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From Donald Armstrong <donaldjarmstr...@gmail.com>
Subject JreMemoryLeakPreventionListener and hourly Full GC
Date Wed, 11 Aug 2010 16:15:20 GMT
Hello,

We have recently deployed tomcat-6.0.28 in our organization and are
noticing every hour, a Full GC is occurring.  The same application,
same JVM, same JVM args, just a new tomcat release.

I have addressed the issue by adjusting the server.xml and disabling
gcDaemonProtection.

<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"
gcDaemonProtection="false"/>

Ideas on what is causing the Full GC and why every hour?

our environment:
tomcat-6.0.28

java.vm.specification.vendor:Sun Microsystems Inc.
java.runtime.version:1.6.0_18-b07
sun.arch.data.model:64
os.version:5.10
os.arch:sparcv9

GC.log
212621.426: [Full GC (System) 212621.427:
[CMS:81164K->68018K(8005248K), 4.0688219 secs]
240526K->68018K(8350272K),[CMS Perm : 91877K->91830K(131072K)],
4.0694842 secs] [Times:user=4.08 sys=0.01, real=4.07 secs]
216225.566: [Full GC (System) 216225.567:
[CMS:82629K->64655K(8005248K), 3.9778052 secs]
210097K->64655K(8350272K),[CMS Perm : 91874K->91837K(131072K)],
3.9784728 secs] [Times:
user=3.98 sys=0.00, real=3.98 secs]
219829.596: [Full GC (System) 219829.597:
[CMS:87605K->73336K(8005248K), 4.2279768 secs]
313716K->73336K(8350272K),[CMS Perm : 91930K->91841K(131072K)],
4.2286745 secs] [Times:
user=4.23 sys=0.00, real=4.23 secs]

Thanks,
Donnie

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