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<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Interesting JBoss 5 Memory Footprint/Leak
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created by <a href="https://community.jboss.org/people/hangsu">hangsu</a> in <i>Performance Tuning</i> - <a href="https://community.jboss.org/message/758389#758389">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi All,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am having a rather interesting memory leak problem with JBoss5 recently. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>So the heap size is 4G, and from profiling tool, JVM think it's managing 4G of memory.</p><p>I did couple memory dumps at different stage, it's also less than 4G.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Now the interesting thing is, if I check the memory in Linux, the JBoss JVM process is taking 97%+ RAM and increasing until OOM Killer jump in and kill the process. (We are on a VM with 8G RAM)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>What make it more interesting is, we have -XX:AggressiveHeap in JAVA_OPTS, once I took that out and restart JBoss, everything is back to normal.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This make me believe it's some glitch in Java GC, that the Linux OS is unable to free RAM JVM trying to release. But I can't find anything related to this on google.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I can provide more information if needed. Some basic environment are:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>OS: CentOS5 64bit</p><p>JAVA: Oracle JDK 1.6.0_31 64 bit</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>And just in case you wonder, why I post it here rather than JAVA forum, we have same product in JBoss4 and it was running fine, and I believe the migration code change is done correctly, and same product for another customer is running fine in JBoss5. I could compare the difference between the two versions, but as you can see from heap size, this is a monster product and code base are very different from release to release.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Has anyone see anything similar to this? any help or information would be appreciated.</p></div>
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