On Wed, Jan 30, 2013 at 12:27 PM, Dima Iva <ots...@live.com> wrote: > > We have a Windows 2008 R2 virtual machine on an ESXi server. It only runs > one application that requires Apache, Tomcat, Java and PostgreSQL. We have > the latest versions of these programs. The machine has 1TB of disk space > and 8GB of RAM. When I start the Tomcat 7 service, it starts using around > 95% of CPU in a span of a minute, after which the total utilization of CPU > by the machine is 100%. Process Explorer shows that the number of threads > for this process goes up to 91 and one of them shows over 15,000,000 Cycles > Delta and uses all the CPU. While the machine is stalled by Tomcat, the > commit charge for the machine is at 12% and physical memory usage at 25%, > only the CPU is maxed out. > > I added CATALINA_OPTS=-Xms4096m -Xmx512m to the Environment Variables, but > it doesn't seem to help. I believe there is a memory leak here, but not > sure how to pinpoint it using free tools and patch this leak. > > I am not one of the expert Tomcat users or committers, but I am using TomEE via Tomcat 7.0.35 Windows service (tomcat7w.exe) on Windows Server 2008 R2 with 32GB RAM and 1TB hard drive too (after migrating from Windows Server 2003 4GB RAM). Maybe I have not monitored it closely, but i have not seen the 100% CPU spike that you have experienced and I have found tomee/tomcat to be stable on Windows Server 2008 R2.
Instead of using CATALINA_OPTS=..., I specify the following java commandline options in the tomcat7 service dialog window (tomcat7/bin/tomcat7w.exe): -Xmx4096m -XX:MaxPermSize=512m -XX:+UseTLAB -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled
