Hi! If you get OutOfMemory Errors and running java 1.6 (maybe later versions of java 1.5) you can make the vm to save a memory dump which you could load in ie. YourKit java profiler. And After a crach you could analyse the memroy in your applications.
I did that resently and it works like a charm. This is the parameters I used: -verbose:gc -XX:HeapDumpPath=C:\Java\heapdump -XX:+HeapDumpOnOutOfMemoryError -XX:+PrintGCDetails You could also look in the gc_log, sometimes you could see what's released and what needs correcting when jvm is doing a full gc. Hope it helps. (If you don't run java6 I can recommend it, faster and better :-) /Regards Per Jonsson -----Original Message----- From: Jerome Benezech [mailto:[EMAIL PROTECTED] Sent: den 14 maj 2007 11:21 To: users@tomcat.apache.org Subject: Tomcat Memory Usage Hi all, I run a cocoon webapp which is hosted on a shared Linux environnement and runs under tomcat 5.5.9. There are about 7 applications running under that tomcat instance (2 cocoon, at least 1 jsp, don't know for the others). My host provider complains that he tomcat uses a lot of memory and that he needs to restart it every 4 hours to release the memory. Tomcat runs as a daemon (started using jsvc) and with the following parameters: jsvc.exec -user tomcat -cp ./bootstrap.jar -Djava.endorsed.dirs=../common/endorsed -java.awt.headless=true -Xmx500000000 -XX:MaxPermSize=300m -debug -outfile ../logs/catalina.out -errfile ../logs/catalina.err -verbose org.apache.catalina.startup.Bootstrap -security I'm really not sure where to start looking: memory leak due to bad programming in the webapp or bad tomcat configuration leading to memory leaks. I also noticed there are quiet a few links in google pointing to problems with Tomcat not releasing memory (objets not getting garbage-collected), although they are mostly related to Tomcat 4.x. What is the situation on with Tomcat 5.5.9 ? I'm looking for help on what to look for, what configuration parameters should be used in production environnement, how can I pinpoint this memory problem ? Cheers, Jerome Jerome Benezech [EMAIL PROTECTED] --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] ******************************************************************************** This e-mail and the information it contains may be privileged and/or confidential. It is for the intended addressee(s) only. The unauthorised use, disclosure or copying of this e-mail, or any information it contains, is prohibited. If you are not an intended recipient, please contact the sender and delete the material from your computer. ******************************************************************************** --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
