Hello and thanks for the help, The problem came back even after reducing the sleep time to 2 seconds. I could see that every 2 seconds the JVM cpu utilization jumps high and I get many warning messages. When the problem happens the JVM takes about 250M, mostly for JBoss cache. I will try to reduce the max nodes to 5000 and set the sleep time to 1 second. I still don't understand how JBoss should be configured. Should I change the queue size from 200,000 ? Does it have any implication on my situation ? Thanks again, Elad. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4171977#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...