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<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Re: JBoss 5.1 - CPU high, App stops responding
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created by <a href="http://community.jboss.org/people/wdfink">Wolf-Dieter Fink</a> in <i>Performance Tuning</i> - <a href="http://community.jboss.org/message/589648#589648">View the full discussion</a>
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<div class="jive-rendered-content"><p>It might be also possible that the GarbageCollector run into trouble (this happen to our app, also no gracefull JBoss shutdown possible).</p><p>Do you activate the GC logging for JBoss?</p><p>Add something like this to run.conf Java parameter:</p><p>'-verbose:gc -Xloggc:${LOGDIR}/gc_`date +%Y%m%d%H%M%S`.log -XX:+PrintGCDetails -XX:+PrintTenuringDistri</p><p>bution -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCTimeStamps'</p><p>here you will see that 'Application time' is only a few millis and 'Time where application stopped' are seconds .... <span> :( </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>for additional info look to <a class="jive-link-external-small" href="http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html">http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html</a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>if not active you might use 'jstat -gc PID 1000 1000' and check whether gc is called very often.</p><p>For infos about jstat lokk here <a class="jive-link-external-small" href="http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jstat.html">http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jstat.html</a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>hope it helps</p></div>
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