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  <li class="md-nav__item">
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      -Dcom.ibm.tools.attach.timeout
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  <li class="md-nav__item">
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      -Dfile.encoding
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      -Djava.compiler
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      -Djava.lang.string.substring.nocopy
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  <li class="md-nav__item">
    <a href="../djdknativecbc/" title="-Djdk.nativeCBC" class="md-nav__link">
      -Djdk.nativeCBC
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  <li class="md-nav__item">
    <a href="../djdknativechacha20/" title="-Djdk.nativeChaCha20" class="md-nav__link">
      -Djdk.nativeChaCha20
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  <li class="md-nav__item">
    <a href="../djdknativecrypto/" title="-Djdk.nativeCrypto" class="md-nav__link">
      -Djdk.nativeCrypto
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  <li class="md-nav__item">
    <a href="../djdknativedigest/" title="-Djdk.nativeDigest" class="md-nav__link">
      -Djdk.nativeDigest
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  <li class="md-nav__item">
    <a href="../djdknativegcm/" title="-Djdk.nativeGCM" class="md-nav__link">
      -Djdk.nativeGCM
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  <li class="md-nav__item">
    <a href="../djdknativersa/" title="-Djdk.nativeRSA" class="md-nav__link">
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      -X
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      -Xaggressive
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  <li class="md-nav__item">
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      -Xalwaysclassgc
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  <li class="md-nav__item">
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      -Xcodecachetotal
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      -Xcomp
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      -Xcompactexplicitgc
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      -Xconcurrentlevel
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      -Xdisableexcessivegc
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  </li>

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

        
  <li class="md-nav__item">
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      -Xdisablejavadump
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  <li class="md-nav__item">
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      -Xdisablestringconstantgc
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  <li class="md-nav__item">
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      -Xdump
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      -Xenableexplicitgc
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      -Xfuture
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      -Xgc
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      -Xgc:splitheap
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      -Xgcpolicy
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      -Xgcthreads
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  </li>

        
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      -Xgcworkpackets
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      -Xifa
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      -Xint
    </a>
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      -Xiss
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      -Xjit
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      -Xjni
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      -Xlinenumbers
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      -Xloa
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      -Xloainitial
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    <a href="../xloaminimum/" title="-Xloamaximum" class="md-nav__link">
      -Xloamaximum
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    <a href="../xloaminimum/" title="-Xloaminimum" class="md-nav__link">
      -Xloaminimum
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      -XlockReservation
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      -Xlockword
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      -Xlog
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  <li class="md-nav__item">
    <a href="../xlp/" title="-Xlp" class="md-nav__link">
      -Xlp
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  <li class="md-nav__item">
    <a href="../xlpcodecache/" title="-Xlp:codecache" class="md-nav__link">
      -Xlp:codecache
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  <li class="md-nav__item">
    <a href="../xlpobjectheap/" title="-Xlp:objectheap" class="md-nav__link">
      -Xlp:objectheap
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  <li class="md-nav__item">
    <a href="../xmine/" title="-Xmaxe" class="md-nav__link">
      -Xmaxe
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  <li class="md-nav__item">
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      -Xmaxf
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      -Xmaxt
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  <li class="md-nav__item">
    <a href="../xmca/" title="-Xmca" class="md-nav__link">
      -Xmca
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      -Xmco
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      -Xmcrs
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  <li class="md-nav__item">
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      -Xmine
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  <li class="md-nav__item">
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      -Xminf
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  <li class="md-nav__item">
    <a href="../xmint/" title="-Xmint" class="md-nav__link">
      -Xmint
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  <li class="md-nav__item">
    <a href="../xmn/" title="-Xmn" class="md-nav__link">
      -Xmn
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  <li class="md-nav__item">
    <a href="../xmn/" title="-Xmns" class="md-nav__link">
      -Xmns
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    <a href="../xmn/" title="-Xmnx" class="md-nav__link">
      -Xmnx
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  <li class="md-nav__item">
    <a href="../xmo/" title="-Xmo" class="md-nav__link">
      -Xmo
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  <li class="md-nav__item">
    <a href="../xmo/" title="-Xmoi" class="md-nav__link">
      -Xmoi
    </a>
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  <li class="md-nav__item">
    <a href="../xmo/" title="-Xmos" class="md-nav__link">
      -Xmos
    </a>
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  <li class="md-nav__item">
    <a href="../xmo/" title="-Xmox" class="md-nav__link">
      -Xmox
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  <li class="md-nav__item">
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      -Xmr
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  <li class="md-nav__item">
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      -Xmrx
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  <li class="md-nav__item">
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      -Xms
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      -Xmso
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      -Xmx
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  <li class="md-nav__item">
    <a href="../xaot/" title="-Xnoaot" class="md-nav__link">
      -Xnoaot
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  <li class="md-nav__item">
    <a href="../xclassgc/" title="-Xnoclassgc" class="md-nav__link">
      -Xnoclassgc
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  <li class="md-nav__item">
    <a href="../xcompactexplicitgc/" title="-Xnocompactexplicitgc" class="md-nav__link">
      -Xnocompactexplicitgc
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  <li class="md-nav__item">
    <a href="../xcompactgc/" title="-Xnocompactgc" class="md-nav__link">
      -Xnocompactgc
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  <li class="md-nav__item">
    <a href="../xcompressedrefs/" title="-Xnocompressedrefs" class="md-nav__link">
      -Xnocompressedrefs
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  <li class="md-nav__item">
    <a href="../xjit/" title="-Xnojit" class="md-nav__link">
      -Xnojit
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    <a href="../xlinenumbers/" title="-Xnolinenumbers" class="md-nav__link">
      -Xnolinenumbers
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  <li class="md-nav__item">
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      -Xnoloa
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  <li class="md-nav__item">
    <a href="../xsigcatch/" title="-Xnosigcatch" class="md-nav__link">
      -Xnosigcatch
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  <li class="md-nav__item">
    <a href="../xsigchain/" title="-Xnosigchain" class="md-nav__link">
      -Xnosigchain
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  <li class="md-nav__item">
    <a href="../xnumanone/" title="-Xnuma:none" class="md-nav__link">
      -Xnuma:none
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  <li class="md-nav__item">
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      -Xoptionsfile
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      -Xquickstart
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      -Xrs
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  <li class="md-nav__item">
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      -XsamplingExpirationTime
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      -Xscdmx
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      -Xscmaxaot
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  <li class="md-nav__item">
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      -Xscmaxjitdata
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  <li class="md-nav__item">
    <a href="../xscminaot/" title="-Xscminaot" class="md-nav__link">
      -Xscminaot
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  <li class="md-nav__item">
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      -Xscminjitdata
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      -Xscmx
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      -Xshareclasses
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  <li class="md-nav__item">
    <a href="../xsigcatch/" title="-Xsigcatch" class="md-nav__link">
      -Xsigcatch
    </a>
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  <li class="md-nav__item">
    <a href="../xsigchain/" title="-Xsigchain" class="md-nav__link">
      -Xsigchain
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  <li class="md-nav__item">
    <a href="../xsignal/" title="-Xsignal" class="md-nav__link">
      -Xsignal
    </a>
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  <li class="md-nav__item">
    <a href="../xsoftmx/" title="-Xsoftmx" class="md-nav__link">
      -Xsoftmx
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    <a href="../xsoftrefthreshold/" title="-Xsoftrefthreshold" class="md-nav__link">
      -Xsoftrefthreshold
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      -Xss
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      -Xssi
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<h1 id="-xthr">-Xthr</h1>
<h2 id="syntax">Syntax</h2>
<pre><code>    -Xthr:&lt;parameter&gt;
</code></pre>
<h2 id="parameters">Parameters</h2>
<h3 id="adaptspin-noadaptspin"><code>AdaptSpin</code> | <code>noAdaptSpin</code></h3>
<pre><code>    -Xthr:AdaptSpin
    -Xthr:noAdaptSpin
</code></pre>
<dl>
<dd>This tuning option is available to test whether performance optimizations are negatively impacting an application.</dd>
</dl>
<h3 id="fastnotify-nofastnotify"><code>fastNotify</code> | <code>noFastNotify</code></h3>
<pre><code>    -Xthr:fastNotify
    -Xthr:noFastNotify
</code></pre>
<dl>
<dd>When a large number of threads try to acquire a Java&trade; monitor, throughput of an application can be reduced. This issue is known as high contention. If high contention occurs when the Java <code>wait</code> and <code>notify</code> features are regularly used, you can use <code>-Xthr:fastNotify</code> to increase throughput. However, <code>-Xthr:noFastNotify</code> is the default setting, because it is faster in all other scenarios.</dd>
</dl>
<h3 id="cfsyield-nocfsyield-linux-only"><code>cfsYield</code> | <code>noCfsYield</code> (Linux&reg; only)</h3>
<pre><code>    -Xthr:cfsYield
    -Xthr:noCfsYield
</code></pre>
<dl>
<dd>The default value, <code>cfsYield</code>, enables threading optimizations for running on Linux with the Completely Fair Scheduler (CFS) in the default mode (<code>sched_compat_yield=0</code>). The <code>noCfsYield</code> value disables these threading optimizations. You might want to use the <code>noCfsYield</code> value if your application uses the <code>Thread.yield()</code> method extensively, because otherwise you might see a performance decrease in cases where yielding is not beneficial.</dd>
</dl>
<h3 id="minimizeusercpu"><code>minimizeUserCPU</code></h3>
<pre><code>    -Xthr:minimizeUserCPU
</code></pre>
<dl>
<dd>Minimizes user-mode CPU usage in thread synchronization where possible. The reduction in CPU usage might be a trade-off in exchange for decreased performance.</dd>
</dl>
<h3 id="secondaryspinforobjectmonitors-nosecondaryspinforobjectmonitors"><code>secondarySpinForObjectMonitors</code> | <code>noSecondarySpinForObjectMonitors</code></h3>
<pre><code>    -Xthr:secondarySpinForObjectMonitors
    -Xthr:noSecondarySpinForObjectMonitors
</code></pre>
<dl>
<dd>This tuning option is available to test whether performance optimizations are negatively impacting an application.</dd>
</dl>
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