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    Compatible options
  </a>
  
</li>
      
        <li class="md-nav__item">
  <a href="#equivalent-options" class="md-nav__link">
    Equivalent options
  </a>
  
</li>
      
        <li class="md-nav__item">
  <a href="#creating-compatible-behavior" class="md-nav__link">
    Creating compatible behavior
  </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-12-4" type="checkbox" id="nav-12-4">
    
    <label class="md-nav__link" for="nav-12-4">
      System property options
    </label>
    <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
      <label class="md-nav__title" for="nav-12-4">
        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="../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="../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-12-5" type="checkbox" id="nav-12-5">
    
    <label class="md-nav__link" for="nav-12-5">
      JVM -X options
    </label>
    <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
      <label class="md-nav__title" for="nav-12-5">
        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="../xifa/" title="-Xifa" class="md-nav__link">
      -Xifa
    </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>
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<h1 id="switching-to-openj9">Switching to OpenJ9</h1>
<p>If you are already familiar with HotSpot command-line options but want the advantages of OpenJ9, the following information will prove helpful. In all cases, check individual topics for minor discrepancies in the way these options might work.</p>
<p><i class="fa fa-pencil-square-o" aria-hidden="true"></i> <strong>Note:</strong> For information about HotSpot equivalences and differences for items other than command-line options, see <a href="../openj9_newuser/">New to OpenJ9?</a></p>
<h2 id="compatible-options">Compatible options</h2>
<p>You can use the following command-line options in OpenJ9, just as you did in HotSpot; you can continue to use the HotSpot option in OpenJ9 without having to change your code:</p>
<table>
<thead>
<tr>
<th>Option</th>
<th>Usage</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="../x/"><code>-X</code></a></td>
<td>Displays help on nonstandard options.</td>
</tr>
<tr>
<td><a href="../xbootclasspath/"><code>-Xbootclasspath</code></a></td>
<td>Specifies the search path for bootstrap classes and resources.</td>
</tr>
<tr>
<td><a href="../xcheck/"><code>-Xcheck:jni</code></a></td>
<td>Runs additional checks for JNI functions during VM startup.</td>
</tr>
<tr>
<td><a href="../xfuture/"><code>-Xfuture</code></a></td>
<td>Turns on strict class-file format checks.</td>
</tr>
<tr>
<td><a href="../xint/"><code>-Xint</code></a></td>
<td>Runs an application in interpreted-only mode.</td>
</tr>
<tr>
<td><a href="../xmn/"><code>-Xmn</code></a></td>
<td>Sets the initial and maximum size of the new area when using -Xgcpolicy:gencon.</td>
</tr>
<tr>
<td><a href="../xms/"><code>-Xms</code></a></td>
<td>Sets the initial size of the heap. (Equivalent to <code>-XX:InitialHeapSize</code>)</td>
</tr>
<tr>
<td><a href="../xms/"><code>-Xmx</code></a></td>
<td>Specifies the maximum size of the object memory allocation pool. (Equivalent to <code>-XX:MaxHeapSize</code>)</td>
</tr>
<tr>
<td><a href="../xclassgc/"><code>-Xnoclassgc</code></a></td>
<td>Disables class garbage collection (GC).</td>
</tr>
<tr>
<td><a href="../xrs/"><code>-Xrs</code></a></td>
<td>Prevents the OpenJ9 run time environment from handling signals.</td>
</tr>
<tr>
<td><a href="../xss/"><code>-Xss</code></a></td>
<td>Sets the Java&trade; thread stack size. (Equivalent to <code>-XX:ThreadStackSize</code>). <i class="fa fa-pencil-square-o" aria-hidden="true"></i> <strong>Note:</strong> Unlike HotSpot, this option applies only to the Java stack. OpenJ9 has a separate native stack for operating system threads (see <a href="../xmso/"><code>-Xmso</code></a>)</td>
</tr>
<tr>
<td><a href="../xverify/"><code>-Xverify:mode</code></a></td>
<td>Enables or disables the verifier.</td>
</tr>
<tr>
<td><a href="../xxconcgcthreads/"><code>-XX:ConcGCThreads</code></a></td>
<td>Configures the number of GC mutator background threads.</td>
</tr>
<tr>
<td><a href="../xxcompactstrings/"><code>-XX:[+|-]CompactStrings</code></a></td>
<td>Enables/disables <code>String</code> compression</td>
</tr>
<tr>
<td><a href="../xxdisableexplicitgc/"><code>-XX:[+|-]DisableExplicitGC</code></a></td>
<td>Enables/disables <code>System.gc()</code> calls. (Alias for <a href="../xenableexplicitgc/"><code>-Xdisableexplicitgc</code> / <code>-Xenableexplicitgc</code></a>)</td>
</tr>
<tr>
<td><a href="../xxexitonoutofmemoryerror/"><code>-XX:[+|-]ExitOnOutOfMemoryError</code></a></td>
<td>Triggers VM shutdown on out-of-memory conditions.</td>
</tr>
<tr>
<td><a href="../xxheapdumponoutofmemory/"><code>-XX:[+|-]HeapDumpOnOutOfMemory</code></a></td>
<td>Enables/disables dumps on out-of-memory conditions.</td>
</tr>
<tr>
<td><a href="../xxheapdumppath/"><code>-XX:HeapDumpPath</code></a></td>
<td>Specifies a directory for all VM dumps including heap dumps, javacores, and system dumps. (Alias for <a href="../xdump/#syntax"><code>-Xdump:directory</code></a>)</td>
</tr>
<tr>
<td><a href="../xxignoreunrecognizedvmoptions/"><code>-XX:[+|-]IgnoreUnrecognizedVMOptions</code></a></td>
<td>Specifies whether to ignore unrecognized top-level VM options</td>
</tr>
<tr>
<td><a href="../xxinitialheapsize/"><code>-XX:InitialHeapSize</code></a></td>
<td>Sets the initial size of the heap. (Alias for <a href="../xms/"><code>-Xms</code></a>)</td>
</tr>
<tr>
<td><a href="../xxinitialrampercentage/"><code>-XX:InitialRAMPercentage</code></a></td>
<td>Sets the initial size of the Java heap as a percentage of total memory.</td>
</tr>
<tr>
<td><a href="../xxmaxdirectmemorysize/"><code>-XX:MaxDirectMemorySize</code></a></td>
<td>Sets a limit on the amount of memory that can be reserved for all direct byte buffers.</td>
</tr>
<tr>
<td><a href="../xxinitialheapsize/"><code>-XX:MaxHeapSize</code>    </a></td>
<td>Specifies the maximum size of the object memory allocation pool. (Alias for <a href="../xms/"><code>-Xmx</code></a>)</td>
</tr>
<tr>
<td><a href="../xxinitialrampercentage/"><code>-XX:MaxRAMPercentage</code></a></td>
<td>Sets the maximum size of the Java heap as a percentage of total memory.</td>
</tr>
<tr>
<td><a href="../xxonoutofmemoryerror/"><code>-XX:OnOutOfMemoryError</code></a></td>
<td>Runs specified commands when a <code>java.lang.OutOfMemoryError</code> is thrown. (Equivalent to <code>-Xdump:tool:events=systhrow,filter=java/lang/OutOfMemoryError,exec=</code>)</td>
</tr>
<tr>
<td><a href="../xxparallelcmsthreads/"><code>-XX:ParallelCMSThreads</code></a></td>
<td>Configures the number of GC mutator background threads.</td>
</tr>
<tr>
<td><a href="../xxparallelgcthreads/"><code>-XX:ParallelGCThreads</code></a></td>
<td>Configures the number of GC threads.</td>
</tr>
<tr>
<td><a href="../xxprintcodecache/"><code>-XX:[+|-]PrintCodeCache</code></a></td>
<td>Prints code cache usage when the application exits.</td>
</tr>
<tr>
<td><a href="../xxusecompressedoops/"><code>-XX:[+|-]UseCompressedOops</code></a></td>
<td>Disables compressed references in 64-bit JVMs. (See also <a href="../xcompressedrefs/"><code>-Xcompressedrefs</code></a>)</td>
</tr>
<tr>
<td><a href="../xxusecontainersupport/"><code>-XX:[+|-]UseContainerSupport</code></a></td>
<td>Sets a larger fraction of memory to the Java heap when the VM detects that it is running in a container.</td>
</tr>
</tbody>
</table>
<h2 id="equivalent-options">Equivalent options</h2>
<p>These HotSpot command-line options have equivalents in OpenJ9 that are not specified in the same way, but perform a related function:</p>
<table>
<thead>
<tr>
<th>HotSpot Option</th>
<th>OpenJ9 Option</th>
<th>Usage</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>-Xcomp</code></td>
<td><a href="../xjit/#count"><code>-Xjit:count=0</code></a><strong><sup>1</sup></strong></td>
<td><code>-Xcomp</code> disables interpreted method invocations.</td>
</tr>
<tr>
<td><code>-Xgc</code></td>
<td><a href="../xgcpolicy/"><code>-Xgcpolicy</code></a><strong><sup>2</sup></strong></td>
<td>Configuring your garbage collection policy.</td>
</tr>
<tr>
<td><code>-XX:+UseNUMA</code></td>
<td><a href="../xnumanone/"><code>-Xnuma:none</code></a><strong><sup>3</sup></strong></td>
<td>Controls non-uniform memory architecture (NUMA) awareness.</td>
</tr>
</tbody>
</table>
<p><i class="fa fa-pencil-square-o" aria-hidden="true"></i> <strong>Notes:</strong></p>
<ol>
<li>
<p>HotSpot uses <code>-Xcomp</code> to force compilation of methods on first invocation. However, this option is deprecated. Whilst it can be used for compatibility, using <code>-Xjit:count=0</code> is preferred.</p>
</li>
<li>
<p>HotSpot uses <code>-Xgc</code> to both select policies and configure them; OpenJ9 uses <code>-Xgcpolicy</code> to select policies, reserving <code>-Xgc</code> for configuration.</p>
</li>
<li>
<p>In HotSpot, NUMA awareness is turned off by default and is turned on by using the <code>-XX:+UseNUMA</code> option. Conversely, the OpenJ9 VM automatically enables NUMA awareness and uses <code>-Xnuma:none</code> to turn it <em>off</em>.</p>
<ul>
<li>If you were previously using HotSpot in its default mode, you must now explicitly turn off NUMA awareness in OpenJ9.</li>
<li>If you are used to using <code>-XX:+UseNUMA</code> in HotSpot, you no longer need to explicitly turn on NUMA awareness; it's on by default.</li>
</ul>
</li>
</ol>
<h2 id="creating-compatible-behavior">Creating compatible behavior</h2>
<p>You can set the following options to make OpenJ9 behave in the same way as Hotspot.</p>
<table>
<thead>
<tr>
<th>Option</th>
<th>Usage</th>
</tr>
</thead>
<tbody>
<tr>
<td><img alt="Start of content that applies only to Java 8 (LTS)" src="../cr/java8.png" /> <a href="../djavalangstringsubstringnocopy/"><code>-Djava.lang.string.substring.nocopy=true</code></a></td>
<td>Avoid String sharing by String.substring(). <img alt="End of content that applies only to Java 8" src="../cr/java_close_lts.png" /></td>
</tr>
<tr>
<td><a href="../xnumanone/"><code>-Xnuma:none</code></a></td>
<td>Disable non-uniform memory architecture (NUMA) awareness.</td>
</tr>
</tbody>
</table>
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