Hello, I wrote a post on this topic earlier this year:
http://www.javasystemsolutions.com/arslist/view/89025846 In a nutshell, start by setting the initial heap size to 90% of the maximum, so -Xms1400 -Xmx1536 in yuor case. Your current setup is encouraging the garbage collector to invoke a huge clean up of 1Gb, which will exhibit itself in the VM appearing to lock up. If you're using Apache and mod_jk, be sure to run mod_jk 1.2.31. There's a critical bug (https://issues.apache.org/bugzilla/show_bug.cgi?id=48169) in mod_jk which causes delays when dealing with AJP sockets that are not properly closed - we helped them resolve it so I can confirm it did exist. This may not be the problem, but it's worth considering. Finally, review your Midtier caching to see why it's consuming all this memory. I can't imagine ServletExec being much better than Tomcat - did you upgrade when you moved to Tomcat? John -- Single Sign On for AR System http://www.javasystemsolutions.com/jss/ssoplugin _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org attend wwrug11 www.wwrug.com ARSList: "Where the Answers Are"
