Thx Charles! We did take a thread dump and we found a lot of threads locked. Please see a short sample below:
"http-8014-9" daemon prio=10 tid=0x0000000060965c00 nid=0x6c83 in Object.wait() [0x000000004c688000..0x000000004c688c90] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:485) at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458) - locked <0x00002aaae10403b0> (a org.apache.tomcat.util.net.JIoEndpoint$Worker) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484) at java.lang.Thread.run(Thread.java:619) Sincerely, Talha. -----Original Message----- From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com] Sent: Friday, September 02, 2011 8:42 AM To: Tomcat Users List Subject: RE: Tomcat Performance Turning. > From: Talha Fazal [mailto:tfa...@credera.com] > Subject: Tomcat Performance Turning. > In our staging environment for load testing, when we run the load > test using 525 concurrent users, the app doesn't perform at all. > The CPU usage (on Apache and Tomcat Servers) hovers between 7% to > 8%. The database server CPU usage is also between 4 and 5%. Since your CPU usage is low, your threads must be waiting for something. Take several thread dumps and find out what. http://wiki.apache.org/tomcat/HowTo#How_do_I_obtain_a_thread_dump_of_my_running_webapp_.3F (I'll guess maxThreads and data base connections; a max of 30 seems a bit low for 525 concurrent requests.) > validationQuery="SELECT 1 FROM BB_DUAL" Most DBs provide a very simple ping-like request capability; that would be preferable to a select. > -Xms512m -Xmx2048m In a server environment, one normally sets Xms and Xmx to the same value to avoid heap thrashing. However, this is unrelated to your current problem. - 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 unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org