<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
Out of Memory Error with ConcurrentReaderHashMap on Jboss 5.1.0
</h3>
<span style="margin-bottom: 10px;">
created by <a href="http://community.jboss.org/people/amathewjboss1">Anil Mathew</a> in <i>JBoss Remoting</i> - <a href="http://community.jboss.org/message/626575#626575">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>   We are running on JBoss 5.1 / JDK 1.6 on Linux servers. During very high load we are seeing Out of Memory Error and it seems like related to the JBoss remoting. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>   We took a heap dump and the Memory Analyzer shows the below instance is taking 25% of the memory:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>One instance of <strong>"org.jboss.mx.server.MBeanServerImpl"</strong> loaded by <strong>"org.jboss.classloader.spi.base.BaseClassLoader @ 0x415b2fc8"</strong> occupies <strong>65,055,032 (24.64%)</strong> bytes. The memory is accumulated in one instance of <strong>"EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap$Entry[]"</strong> loaded by <strong>"org.jboss.bootstrap.NoAnnotationURLClassLoader @ 0x42f8ba78"</strong>.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  The details which is pointing ot the JBoss remoting classes:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Class Name                                                                                                                                                Shallow Heap Retained Heap </p><ol start="1" style="list-style-type: upper-alpha;"><li>EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap$Entry[2048]  Shallow Heap => 8,208    Retained Heap => 45,693,888 </li></ol><p>   EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap   Shallow Heap => 56      Retained Heap => 45,761,640 </p><p>      EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap$Entry Shallow Heap => 24                Retained Heap => 45,761,688 </p><p>          EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap$Entry[64] Shallow Heap => 272                Retained Heap => 64,584,776 </p><p>             EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap Shallow Heap => 56                Retained Heap => 64,621,408 </p><p>                  org.jboss.mx.server.registry.BasicMBeanRegistry Shallow Heap =>  48      Retained Heap => 64,621,680 </p><p>                      org.jboss.mx.server.MBeanServerImpl Shallow Heap => 24       Retained Heap => 65,055,032 </p><p>                          com.arjuna.ats.internal.jbossatx.agent.LocalJBossAgentImpl </p><p>                         java.lang.Thread @ 0x42135bb8 Signal Dispatcher Native Stack, Thread </p><p>                         org.jboss.invocation.pooled.server.PooledInvokerHA </p><p>                         org.jboss.invocation.pooled.server.PooledInvoker </p><p style="text-indent: 0.5in;">         org.jboss.remoting.transport.bisocket.BisocketServerInvoker </p><p>                       org.jboss.remoting.transport.socket.SocketServerInvoker </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  Any thoughts on this please?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks</p><p>Anil Mathew</p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/626575#626575">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Remoting at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2050">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>