It could be that you catch a "maximum open handles" error. If you are using the standard linux distribution it is set to 1200 connections. And if you have 500 users and every user opens an connection you are up to 1000 and the remaining 200 are very quickly used up. The result is that all java app's (tomcat, console, what ever) crashes instantly. But the other system tasks keep running. You should recompile the linux kernel with about 12,000 connection or more (max is 65000, we use this). You could also use the latest kernel which has no limit for connections.
mfg Michael Nitschke -----Original Message----- From: Filip Hanik (lists) [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 06, 2004 1:49 PM To: Tomcat Users List Subject: RE: Performance issue sounds like an App problem, cause your hardware is sure powerful, assuming you configured your connector threads to handle enough concurrency Filip -----Original Message----- From: Alex [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 06, 2004 6:20 AM To: Tomcat Users List Subject: Re: Performance issue How big is your average session? On Wed, 6 Oct 2004, Faisal Abdullah wrote: > Date: Wed, 6 Oct 2004 17:20:05 +0800 > From: Faisal Abdullah <[EMAIL PROTECTED]> > Reply-To: Tomcat Users List <[EMAIL PROTECTED]>, > Faisal Abdullah <[EMAIL PROTECTED]> > To: Tomcat Users List <[EMAIL PROTECTED]> > Subject: Performance issue > > Hi, > > I have 4 *really* sluggish Tomcats. All 4 are load balanced: > Tomcat Version:4.1.30 > Java: Sun 1.4.2_02 > SMP: 4 CPU Xeon 2GHz > Memory: 4GB > OS: Redhat AS 3.0 > > Users can reach 500 at peak time (about 150 per server). > It takes about 2-4 minutes to load. > And we're also having session time-outs. > Previously, JVM died quite often, so now we're using a wrapper to > restart it after it crashes. > > I have 128M initial memory, and 2GB max memory for JVM. > > Is this normal? Is this a Tomcat issue, a tuning issue, or a very > badly written app? > Appreciate the help. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.768 / Virus Database: 515 - Release Date: 9/22/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.768 / Virus Database: 515 - Release Date: 9/22/2004 --------------------------------------------------------------------- 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]
