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Subject: [jboss-user] [Performance Tuning] - jboss cpu spike - GC?
From: jboden <do-not-reply () jboss ! com>
Date: 2012-09-28 17:19:40
Message-ID: 2-762252-3-12872-1348852772237.jivesbs.jivemailuser () https://community ! jboss ! org
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jboden [https://community.jboss.org/people/jboden] created the discussion
"jboss cpu spike - GC?"
To view the discussion, visit: https://community.jboss.org/message/762252#762252
--------------------------------------------------------------
Hi,
I have a jboss 5.1 app with sun jdk 1.7.something. At night, it runs a large job and \
gobbles memory. The process gets to 2.5GB and never goes down, but I hear that's \
normal with heap space? But after a few days of this, I begin to see the cpu spike to \
100% of one cpu for a few seconds, then go down. This happens every 5 seconds or so, \
probably GC?
Using mostly a default run.bat, I have the jvm args set to:
-Xrs -Xms256M -Xmx2048M -XX:MaxPermSize=256m -XX:+CMSClassUnloadingEnabled \
-XX:+UseConcMarkSweepGC
-Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000
-Dorg.jboss.resolver.warning=true
Should we be doing something more specific? And if the GC keeps running that often \
even after the thread to do the nightly job has ended, do I have a memory leak \
somewhere? We do sometimes run out of memory, but maybe it needs Xmx of 4gb just to \
finish the job.
I'm going to up the memory anyway, but what clues do we look for to determine if \
there is a leak and/or better GC settings?
Thank you very much!
Jim
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created by <a href="https://community.jboss.org/people/jboden">jboden</a> in \
<i>Performance Tuning</i> - <a \
href="https://community.jboss.org/message/762252#762252">View the full discussion</a> \
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1px;">
<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; \
padding: 0px;"> </p><p>I have a jboss 5.1 app with sun jdk 1.7.something. At \
night, it runs a large job and gobbles memory. The process gets to 2.5GB and never \
goes down, but I hear that's normal with heap space? But after a few days of this, I \
begin to see the cpu spike to 100% of one cpu for a few seconds, then go down. This \
happens every 5 seconds or so, probably GC?</p><p style="min-height: 8pt; height: \
8pt; padding: 0px;"> </p><p>Using mostly a default run.bat, I have the jvm args \
set to:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>-Xrs \
-Xms256M -Xmx2048M -XX:MaxPermSize=256m -XX:+CMSClassUnloadingEnabled \
-XX:+UseConcMarkSweepGC </p><p> -Dsun.rmi.dgc.client.gcInterval=3600000 \
-Dsun.rmi.dgc.server.gcInterval=3600000</p><p> \
-Dorg.jboss.resolver.warning=true</p><p style="min-height: 8pt; height: 8pt; padding: \
0px;"> </p><p>Should we be doing something more specific? And if the GC keeps \
running that often even after the thread to do the nightly job has ended, do I have a \
memory leak somewhere? We do sometimes run out of memory, but maybe it needs Xmx of \
4gb just to finish the job. </p><p style="min-height: 8pt; height: 8pt; padding: \
0px;"> </p><p>I'm going to up the memory anyway, but what clues do we look for \
to determine if there is a leak and/or better GC settings?</p><p style="min-height: \
8pt; height: 8pt; padding: 0px;"> </p><p>Thank you very \
much!</p><p>Jim</p></div>
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<p style="margin: 0;">Reply to this message by <a \
href="https://community.jboss.org/message/762252#762252">going to Community</a></p> \
<p style="margin: 0;">Start a new discussion in Performance Tuning at <a \
href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2078">Community</a></p>
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