13-4">
        System property options
      </label>
      <ul class="md-nav__list" data-md-scrollfix>
        
        
  <li class="md-nav__item">
    <a href="../d_jvm_commands/" title="Using System properties" class="md-nav__link">
      Using System properties
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmenableclasscaching/" title="-Dcom.ibm.enableClassCaching" class="md-nav__link">
      -Dcom.ibm.enableClassCaching
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmenablelegacydumpsecurity/" title="-Dcom.ibm.enableLegacyDumpSecurity" class="md-nav__link">
      -Dcom.ibm.enableLegacyDumpSecurity
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmenablelegacylogsecurity/" title="-Dcom.ibm.enableLegacyLogSecurity" class="md-nav__link">
      -Dcom.ibm.enableLegacyLogSecurity
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmenablelegacytracesecurity/" title="-Dcom.ibm.enableLegacyTraceSecurity" class="md-nav__link">
      -Dcom.ibm.enableLegacyTraceSecurity
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmgpudisable/" title="-Dcom.ibm.gpu.disable" class="md-nav__link">
      -Dcom.ibm.gpu.disable
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmgpuenable/" title="-Dcom.ibm.gpu.enable" class="md-nav__link">
      -Dcom.ibm.gpu.enable
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmgpuverbose/" title="-Dcom.ibm.gpu.verbose" class="md-nav__link">
      -Dcom.ibm.gpu.verbose
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmlangmanagementosmxbeaniscputime100ns/" title="-Dcom.ibm.lang.management.OperatingSystemMXBean.isCpuTime100ns" class="md-nav__link">
      -Dcom.ibm.lang.management.OperatingSystemMXBean.isCpuTime100ns
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmlangmanagementverbose/" title="-Dcom.ibm.lang.management.verbose" class="md-nav__link">
      -Dcom.ibm.lang.management.verbose
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachcommand_timeout/" title="-Dcom.ibm.tools.attach.command_timeout" class="md-nav__link">
      -Dcom.ibm.tools.attach.command_timeout
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachdirectory/" title="-Dcom.ibm.tools.attach.directory" class="md-nav__link">
      -Dcom.ibm.tools.attach.directory
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachdisplayname/" title="-Dcom.ibm.tools.attach.displayName" class="md-nav__link">
      -Dcom.ibm.tools.attach.displayName
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachenable/" title="-Dcom.ibm.tools.attach.enable" class="md-nav__link">
      -Dcom.ibm.tools.attach.enable
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachid/" title="-Dcom.ibm.tools.attach.id" class="md-nav__link">
      -Dcom.ibm.tools.attach.id
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachlogging/" title="-Dcom.ibm.tools.attach.logging" class="md-nav__link">
      -Dcom.ibm.tools.attach.logging
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachlogname/" title="-Dcom.ibm.tools.attach.log.name" class="md-nav__link">
      -Dcom.ibm.tools.attach.log.name
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachshutdown_timeout/" title="-Dcom.ibm.tools.attach.shutdown_timeout" class="md-nav__link">
      -Dcom.ibm.tools.attach.shutdown_timeout
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dcomibmtoolsattachtimeout/" title="-Dcom.ibm.tools.attach.timeout" class="md-nav__link">
      -Dcom.ibm.tools.attach.timeout
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../dfileencoding/" title="-Dfile.encoding" class="md-nav__link">
      -Dfile.encoding
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djavacompiler/" title="-Djava.compiler" class="md-nav__link">
      -Djava.compiler
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djavalangstringsubstringnocopy/" title="-Djava.lang.string.substring.nocopy" class="md-nav__link">
      -Djava.lang.string.substring.nocopy
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djavalangstringbuffergrowaggressively/" title="-Djava.lang.stringBuffer.growAggressively" class="md-nav__link">
      -Djava.lang.stringBuffer.growAggressively
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djdknativecbc/" title="-Djdk.nativeCBC" class="md-nav__link">
      -Djdk.nativeCBC
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djdknativechacha20/" title="-Djdk.nativeChaCha20" class="md-nav__link">
      -Djdk.nativeChaCha20
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djdknativecrypto/" title="-Djdk.nativeCrypto" class="md-nav__link">
      -Djdk.nativeCrypto
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djdknativedigest/" title="-Djdk.nativeDigest" class="md-nav__link">
      -Djdk.nativeDigest
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djdknativegcm/" title="-Djdk.nativeGCM" class="md-nav__link">
      -Djdk.nativeGCM
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../djdknativersa/" title="-Djdk.nativeRSA" class="md-nav__link">
      -Djdk.nativeRSA
    </a>
  </li>

        
      </ul>
    </nav>
  </li>

        
  <li class="md-nav__item md-nav__item--nested">
    
      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-13-5" type="checkbox" id="nav-13-5">
    
    <label class="md-nav__link" for="nav-13-5">
      JVM -X options
    </label>
    <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
      <label class="md-nav__title" for="nav-13-5">
        JVM -X options
      </label>
      <ul class="md-nav__list" data-md-scrollfix>
        
        
  <li class="md-nav__item">
    <a href="../x_jvm_commands/" title="Using -X options" class="md-nav__link">
      Using -X options
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../x/" title="-X" class="md-nav__link">
      -X
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xaggressive/" title="-Xaggressive" class="md-nav__link">
      -Xaggressive
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xalwaysclassgc/" title="-Xalwaysclassgc" class="md-nav__link">
      -Xalwaysclassgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xaot/" title="-Xaot" class="md-nav__link">
      -Xaot
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xargencoding/" title="-Xargencoding" class="md-nav__link">
      -Xargencoding
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xbootclasspath/" title="-Xbootclasspath" class="md-nav__link">
      -Xbootclasspath
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xceehdlr/" title="-XCEEHDLR" class="md-nav__link">
      -XCEEHDLR
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcheck/" title="-Xcheck" class="md-nav__link">
      -Xcheck
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xclassgc/" title="-Xclassgc" class="md-nav__link">
      -Xclassgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcodecache/" title="-Xcodecache" class="md-nav__link">
      -Xcodecache
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcodecachetotal/" title="-Xcodecachetotal" class="md-nav__link">
      -Xcodecachetotal
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcomp/" title="-Xcomp" class="md-nav__link">
      -Xcomp
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcompactexplicitgc/" title="-Xcompactexplicitgc" class="md-nav__link">
      -Xcompactexplicitgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcompactgc/" title="-Xcompactgc" class="md-nav__link">
      -Xcompactgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcompilationthreads/" title="-XcompilationThreads" class="md-nav__link">
      -XcompilationThreads
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcompressedrefs/" title="-Xcompressedrefs" class="md-nav__link">
      -Xcompressedrefs
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xconcurrentbackground/" title="-Xconcurrentbackground" class="md-nav__link">
      -Xconcurrentbackground
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xconcurrentlevel/" title="-Xconcurrentlevel" class="md-nav__link">
      -Xconcurrentlevel
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xconcurrentslack/" title="-Xconcurrentslack" class="md-nav__link">
      -Xconcurrentslack
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xconmeter/" title="-Xconmeter" class="md-nav__link">
      -Xconmeter
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xenableexcessivegc/" title="-Xdisableexcessivegc" class="md-nav__link">
      -Xdisableexcessivegc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xenableexplicitgc/" title="-Xdisableexplicitgc" class="md-nav__link">
      -Xdisableexplicitgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xdisablejavadump/" title="-Xdisablejavadump" class="md-nav__link">
      -Xdisablejavadump
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xenablestringconstantgc/" title="-Xdisablestringconstantgc" class="md-nav__link">
      -Xdisablestringconstantgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xdump/" title="-Xdump" class="md-nav__link">
      -Xdump
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xenableexcessivegc/" title="-Xenableexcessivegc" class="md-nav__link">
      -Xenableexcessivegc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xenableexplicitgc/" title="-Xenableexplicitgc" class="md-nav__link">
      -Xenableexplicitgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xenablestringconstantgc/" title="-Xenablestringconstantgc" class="md-nav__link">
      -Xenablestringconstantgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xfastresolve/" title="-Xfastresolve" class="md-nav__link">
      -Xfastresolve
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xfuture/" title="-Xfuture" class="md-nav__link">
      -Xfuture
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xgc/" title="-Xgc" class="md-nav__link">
      -Xgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xgcsplitheap/" title="-Xgc:splitheap" class="md-nav__link">
      -Xgc:splitheap
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xgcpolicy/" title="-Xgcpolicy" class="md-nav__link">
      -Xgcpolicy
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xgcthreads/" title="-Xgcthreads" class="md-nav__link">
      -Xgcthreads
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xgcworkpackets/" title="-Xgcworkpackets" class="md-nav__link">
      -Xgcworkpackets
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xint/" title="-Xint" class="md-nav__link">
      -Xint
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xss/" title="-Xiss" class="md-nav__link">
      -Xiss
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xjit/" title="-Xjit" class="md-nav__link">
      -Xjit
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xjni/" title="-Xjni" class="md-nav__link">
      -Xjni
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xlinenumbers/" title="-Xlinenumbers" class="md-nav__link">
      -Xlinenumbers
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xloa/" title="-Xloa" class="md-nav__link">
      -Xloa
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xloaminimum/" title="-Xloainitial" class="md-nav__link">
      -Xloainitial
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xloaminimum/" title="-Xloamaximum" class="md-nav__link">
      -Xloamaximum
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xloaminimum/" title="-Xloaminimum" class="md-nav__link">
      -Xloaminimum
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xlockreservation/" title="-XlockReservation" class="md-nav__link">
      -XlockReservation
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xlockword/" title="-Xlockword" class="md-nav__link">
      -Xlockword
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xlog/" title="-Xlog" class="md-nav__link">
      -Xlog
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xlp/" title="-Xlp" class="md-nav__link">
      -Xlp
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xlpcodecache/" title="-Xlp:codecache" class="md-nav__link">
      -Xlp:codecache
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xlpobjectheap/" title="-Xlp:objectheap" class="md-nav__link">
      -Xlp:objectheap
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmine/" title="-Xmaxe" class="md-nav__link">
      -Xmaxe
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xminf/" title="-Xmaxf" class="md-nav__link">
      -Xmaxf
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmint/" title="-Xmaxt" class="md-nav__link">
      -Xmaxt
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmca/" title="-Xmca" class="md-nav__link">
      -Xmca
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmca/" title="-Xmco" class="md-nav__link">
      -Xmco
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmcrs/" title="-Xmcrs" class="md-nav__link">
      -Xmcrs
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmine/" title="-Xmine" class="md-nav__link">
      -Xmine
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xminf/" title="-Xminf" class="md-nav__link">
      -Xminf
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmint/" title="-Xmint" class="md-nav__link">
      -Xmint
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmn/" title="-Xmn" class="md-nav__link">
      -Xmn
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmn/" title="-Xmns" class="md-nav__link">
      -Xmns
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmn/" title="-Xmnx" class="md-nav__link">
      -Xmnx
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmo/" title="-Xmo" class="md-nav__link">
      -Xmo
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmo/" title="-Xmoi" class="md-nav__link">
      -Xmoi
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmo/" title="-Xmos" class="md-nav__link">
      -Xmos
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmo/" title="-Xmox" class="md-nav__link">
      -Xmox
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmr/" title="-Xmr" class="md-nav__link">
      -Xmr
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmr/" title="-Xmrx" class="md-nav__link">
      -Xmrx
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xms/" title="-Xms" class="md-nav__link">
      -Xms
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xmso/" title="-Xmso" class="md-nav__link">
      -Xmso
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xms/" title="-Xmx" class="md-nav__link">
      -Xmx
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xaot/" title="-Xnoaot" class="md-nav__link">
      -Xnoaot
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xclassgc/" title="-Xnoclassgc" class="md-nav__link">
      -Xnoclassgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcompactexplicitgc/" title="-Xnocompactexplicitgc" class="md-nav__link">
      -Xnocompactexplicitgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcompactgc/" title="-Xnocompactgc" class="md-nav__link">
      -Xnocompactgc
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xcompressedrefs/" title="-Xnocompressedrefs" class="md-nav__link">
      -Xnocompressedrefs
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xjit/" title="-Xnojit" class="md-nav__link">
      -Xnojit
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xlinenumbers/" title="-Xnolinenumbers" class="md-nav__link">
      -Xnolinenumbers
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xloa/" title="-Xnoloa" class="md-nav__link">
      -Xnoloa
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xsigcatch/" title="-Xnosigcatch" class="md-nav__link">
      -Xnosigcatch
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xsigchain/" title="-Xnosigchain" class="md-nav__link">
      -Xnosigchain
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xnumanone/" title="-Xnuma:none" class="md-nav__link">
      -Xnuma:none
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xoptionsfile/" title="-Xoptionsfile" class="md-nav__link">
      -Xoptionsfile
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xquickstart/" title="-Xquickstart" class="md-nav__link">
      -Xquickstart
    </a>
  </li>

        
  <li class="md-nav__item">
    <a href="../xrs/" title="-Xrs" class="md-nav__link">
      -Xrs
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<h1 id="default-settings-for-the-openj9-vm">Default settings for the OpenJ9 VM</h1>
<p>The following tables provide a quick reference to the default settings for the VM when it is first installed.</p>
<p>The last 2 columns show whether the default setting can be changed by a command-line parameter or an environment variable. Note that if both are set, the command-line parameter always takes precedence.</p>
<table>
<thead>
<tr>
<th>VM setting</th>
<th>Default</th>
<th align="center">Command line</th>
<th align="center">Env. variable</th>
</tr>
</thead>
<tbody>
<tr>
<td>Javadump</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Heapdump</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>System dump</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Snap traces</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>JIT dump</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Verbose output</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Compressed references</td>
<td>(See <strong>Note 1</strong>)</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Boot classpath search</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>JNI checks</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Remote debugging</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Strict conformance checks</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Quickstart</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Remote debug info server</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Reduced signaling</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Signal handler chaining</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Classpath</td>
<td>Not set</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Class data sharing</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Accessibility support</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>JIT compiler</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>AOT compiler (See <strong>Note 2</strong>)</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>JIT debug options</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Java2D max size of fonts with algorithmic bold</td>
<td>14 point</td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Java2D use rendered bitmaps in scalable fonts</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Java2D freetype font rasterizing</td>
<td>Enabled</td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Java2D use AWT fonts</td>
<td>Disabled</td>
<td align="center"><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
</tbody>
</table>
<p><i class="fa fa-pencil-square-o" aria-hidden="true"></i> <strong>Notes:</strong></p>
<ol>
<li>
<p>On AIX&reg;, Linux&reg;, macOS&reg;, and Windows&trade;: Enabled for <strong>-Xmx</strong> values &le; 57 GB, otherwise disabled.</p></p>
<p>On z/OS&reg;: Enabled for <strong>-Xmx</strong> values &le; 25 GB, otherwise disabled. With <a href="https://www.ibm.com/support/docview.wss?uid=isg1OA49416">APAR OA49416</a>, enabled for <strong>-Xmx</strong> values &le; 57 GB.</p>
</li>
<li>
<p>AOT is not used by the VM unless shared classes are also enabled.</p>
</li>
</ol>
<table>
<thead>
<tr>
<th>VM setting</th>
<th>AIX</th>
<th>Linux</th>
<th>macOS</th>
<th>Windows</th>
<th>z/OS</th>
<th>Command line</th>
<th>Env. variable</th>
</tr>
</thead>
<tbody>
<tr>
<td>Default locale</td>
<td>None</td>
<td>None</td>
<td>None</td>
<td>N/A</td>
<td>None</td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Time to wait before starting plug-in</td>
<td>N/A</td>
<td>Zero</td>
<td>N/A</td>
<td>N/A</td>
<td>N/A</td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Temporary directory</td>
<td><code>/tmp</code></td>
<td><code>/tmp</code></td>
<td><code>/tmp</code></td>
<td><code>c:\temp</code></td>
<td><code>/tmp</code></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Plug-in redirection</td>
<td>None</td>
<td>None</td>
<td>None</td>
<td>N/A</td>
<td>None</td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>IM switching</td>
<td>Disabled</td>
<td>Disabled</td>
<td>Disabled</td>
<td>N/A</td>
<td>Disabled</td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>IM modifiers</td>
<td>Disabled</td>
<td>Disabled</td>
<td>Disabled</td>
<td>N/A</td>
<td>Disabled</td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Thread model</td>
<td>N/A</td>
<td>N/A</td>
<td>N/A</td>
<td>N/A</td>
<td>Native</td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>Initial stack size for Java Threads <strong>(32/64-bit)</strong>. Use <code>-Xiss&lt;size&gt;</code></td>
<td>2 KB</td>
<td>2 KB</td>
<td>2 KB</td>
<td>2 KB</td>
<td>2 KB</td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Maximum stack size for Java Threads <strong>(32-bit)</strong>. Use <code>-Xss&lt;size&gt;</code></td>
<td>320 KB</td>
<td>320 KB</td>
<td>N/A</td>
<td>320 KB</td>
<td>320 KB</td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Maximum stack size for Java Threads <strong>(64-bit)</strong>. Use <code>-Xss&lt;size&gt;</code></td>
<td>1024 KB</td>
<td>1024 KB</td>
<td>1024 KB</td>
<td>1024 KB</td>
<td>1024 KB</td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Stack size for OS Threads <strong>(32-bit)</strong>. Use <code>-Xmso&lt;size&gt;</code></td>
<td>256 KB</td>
<td>256 KB</td>
<td>N/A</td>
<td>32 KB</td>
<td>256 KB</td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Stack size for OS Threads <strong>(64-bit)</strong>. Use <code>-Xmso&lt;size&gt;</code></td>
<td>256 KB</td>
<td>256 KB</td>
<td>256 KB</td>
<td>256 KB</td>
<td>1 MB</td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Initial heap size. Use <code>-Xms&lt;size&gt;</code></td>
<td>8 MB</td>
<td>8 MB</td>
<td>8 MB</td>
<td>8 MB</td>
<td>8 MB</td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Maximum Java heap size. Use <code>-Xmx&lt;size&gt;</code></td>
<td>See <strong>Notes</strong></td>
<td>See <strong>Notes</strong></td>
<td>See <strong>Notes</strong></td>
<td>See <strong>Notes</strong></td>
<td>See <strong>Notes</strong></td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
<tr>
<td>Page size for the Java object heap and code cache (For restrictions, see the <code>-Xlp:codecache</code> and <code>-Xlp:objectheap</code> options).</td>
<td>Operating system default</td>
<td>Architecture: x86: 2MB, IBM Z&reg;: 1MB, Other architectures: Operating system default</td>
<td>4 KB</td>
<td>Operating system default</td>
<td>1M pageable</td>
<td><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
<td><i class="fa fa-times" aria-hidden="true"></i><span class="sr-only">no</span></td>
</tr>
</tbody>
</table>
<p><i class="fa fa-pencil-square-o" aria-hidden="true"></i> <strong>Notes:</strong></p>
<p>The default value of <a href="../xms/"><code>-Xmx</code></a> :</p>
<ul>
<li>
<p>The value is 25% of the available memory with a maximum of 25 GB. However, where there is 2 GB or less of physical memory, the value set is 50% of available memory with a minimum value of 16 MB and a maximum value of 512 MB.</p>
</li>
<li>
<p>On Linux&reg; sytems, if the VM is running in a container and <a href="../xxusecontainersupport/">`-XX:+UseContainerSupport</a> is enabled, the value is 75% of the container memory limit, with a maximum of 25 GB. However, if the container memory limit is less than 1 GB, the value is 50% of the container memory limit. If the container memory limit is between 1GB and 2GB, the value is the container memory limit minus 512 MB.</p>
</li>
<li>
<p>The default value is capped at 25 GB, which is the limit of heap size for 3-bit shift of compressed references (see <a href="../xcompressedrefs/">-Xcompressedrefs</a>), to prevent silent switching to 4-bit shift of compressed references, which has possible performance penalties. You can use the <a href="../xms/"><code>-Xmx</code></a> option to overwrite the 25 GB limit.</p>
</li>
<li>
<p><img alt="Start of content that applies only to Java 8 (LTS)" src="../cr/java8.png" /> If you have set the <a href="../xxoriginaljdk8heapsizecompatibilitymode/">-XX:+OriginalJDK8HeapSizeCompatibilityMode</a> option for compatibility with earlier releases, the value is half the available memory with a minimum of 16 MB and a maximum of 512 MB. <img alt="End of content that applies only to Java 8 (LTS)" src="../cr/java_close_lts.png" /></p>
</li>
</ul>
<p><em>Available memory</em> is defined as being the smallest of two values: The real or <em>physical</em> memory or the <em>RLIMIT_AS</em> value.</p>
                
                  
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