Thanks, Peter. Definitely looks like we're leaking someplace. Just found out from admins that the startup params are: -Xms2048m -Xmx2048m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 There's 8GB on the box and two instances running with these settings. Not sure why the GCInterval was set this high and will look to tighten that up... could that cause the memory bloat over time? Your note did get us to look at the other usage on the box, as well, and so we may be able to find something there. (we were assuming that 8GB should be plenty to support 2 JBoss instances with Xmx2048m) Thanks! John View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4136864#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...