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Struts & Hibernate
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| | | memory leak in tomcat 5.0.16 ? | memory leak in tomcat 5.0.16 ? 2004-01-22 - By Remy Maucherat
Back
Dale, Matt wrote:
> There is a known memory leak in 5.0.16, I'd upgrade to 5.0.18 and see
> if this fixes your problem.
You should read his report.
1) I don't see how he would be affected, since he seems to have a rather
small server; you need large variations in traffic to get the leak (and
the workaround is easy enough anyway)
2) He's using AJP, not HTTP ;)
> I am developing an intranet for a housing community using
> apache/tomcat and mysql. It was put in production to 200 users a few
> weeks ago and I noticed that the java-proces (tomcat) was "growing"
> from 8% memory usage when started to over 50% (seen with top / ps
> aux).
>
> When the mem-usage reach a certain level the java-proces uses most of
> the CPU- ressources as well - verbose:GC showed that this is the GC
> trying to keep up. This usually happens in a matter of 2-5 hours
> depending on the Xmx-settings - the number of active users / load
> seems to speed the process up (not confirmed). Restarting tomcat
> solves the problem for a while - but I would prefer a better
> permament solution.
>
> System settings: CPU: Pentium 1600 mhz RAM: 512 MB OS: Linux (Redhat)
> Java: j2re1.4.2_03 / jikes TOMCAT: 5.0.16 Connector:
> org.apache.coyote.tomcat5.CoyoteConnector (AJP/1.3) CATALINA_OPTS:
> -Xmx200m -Xms200m -Dbuild.compiler.emacs=true (have tried 117
> different settings)
>
> At first I used tomcat 4 and j2sdk1.4.1_03 and the "normal"
> javac-compiler. I changed to jakarta-tomcat-5 (See http://cat-5.ora-code.com).0.16 / j2re1.4.2_03 and
> jikes - this seems to have made the problem even worse. Before the
> update tomcat could go for more than 12 hours whitout restarting -
> now I have to restart every few hours.
>
> The application is quite DB-intensive: Every 30 secs. a java-thread
> queries a mysql-table with updated network-traffic data (used for
> traffic-shaping). In the same loop I SAX-parse a little XML-string
> using the JDOM-API (I have read about the StringBuffer-problem but
> this is not the cause since I'm now using j2re1.4.2_03 - right ?).
> I'm using mysql-connector-3 (See http://tor-3.ora-code.com).0.9 as JDBC-driver and protomatter-1 (See http://ter-1.ora-code.com).1.8
> to pool DB-connections. In the same loop I connect to a TCP- socket
> on the local server.
>
> I have done some profiling with HPJmeter and the -Xrunhprof argument
> with different settings. I'm a newbie in profiling but these
> observations might be useful: -Using HPJmeter' "guess memory leaks"
> the top-4 (See http://top-4.ora-code.com) suggested candidates are: java.util.vector,
> org.apache.commons.modeler.Registry  , org.apache.jk.core.MsgContext
> and org.apache.coyote.Request
>
> -"Residual objects" shows the following top-4 (See http://top-4.ora-code.com)-classes (bytes): int[]
> (10 MB) char[] (4 MB) java.lang.String (2 MB) byte[] (2 MB)
>
> Any help would be much appreciated...
>
> Regards Torstein Nilsen
--
xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
R�my Maucherat
Senior Developer & Consultant
JBoss Group (Europe) S�RL
xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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