There is a known memory leak in 5.0.16, I'd upgrade to 5.0.18 and see if this fixes your problem.
Ta Matt -----Original Message----- From: Torstein Nilsen [mailto:[EMAIL PROTECTED] Sent: 22 January 2004 10:01 To: [EMAIL PROTECTED] Subject: memory leak in tomcat 5.0.16 ? 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-5.0.16 / 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-3.0.9 as JDBC-driver and protomatter-1.1.8 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 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-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 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
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