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From Jesse Klaasse <>
Subject Re: Tomcat 100% CPU usage after moving from Java 5 to 6
Date Mon, 01 Feb 2010 10:22:29 GMT

In the meantime, the environment has been much more stable than it was before
the move to Java 6 and the new JVM options. However, a few minutes ago,
Tomcat became completely unresponsive, while the CPU usage was very low
(~3%). This was on our external server, with these options:

-Djavax.sql.DataSource.Factory=org.apache.commons.dbcp.BasicDataSourceFactory -XX:MaxPermSize=512m
-Xloggc:D:\logs\gc\tomcat-gc.log -XX:+PrintGCDetails -XX:+UseConcMarkSweepGC
-XX:+CMSClassUnloadingEnabled -XX:+DisableExplicitGC -XX:NewSize=3072m
-XX:+UseCompressedOops -Xms7168m -Xmx7168m

The gc log is showing a lot of activity during the unresponsiveness (the gc
log is attached to this message). Do you guys see any clues? Thanks in

The Tomcat GC log: tomcat-gc.log 
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