Again, I would configure jconsole for remote viewing. I'd keep an eye on a specific server, and watch his activity. My guess is you're going to see a condition graphically which will clearly point out to you what is going on, but you won't know until jconsole is configured and running.
--JMS -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vikram Godse Sent: Tuesday, March 07, 2006 1:03 PM To: Tomcat Users List Subject: Re: Tomcat Crashes after 1000 sessions. Hi, My CATALINA_OPTS parameter has the following values i have 4gb ram on my server >CATALINA_OPTS="-server -XX:MaxPermSize=512m -Xms1024m -Xmx1024m" This is what i see in the tomcat manager server info. >Max threads: 200 Min spare threads: 4 Max spare threads: 50 Current thread count: 20 >Current thread busy: 17 >Max processing time: 560464 ms Processing time: 2668.859 s Request count: 2800 Error >count: 46 Bytes received: 0.00 MB Bytes sent: 27.28 MB My Max threads are 200 of which current thread count is 20 and current busy are 17 with 128 active sessions. and my JVM shows the following >Free memory: 976.13 MB Total memory: 1003.93 MB Max memory: 1003.93 MB What i am worried about is the number of sessions keep on increasing my session timeout value is 30minutes.If i keep it less then the user session times out and the user is logged out of the system.If i run it in a test environment with about 5-10 people connecting then the number of sessions never go beyond 10. Is it so that tomcat is getting less resources due to which it is crashing or is it a configuration problem? Thanks & Regards, VIkram On 3/7/06, Sheets, Jerald <[EMAIL PROTECTED]> wrote: > 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] > > -- 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]
