Thanks Chuck.. One question thou.. in the JAVA_OPTS do we have to specify -server cos it runs as client by default. Will it bring any change to performance ?
On Wed, Nov 19, 2008 at 12:27 PM, Caldarale, Charles R < [EMAIL PROTECTED]> wrote: > > From: Vasanth Kumar ravi [mailto:[EMAIL PROTECTED] > > Subject: Question on Performance Tuning > > > > We did take thread dumps while performing the test, and > > found nothing related to application bottlenecks. > > Thread dumps are appropriate for diagnosing hangs, but they're not terribly > useful for analyzing CPU usage. You'd be better off running a profiler to > see where time is being spent. Even the JVM's built-in hprof running in > sample mode should give you a pretty good idea of where the cycles are going > (or use JVisualVM). > > > Can I get some pointers on anything to be tuned in > > the tomcat to reduce the cpu utilization. > > First, find out what's really using the CPU before fiddling with anything. > Tweaking Tomcat is not likely to change much assuming the thread pool and > heap are adequate for your load. > > You've specified several GC options that may or may not be appropriate. > Unless you've proven that changing NewRatio, NewSize, MaxNewSize, and > SurvivorRatio actually helps your throughput, you're likely better off > leaving them alone. 128M MaxPermSize may be too small if you have a lot of > classes in your webapps. Enabling concurrent GC produces more regular > response times, but will actually *reduce* throughput in most cases. > > These might help slightly: > * Remove AspectJ. > * Turn off PrintGCDetails. > * Remove unused webapps. > * Precompile JSPs. > * Turn off auto-deployment. > * Turn off monitored resources. > * Set the parameters for the JSP servlet (in conf/web.xml) for production. > > - Chuck > > > THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY > MATERIAL and is thus for use only by the intended recipient. If you received > this in error, please contact the sender and delete the e-mail and its > attachments from all computers. > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- Regards&Thanks, Vasanth Kumar Ravi
