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<h2 title="Interface MemoryMXBean" class="title">Interface MemoryMXBean</h2>
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<dt>All Superinterfaces:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">MemoryMXBean</a></code>, <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/PlatformManagedObject.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">PlatformManagedObject</a></code></dd>
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<dt>All Known Implementing Classes:</dt>
<dd><code><a href="internal/ExtendedMemoryMXBeanImpl.html" title="class in com.ibm.lang.management.internal">ExtendedMemoryMXBeanImpl</a></code></dd>
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<pre>public interface <span class="typeNameLabel">MemoryMXBean</span>
extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">MemoryMXBean</a></pre>
<div class="block">The OpenJ9 extension interface for monitoring the virtual machine's memory
management system.</div>
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<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.5</dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCurrentGCThreads()">getCurrentGCThreads</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the number of GC worker threads that participated in the most recent collection.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getGCMainThreadCpuUsed()">getGCMainThreadCpuUsed</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the amount of CPU time spent in the GC by the main thread, in
milliseconds.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getGCMasterThreadCpuUsed()">getGCMasterThreadCpuUsed</a></span>()</code></th>
<td class="colLast">
<div class="block"><span class="deprecatedLabel">Deprecated, for removal: This API element is subject to removal in a future version.</span>
<div class="deprecationComment">renamed to getGCMainThreadCpuUsed</div>
</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getGCMode()">getGCMode</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the current GC mode as a human-readable string.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getGCSlaveThreadsCpuUsed()">getGCSlaveThreadsCpuUsed</a></span>()</code></th>
<td class="colLast">
<div class="block"><span class="deprecatedLabel">Deprecated, for removal: This API element is subject to removal in a future version.</span>
<div class="deprecationComment">renamed to getGCWorkerThreadsCpuUsed</div>
</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getGCWorkerThreadsCpuUsed()">getGCWorkerThreadsCpuUsed</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the total amount of CPU time spent in the GC by all worker threads,
in milliseconds.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMaxHeapSize()">getMaxHeapSize</a></span>()</code></th>
<td class="colLast">
<div class="block">Get the current maximum heap size in bytes.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMaxHeapSizeLimit()">getMaxHeapSizeLimit</a></span>()</code></th>
<td class="colLast">
<div class="block">Get the maximum size in bytes to which the max heap size could be
increased in the currently running VM.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMaximumGCThreads()">getMaximumGCThreads</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the maximum number of GC worker threads.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMinHeapSize()">getMinHeapSize</a></span>()</code></th>
<td class="colLast">
<div class="block">Get the minimum heap size in bytes.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheFreeSpace()">getSharedClassCacheFreeSpace</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the <b>free space</b> in bytes of the cache that the JVM is
currently connected to.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheMaxAotBytes()">getSharedClassCacheMaxAotBytes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the maximum space allowed for AOT data of the cache that the JVM is currently
connected to.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheMaxAotUnstoredBytes()">getSharedClassCacheMaxAotUnstoredBytes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the bytes which are not stored into the shared classes cache due to the current setting of maximum space allowed for AOT data.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheMaxJitDataBytes()">getSharedClassCacheMaxJitDataBytes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the maximum space allowed for JIT data of the cache that the JVM is currently
connected to.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheMaxJitDataUnstoredBytes()">getSharedClassCacheMaxJitDataUnstoredBytes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the bytes which are not stored into the shared classes cache due to the current setting of maximum space allowed for JIT data.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheMinAotBytes()">getSharedClassCacheMinAotBytes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the minimum space reserved for AOT data of the cache that the JVM is currently
connected to.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheMinJitDataBytes()">getSharedClassCacheMinJitDataBytes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the minimum space reserved for JIT data of the cache that the JVM is currently
connected to.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheSize()">getSharedClassCacheSize</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the total size in bytes of the cache that the JVM is currently
connected to.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheSoftmxBytes()">getSharedClassCacheSoftmxBytes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the softmx size in bytes of the cache that the JVM is currently
connected to.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSharedClassCacheSoftmxUnstoredBytes()">getSharedClassCacheSoftmxUnstoredBytes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the bytes which are not stored into the shared classes cache due to the current setting of softmx in shared classes.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isSetMaxHeapSizeSupported()">isSetMaxHeapSizeSupported</a></span>()</code></th>
<td class="colLast">
<div class="block">Query whether the VM supports runtime reconfiguration of the
maximum heap size through the setMaxHeapSize() call.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setMaxHeapSize(long)">setMaxHeapSize</a></span>&#8203;(long&nbsp;size)</code></th>
<td class="colLast">
<div class="block">Set the current maximum heap size to <code>size</code>.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setSharedClassCacheMaxAotBytes(long)">setSharedClassCacheMaxAotBytes</a></span>&#8203;(long&nbsp;value)</code></th>
<td class="colLast">
<div class="block">Set the maximum shared classes cache space allowed for AOT data to <code>value</code> bytes.</div>
</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setSharedClassCacheMaxJitDataBytes(long)">setSharedClassCacheMaxJitDataBytes</a></span>&#8203;(long&nbsp;value)</code></th>
<td class="colLast">
<div class="block">Set the maximum shared classes cache space allowed for JIT data to <code>value</code> bytes.</div>
</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setSharedClassCacheMinAotBytes(long)">setSharedClassCacheMinAotBytes</a></span>&#8203;(long&nbsp;value)</code></th>
<td class="colLast">
<div class="block">Set the minimum shared classes cache space reserved for AOT data to <code>value</code> bytes.</div>
</td>
</tr>
<tr id="i25" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setSharedClassCacheMinJitDataBytes(long)">setSharedClassCacheMinJitDataBytes</a></span>&#8203;(long&nbsp;value)</code></th>
<td class="colLast">
<div class="block">Set the minimum shared classes cache space reserved for JIT data to <code>value</code> bytes.</div>
</td>
</tr>
<tr id="i26" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setSharedClassCacheSoftmxBytes(long)">setSharedClassCacheSoftmxBytes</a></span>&#8203;(long&nbsp;value)</code></th>
<td class="colLast">
<div class="block">Set the shared class softmx size to <code>value</code>.</div>
</td>
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<h3>Methods declared in interface&nbsp;java.lang.management.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">MemoryMXBean</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true#gc()" title="class or interface in java.lang.management" class="externalLink" target="_blank">gc</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true#getHeapMemoryUsage()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getHeapMemoryUsage</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true#getNonHeapMemoryUsage()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getNonHeapMemoryUsage</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true#getObjectPendingFinalizationCount()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getObjectPendingFinalizationCount</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true#isVerbose()" title="class or interface in java.lang.management" class="externalLink" target="_blank">isVerbose</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html?is-external=true#setVerbose(boolean)" title="class or interface in java.lang.management" class="externalLink" target="_blank">setVerbose</a></code></li>
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<h3>Methods declared in interface&nbsp;java.lang.management.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/PlatformManagedObject.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">PlatformManagedObject</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/PlatformManagedObject.html?is-external=true#getObjectName()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getObjectName</a></code></li>
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<h4>getMaxHeapSizeLimit</h4>
<pre class="methodSignature">long&nbsp;getMaxHeapSizeLimit()</pre>
<div class="block">Get the maximum size in bytes to which the max heap size could be
increased in the currently running VM. This may be larger than the
current max heap size.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>value of -Xmx in bytes</dd>
</dl>
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<h4>getMaxHeapSize</h4>
<pre class="methodSignature">long&nbsp;getMaxHeapSize()</pre>
<div class="block">Get the current maximum heap size in bytes.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>current value of -Xsoftmx in bytes</dd>
</dl>
</li>
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<pre class="methodSignature">long&nbsp;getMinHeapSize()</pre>
<div class="block">Get the minimum heap size in bytes.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>value of -Xms in bytes</dd>
</dl>
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<pre class="methodSignature">void&nbsp;setMaxHeapSize&#8203;(long&nbsp;size)</pre>
<div class="block">Set the current maximum heap size to <code>size</code>.
The parameter specifies the max heap size in bytes and must be
between getMinHeapSize() and getMaxHeapSizeLimit().
See -Xsoftmx in the command line reference for additional
details on the effect of setting softmx.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>size</code> - new -Xsoftmx value in bytes</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">UnsupportedOperationException</a></code> - if this operation is not supported.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">IllegalArgumentException</a></code> - if input value <code>size</code> is either less than
getMinHeapSize() or greater than getMaxHeapSizeLimit().</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">SecurityException</a></code> - if a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityManager.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank"><code>SecurityManager</code></a> is being used and the caller
does not have the <code>ManagementPermission</code> value
of "control".</dd>
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<pre class="methodSignature">boolean&nbsp;isSetMaxHeapSizeSupported()</pre>
<div class="block">Query whether the VM supports runtime reconfiguration of the
maximum heap size through the setMaxHeapSize() call.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if setMaxHeapSize is supported, false otherwise</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheSize()</pre>
<div class="block">Returns the total size in bytes of the cache that the JVM is currently
connected to.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of bytes in the shared class cache.</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheSoftmxBytes()</pre>
<div class="block">Returns the softmx size in bytes of the cache that the JVM is currently
connected to.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the softmx bytes in the shared class cache or cache size if it is not set.</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheMinAotBytes()</pre>
<div class="block">Returns the minimum space reserved for AOT data of the cache that the JVM is currently
connected to.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the minimum shared classes cache space reserved for AOT data in bytes or -1 if it is not set.</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheMaxAotBytes()</pre>
<div class="block">Returns the maximum space allowed for AOT data of the cache that the JVM is currently
connected to.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maximum shared classes cache space allowed for AOT data or -1 if it is not set.</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheMinJitDataBytes()</pre>
<div class="block">Returns the minimum space reserved for JIT data of the cache that the JVM is currently
connected to.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the minimum shared classes cache space reserved for JIT data or -1 if it is not set.</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheMaxJitDataBytes()</pre>
<div class="block">Returns the maximum space allowed for JIT data of the cache that the JVM is currently
connected to.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maximum shared classes cache space allowed for JIT data or -1 if it is not set.</dd>
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<pre class="methodSignature">boolean&nbsp;setSharedClassCacheSoftmxBytes&#8203;(long&nbsp;value)</pre>
<div class="block">Set the shared class softmx size to <code>value</code>.
The parameter specifies the softmx in bytes.
See -Xscmx in the command line reference for additional
details on the effect of setting shared class softmx.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - new shared cache soft max value in bytes</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the requested operation has been completed.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">IllegalArgumentException</a></code> - if input value <code>value</code> is less than 0.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">SecurityException</a></code> - if a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityManager.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank"><code>SecurityManager</code></a> is being used and the caller
does not have the <code>ManagementPermission</code> value
of "control".</dd>
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<pre class="methodSignature">boolean&nbsp;setSharedClassCacheMinAotBytes&#8203;(long&nbsp;value)</pre>
<div class="block">Set the minimum shared classes cache space reserved for AOT data to <code>value</code> bytes.
See -Xscminaot in the command line reference for additional
details on the effect of setting shared class -Xscminaot.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - new -Xscminaot value in bytes</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the requested operation has been completed.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">IllegalArgumentException</a></code> - if input value <code>value</code> is less than 0.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">SecurityException</a></code> - if a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityManager.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank"><code>SecurityManager</code></a> is being used and the caller
does not have the <code>ManagementPermission</code> value
of "control".</dd>
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<pre class="methodSignature">boolean&nbsp;setSharedClassCacheMaxAotBytes&#8203;(long&nbsp;value)</pre>
<div class="block">Set the maximum shared classes cache space allowed for AOT data to <code>value</code> bytes.
See -Xscmaxaot in the command line reference for additional
details on the effect of setting shared class -Xscmaxaot.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - new -Xscmaxaot value in bytes</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the requested operation has been completed.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">IllegalArgumentException</a></code> - if input value <code>value</code> is less than 0.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">SecurityException</a></code> - if a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityManager.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank"><code>SecurityManager</code></a> is being used and the caller
does not have the <code>ManagementPermission</code> value
of "control".</dd>
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<pre class="methodSignature">boolean&nbsp;setSharedClassCacheMinJitDataBytes&#8203;(long&nbsp;value)</pre>
<div class="block">Set the minimum shared classes cache space reserved for JIT data to <code>value</code> bytes.
See -Xscminjitdata in the command line reference for additional
details on the effect of setting shared class -Xscminjitdata.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - new -Xscminjitdata value in bytes</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the requested operation has been completed.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">IllegalArgumentException</a></code> - if input value <code>value</code> is less than 0.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">SecurityException</a></code> - if a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityManager.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank"><code>SecurityManager</code></a> is being used and the caller
does not have the <code>ManagementPermission</code> value
of "control".</dd>
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<pre class="methodSignature">boolean&nbsp;setSharedClassCacheMaxJitDataBytes&#8203;(long&nbsp;value)</pre>
<div class="block">Set the maximum shared classes cache space allowed for JIT data to <code>value</code> bytes.
See -Xscmaxjitdata in the command line reference for additional
details on the effect of setting shared class -Xscmaxjitdata.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - new -Xscmaxjitdata value in bytes</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the requested operation has been completed.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">IllegalArgumentException</a></code> - if input value <code>value</code> is less than 0.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">SecurityException</a></code> - if a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/SecurityManager.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank"><code>SecurityManager</code></a> is being used and the caller
does not have the <code>ManagementPermission</code> value
of "control".</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheSoftmxUnstoredBytes()</pre>
<div class="block">Returns the bytes which are not stored into the shared classes cache due to the current setting of softmx in shared classes.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the unstored bytes.</dd>
</dl>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheMaxAotUnstoredBytes()</pre>
<div class="block">Returns the bytes which are not stored into the shared classes cache due to the current setting of maximum space allowed for AOT data.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the unstored bytes.</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheMaxJitDataUnstoredBytes()</pre>
<div class="block">Returns the bytes which are not stored into the shared classes cache due to the current setting of maximum space allowed for JIT data.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the unstored bytes.</dd>
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<pre class="methodSignature">long&nbsp;getSharedClassCacheFreeSpace()</pre>
<div class="block">Returns the <b>free space</b> in bytes of the cache that the JVM is
currently connected to.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of bytes free in the shared class cache.</dd>
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<h4>getGCMode</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a>&nbsp;getGCMode()</pre>
<div class="block">Returns the current GC mode as a human-readable string.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a String describing the mode the GC is currently operating in</dd>
</dl>
</li>
</ul>
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<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">@Deprecated</a>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true#forRemoval()" title="class or interface in java.lang" class="externalLink" target="_blank">forRemoval</a>=true,
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true#since()" title="class or interface in java.lang" class="externalLink" target="_blank">since</a>="15")
long&nbsp;getGCMasterThreadCpuUsed()</pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated, for removal: This API element is subject to removal in a future version.</span>
<div class="deprecationComment">renamed to getGCMainThreadCpuUsed</div>
</div>
<div class="block">Returns the amount of CPU time spent in the GC by the master thread, in
milliseconds.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>CPU time used in milliseconds</dd>
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<pre class="methodSignature">long&nbsp;getGCMainThreadCpuUsed()</pre>
<div class="block">Returns the amount of CPU time spent in the GC by the main thread, in
milliseconds.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>CPU time used in milliseconds</dd>
</dl>
</li>
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<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">@Deprecated</a>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true#forRemoval()" title="class or interface in java.lang" class="externalLink" target="_blank">forRemoval</a>=true,
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true#since()" title="class or interface in java.lang" class="externalLink" target="_blank">since</a>="15")
long&nbsp;getGCSlaveThreadsCpuUsed()</pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated, for removal: This API element is subject to removal in a future version.</span>
<div class="deprecationComment">renamed to getGCWorkerThreadsCpuUsed</div>
</div>
<div class="block">Returns the total amount of CPU time spent in the GC by all slave threads, in
milliseconds.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>CPU time used in milliseconds</dd>
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<pre class="methodSignature">long&nbsp;getGCWorkerThreadsCpuUsed()</pre>
<div class="block">Returns the total amount of CPU time spent in the GC by all worker threads,
in milliseconds.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>CPU time used in milliseconds</dd>
</dl>
</li>
</ul>
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<h4>getMaximumGCThreads</h4>
<pre class="methodSignature">int&nbsp;getMaximumGCThreads()</pre>
<div class="block">Returns the maximum number of GC worker threads.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>maximum number of GC worker threads</dd>
</dl>
</li>
</ul>
<a id="getCurrentGCThreads()">
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<h4>getCurrentGCThreads</h4>
<pre class="methodSignature">int&nbsp;getCurrentGCThreads()</pre>
<div class="block">Returns the number of GC worker threads that participated in the most recent collection.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>number of active GC worker threads</dd>
</dl>
</li>
</ul>
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