The best way to see what the GC is doing is to set one of the GC logging options: -verbose:gc, -XX:+PrintGCDetails or -XX:+PrintHeapAtGC. Plotting the data returned by those options should give you a better idea of that is really happening. I often speak on this topic, and actually found one of my presentations online at http://www.cecmg.de/doc/tagung_2007/agenda07/fileadmin/trilog/download/ce.... Hope it helps. I have other resources available, but they all cost money. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4101890#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...