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       <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
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsamplingexpirationtime/" title="-XsamplingExpirationTime" class="md-nav__link">
       -XsamplingExpirationTime
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscdmx/" title="-Xscdmx" class="md-nav__link">
       -Xscdmx
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscminaot/" title="-Xscmaxaot" class="md-nav__link">
       -Xscmaxaot
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscminjitdata/" title="-Xscmaxjitdata" class="md-nav__link">
       -Xscmaxjitdata
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscminaot/" title="-Xscminaot" class="md-nav__link">
       -Xscminaot
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscminjitdata/" title="-Xscminjitdata" class="md-nav__link">
       -Xscminjitdata
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscmx/" title="-Xscmx" class="md-nav__link">
       -Xscmx
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xshareclasses/" title="-Xshareclasses" class="md-nav__link">
       -Xshareclasses
     </a>
   </li>


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


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


   <li class="md-nav__item">
     <a href="../xsignal/" title="-Xsignal" class="md-nav__link">
       -Xsignal
     </a>
   </li>


   <li class="md-nav__item">
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     reservedAbsoluteThreshold
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     minimumReservedRatio
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     cancelAbsoluteThreshold
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       -XX:[+|-]IgnoreUnrecognizedVMOptions
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       -XX:InitialHeapSize
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       -XX:[+|-]JITInlineWatches
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       -XX:MaxDirectMemorySize
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       -XX:MaxHeapSize
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       -XX:MaxRAMPercentage
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       -XX:OnOutOfMemoryError
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     <a href="../xxpagealigndirectmemory/" title="-XX:[+|-]PageAlignDirectMemory" class="md-nav__link">
       -XX:[+|-]PageAlignDirectMemory
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       -XX:ParallelCMSThreads
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       -XX:[+|-]PrintFlagsFinal
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       -XX:[+|-]ReadIPInfoForRAS
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       -XX:[+|-]ReduceCPUMonitorOverhead
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       -XXsetHWPrefetch
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       -XX:[+|-]UseContainerSupport
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       -XX:[+|-]UseGCStartupHints
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 <h1 id="-xx91-93globallockreservation">-XX:[+|-]GlobalLockReservation</h1>
 <p><strong>(AIX and Linux on Power systems only)</strong></p>
 <p>The <code>-XX:+GlobalLockReservation</code> option enables an optimization targeted towards more efficient handling of locking and unlocking Java&trade; objects.</p>
 <h2 id="syntax">Syntax</h2>
 <pre><code>    -XX:[+|-]GlobalLockReservation
     -XX:+GlobalLockReservation:&lt;parameter&gt;
 </code></pre>
 <table>
 <thead>
 <tr>
 <th>Setting</th>
 <th>Effect</th>
 <th align="center">Default</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td><code>-XX:+GlobalLockReservation</code></td>
 <td>Enable</td>
 <td align="center"></td>
 </tr>
 <tr>
 <td><code>-XX:-GlobalLockReservation</code></td>
 <td>Disable</td>
 <td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
 </tr>
 </tbody>
 </table>
 <p>This optimization is targeted towards applications with lots of uncontended locked objects that are being locked just to be safe. When enabled, heuristics are used to try and determine when an object will be exclusively locked by a single thread so that faster, more specialized code can be used for locking the object. If the heuristics incorrectly identify an object as a target for the optimization, performance might be adversely affected.</p>
 <p>The <code>-XX:-GlobalLockReservation</code> option turns off a previously enabled <code>-XX:+GlobalLockReservation</code> option.</p>
 <h2 id="parameters">Parameters</h2>
 <p>Advanced tuning parameters are shown in the following table:</p>
 <table>
 <thead>
 <tr>
 <th>Parameter</th>
 <th>Effect</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td><a href="#reservedtransitionthreshold"><code>reservedTransitionThreshold</code></a></td>
 <td>Changes amount of time spent analyzing an object.</td>
 </tr>
 <tr>
 <td><a href="#reservedabsolutethreshold"><code>reservedAbsoluteThreshold</code>  </a></td>
 <td>Changes amount of time spent analyzing a class for compatibility.</td>
 </tr>
 <tr>
 <td><a href="#minimumreservedratio"><code>minimumReservedRatio</code>       </a></td>
 <td>Changes aggression level for marking a class as highly compatible.</td>
 </tr>
 <tr>
 <td><a href="#cancelabsolutethreshold"><code>cancelAbsoluteThreshold</code>    </a></td>
 <td>Changes amount of time spent analyzing a class for incompatibility.</td>
 </tr>
 <tr>
 <td><a href="#minimumlearningratio"><code>minimumLearningRatio</code>       </a></td>
 <td>Changes aggression level for marking a class as highly incompatible.</td>
 </tr>
 </tbody>
 </table>
 <h3 id="reservedtransitionthreshold">reservedTransitionThreshold</h3>
 <pre><code>    -XX:+GlobalLockReservation:reservedTransitionThreshold=&lt;value&gt;
 </code></pre>
 <dl>
 <dd>
 <table>
 <thead>
 <tr>
 <th>Setting</th>
 <th>Value</th>
 <th>Default</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td><code>&lt;value&gt;</code></td>
 <td>number</td>
 <td>1</td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dd>
 <p>Number of times an object is locked by the same thread before it is considered reserved minus a value of 2. So, with a default value of 1, an object can be reserved the third time it is locked. <code>&lt;value&gt;</code> can be 0-3 inclusive. Values of 4 or higher are treated as infinity.</p>
 </dd>
 </dl>
 <h3 id="reservedabsolutethreshold">reservedAbsoluteThreshold</h3>
 <pre><code>    -XX:+GlobalLockReservation:reservedAbsoluteThreshold=&lt;value&gt;
 </code></pre>
 <dl>
 <dd>
 <table>
 <thead>
 <tr>
 <th>Setting</th>
 <th>Value</th>
 <th>Default</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td><code>&lt;value&gt;</code></td>
 <td>number</td>
 <td>10</td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dd>
 <p>Minimum number of objects of a class that get reserved before the class can be considered highly compatible. Objects of that class are reserved the first time they are locked. Values of 65536 or higher are treated as infinity.</p>
 </dd>
 </dl>
 <h3 id="minimumreservedratio">minimumReservedRatio</h3>
 <pre><code>    -XX:+GlobalLockReservation:minimumReservedRatio=&lt;value&gt;
 </code></pre>
 <dl>
 <dd>
 <table>
 <thead>
 <tr>
 <th>Setting</th>
 <th>Value</th>
 <th>Default</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td><code>&lt;value&gt;</code></td>
 <td>number</td>
 <td>1024</td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dd>
 <p>Minimum ratio of reserved objects to flat objects before a class can be considered highly compatible. Values of 65536 or higher are treated as infinity.</p>
 </dd>
 </dl>
 <h3 id="cancelabsolutethreshold">cancelAbsoluteThreshold</h3>
 <pre><code>    -XX:+GlobalLockReservation:cancelAbsoluteThreshold=&lt;value&gt;
 </code></pre>
 <dl>
 <dd>
 <table>
 <thead>
 <tr>
 <th>Setting</th>
 <th>Value</th>
 <th>Default</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td><code>&lt;value&gt;</code></td>
 <td>number</td>
 <td>10</td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dd>
 <p>Minimum number of objects of a class that get converted to flat before the class can be considered highly incompatible. Objects of that class are never reserved. Values of 65536 or higher are treated as infinity.</p>
 </dd>
 </dl>
 <h3 id="minimumlearningratio">minimumLearningRatio</h3>
 <pre><code>    -XX:+GlobalLockReservation:minimumLearningRatio=&lt;value&gt;
 </code></pre>
 <dl>
 <dd>
 <table>
 <thead>
 <tr>
 <th>Setting</th>
 <th>Value</th>
 <th>Default</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td><code>&lt;value&gt;</code></td>
 <td>number</td>
 <td>256</td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dd>
 <p>Minimum ratio of reserved objects to flat objects to prevent class from being considered highly incompatible. Values of 65536 or higher are treated as infinity.</p>
 </dd>
 </dl>
 <!-- ==== END OF TOPIC ==== xxgloballockreservation.md ==== -->


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