I have now fixed the infinite loop, and again did the update from Java 5 to Java 6. This time all seems to be working like a charm!
Along with fixing the infinite loop, I have dug a little deeper into the JVM arguments. I found the following article particularly useful: http://confluence.atlassian.com/display/DOC/Garbage+Collector+Performance+Issues Using that article plus common sense, my arguments are now: -Djavax.sql.DataSource.Factory=org.apache.commons.dbcp.BasicDataSourceFactory -Dcom.sun.management.jmxremote -XX:MaxPermSize=512m -Xloggc:D:\logs\gc\tomcat-gc.log -X:+PrintGCDetails -XX:+UseConcMarkSweepGC -XX:+UseTLAB -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled -XX:+DisableExplicitGC -XX:NewSize=4096m -Xms10240m -Xmx10240m The NewSize parameter was new to me, and it's explanation on the aforementioned link made much sense. A few things I'm still not completely sure about: - I don't want any serial garbage collection to occur. I'm not sure whether my arguments take care of this now.. - Do I still need the -XX:+UseTLAB argument? - Do I still need the -XX:+CMSClassUnloadingEnabled flag? - Do I still need the -XX:+CMSPermGenSweepingEnabled flag? So, still some research to be done. In the meantime I am very pleased with the results. Tomcat's CPU usage seems significantly lower than before (it's average seems about 10% now - which was 30-40% before) - scary! -- View this message in context: http://old.nabble.com/Tomcat-100--CPU-usage-after-moving-from-Java-5-to-6-tp27305110p27319482.html Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
