Hi Peter, thanks for the response. I ran several samples using the method you outlined, summing the GC times from that one column. Typically the GC took about 2% of the total running time of the test. For example, my latest test ran for 75 seconds, and the garbage collector ran for ~1.5 seconds of that time. The memory settings I am using are: -Xms3072m -Xmx3072m -XX:NewSize=1024m -XX:MaxNewSize=1024m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 This seemed like fairly good results to me - what do you think? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4166515#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...