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<h2 title="Interface MemoryPoolMXBean" class="title">Interface MemoryPoolMXBean</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/MemoryPoolMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">MemoryPoolMXBean</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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<dd><code><a href="internal/MemoryPoolMXBeanImpl.html" title="class in com.ibm.lang.management.internal">MemoryPoolMXBeanImpl</a></code></dd>
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<pre>public interface <span class="typeNameLabel">MemoryPoolMXBean</span>
extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">MemoryPoolMXBean</a></pre>
<div class="block">The OpenJ9 interface for managing and monitoring the virtual machine's memory pools.
The following list describes 4 common behavior changes for <a href="MemoryPoolMXBean.html" title="interface in com.ibm.lang.management"><code>MemoryPoolMXBean</code></a>.
You can revert to the earlier implementation of <a href="MemoryPoolMXBean.html" title="interface in com.ibm.lang.management"><code>MemoryPoolMXBean</code></a> by setting the
<b>-XX:+HeapManagementMXBeanCompatibility</b> Java command line option.
<h2>1. More detailed heap memory pools can be obtained by calling <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/ManagementFactory.html?is-external=true#getMemoryPoolMXBeans()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>ManagementFactory.getMemoryPoolMXBeans()</code></a></h2>
The following names are reported for heap memory pools, listed by garbage collection policy:
<br><br>
For <b>-Xgcpolicy:gencon</b>
<ul>
<li><b>nursery-allocate</b>
<li><b>nursery-survivor</b>
<li><b>tenured-LOA</b>
<li><b>tenured-SOA</b>
</ul>
<br>
For <b>-Xgcpolicy:optthruput</b> and <b>-Xgcpolicy:optavgpause</b>
<ul>
<li><b>tenured-LOA</b>
<li><b>tenured-SOA</b>
</ul>
<br>
For <b>-Xgcpolicy:balanced</b>
<ul>
<li><b>balanced-reserved</b>
<li><b>balanced-eden</b>
<li><b>balanced-survivor</b>
<li><b>balanced-old</b>
</ul>
<br>
For <b>-Xgcpolicy:metronome</b>
<ul>
<li><b>JavaHeap</b>
</ul>
<br><p>
If you set the <b>-XX:+HeapManagementMXBeanCompatibility</b> option to turn on compatibility with earlier versions of the VM,
information about heap memory pools is reported in the older format.
<br>
The following name is reported for the heap memory pool for all garbage collection policies in the old format:
<ul>
<li><b>Java heap</b>
</ul>
<h2>2. Memory Usage</h2>
Memory usage for each heap memory pool can be retrieved by using <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getUsage()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.getUsage()</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getCollectionUsage()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.getCollectionUsage()</code></a>.
In some cases the total sum of memory usage of all heap memory pools is more than the maximum heap size.
This irregularity can be caused if data for each pool is collected between garbage collection cycles,
where objects have been moved or reclaimed.
If you want to collect memory usage data that is synchronized across the memory pools, use the
<a href="../../../sun/management/GarbageCollectionNotificationInfo.html" title="class in com.sun.management"><code>GarbageCollectionNotificationInfo</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/jdk.management/com/sun/management/GarbageCollectorMXBean.html?is-external=true#getLastGcInfo()" title="class or interface in com.sun.management" class="externalLink" target="_blank"><code>GarbageCollectorMXBean.getLastGcInfo()</code></a> extensions.
<h2>3. Usage Threshold (<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getUsageThreshold()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.getUsageThreshold()</code></a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#setUsageThreshold(long)" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.setUsageThreshold(long)</code></a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isUsageThresholdExceeded()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.isUsageThresholdExceeded()</code></a>)</h2>
The usage threshold attribute is designed for monitoring the increasing trend of memory usage and incurs only a low overhead.
This attribute is not appropriate for some memory pools.
Use the <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isUsageThresholdSupported()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.isUsageThresholdSupported()</code></a> method to determine
if this functionality is supported by the memory pool to avoid an unexpected <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"><code>UnsupportedOperationException</code></a>.
<br>
The following names are reported for heap memory pools that support the usage threshold attribute:
<ul>
<li><b>JavaHeap</b>
<li><b>tenured</b>
<li><b>tenured-LOA</b>
<li><b>tenured-SOA</b>
<li><b>balanced-survivor</b>
<li><b>balanced-old</b>
</ul>
<h2>4. Collection Usage Threshold (<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getCollectionUsageThreshold()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.getCollectionUsageThreshold()</code></a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#setCollectionUsageThreshold(long)" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.setCollectionUsageThreshold(long)</code></a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isCollectionUsageThresholdExceeded()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.isCollectionUsageThresholdExceeded()</code></a>)</h2>
The collection usage threshold is a manageable attribute that is applicable only to some garbage-collected memory pools.
This attribute reports the amount of memory taken up by objects that are still in use after a garbage collection cycle.
Use the <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isCollectionUsageThresholdSupported()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryPoolMXBean.isCollectionUsageThresholdSupported()</code></a> method to determine
if this functionality is supported by the memory pool to avoid an unexpected <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"><code>UnsupportedOperationException</code></a>.
<br>
The following names are reported for heap memory pools that support the collection usage threshold attribute:
<ul>
<li><b>JavaHeap</b>
<li><b>tenured</b>
<li><b>tenured-LOA</b>
<li><b>tenured-SOA</b>
<li><b>nursery-allocate</b>
<li><b>balanced-eden</b>
<li><b>balanced-survivor</b>
<li><b>balanced-old</b>
</ul>
<br>
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<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.5</dd>
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<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryUsage.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">MemoryUsage</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getPreCollectionUsage()">getPreCollectionUsage</a></span>()</code></th>
<td class="colLast">
<div class="block">If supported by the virtual machine, returns a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryUsage.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryUsage</code></a> which
encapsulates this memory pool's memory usage <em>before</em> the most
recent run of the garbage collector.</div>
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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/MemoryPoolMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">MemoryPoolMXBean</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getCollectionUsage()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getCollectionUsage</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getCollectionUsageThreshold()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getCollectionUsageThreshold</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getCollectionUsageThresholdCount()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getCollectionUsageThresholdCount</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getMemoryManagerNames()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getMemoryManagerNames</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getName()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getName</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getPeakUsage()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getPeakUsage</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getType()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getType</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getUsage()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getUsage</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getUsageThreshold()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getUsageThreshold</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#getUsageThresholdCount()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getUsageThresholdCount</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isCollectionUsageThresholdExceeded()" title="class or interface in java.lang.management" class="externalLink" target="_blank">isCollectionUsageThresholdExceeded</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isCollectionUsageThresholdSupported()" title="class or interface in java.lang.management" class="externalLink" target="_blank">isCollectionUsageThresholdSupported</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isUsageThresholdExceeded()" title="class or interface in java.lang.management" class="externalLink" target="_blank">isUsageThresholdExceeded</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isUsageThresholdSupported()" title="class or interface in java.lang.management" class="externalLink" target="_blank">isUsageThresholdSupported</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#isValid()" title="class or interface in java.lang.management" class="externalLink" target="_blank">isValid</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#resetPeakUsage()" title="class or interface in java.lang.management" class="externalLink" target="_blank">resetPeakUsage</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#setCollectionUsageThreshold(long)" title="class or interface in java.lang.management" class="externalLink" target="_blank">setCollectionUsageThreshold</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html?is-external=true#setUsageThreshold(long)" title="class or interface in java.lang.management" class="externalLink" target="_blank">setUsageThreshold</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>getPreCollectionUsage</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryUsage.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">MemoryUsage</a>&nbsp;getPreCollectionUsage()</pre>
<div class="block">If supported by the virtual machine, returns a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryUsage.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryUsage</code></a> which
encapsulates this memory pool's memory usage <em>before</em> the most
recent run of the garbage collector. No garbage collection will be
actually occur as a result of this method getting called.
<p>
The method will return a <code>null</code> if the virtual machine does
not support this type of functionality.
</p>
MBeanServer access:<br>
The return value will be mapped to a
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/javax/management/openmbean/CompositeData.html?is-external=true" title="class or interface in javax.management.openmbean" class="externalLink" target="_blank"><code>CompositeData</code></a> with attributes as
specified in <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryUsage.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryUsage</code></a>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryUsage.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>MemoryUsage</code></a> containing the usage details for the memory
pool just before the most recent collection occurred.</dd>
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