I would look at a few things. First, you should read about and implement the JMX instrumentation (jconsle) to get a clear idea of your garbage collection profile. Second, your JVM server options (Xmx, Xms, etc.) need to be set high enough to handle that number of connections.
Make sure you have enough PermGen size (-XX:PermSize=128m, for instance) A lot of times people will throw so much ram at -Xms and -Xmx that they have depleted their PermGen space, and will get odd, nondescript errors that surround the all important "native memory" errors. Make sure you aren't garbage collecting to the tenured space quickly and efficiently, but keeping objeects there forever like luggage. In my experience (top 10 website with millions of views daily), we see that pushing the objects into tenured as quickly as possible is the best scenario, YMMV. Make sure you're garbage collecting effectively. -XX:+UseparNewGC, or maybe even an aggressive setting for GC. This will depend entirely on your own metrics you obtain through the jconsole. Each site is different, and just randomly throwing in numbers that some guy on the internet tells you is not the best idea, REGARDLESS of where he works, what his profile is, or how he does it. You have to tailor the container, you have to tailor the VM, and you have to start looking at the code once those are tuned properly. Jerald Sheets Systems Administrator The Weather Channel Interactive -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vikram Godse Sent: Tuesday, March 07, 2006 8:22 AM To: Tomcat Users List Subject: Tomcat Crashes after 1000 sessions. Hi, I am running Apache Tomcat/5.5.12 with JVM 1.5.0-b64.My O/S is RHEL4.0 ES.My hardware configuration is as follows Intel Xeon 3.0Ghz Dual CPU RAM 4gb I am running an JSP and Servlets based application with connectivity to MySQL 5 for database access. I am facing a problem, when my user sessions(in tomcat) go beyond 1000 the tomcat server stop serving requests and just displays a blank page.What i have observed that, though there are only 150 users actually accessing the website the number of sessions are atleast 800-900. Can anybody tell me where the problem lies? i have been trying a lot but no solution yet. Thanks & Regards, VIkram -- Try not do or do not, there is no try ! --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
