Tomcat may be freezing when it's doing full GC. I've been watching this by turning on "-verbose:gc" option. Sometimes it was taking Tomcat 3 minutes to perform the full GC, during which period Tomcat will be freezing, all requests will be queued and not processed.
-----Original Message----- From: Chong Yu Meng [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 28, 2003 9:43 AM To: Tomcat Users List Subject: Re: Tomcat STILL freezing - time to look at another app server? I always tell the younger engineers that computers are sentient beings in so far as they can smell fear and inexperience. A newly hired engineer may run into trouble even if he followed the step by step instructions to the letter. And strange stuff can happen to him/her on shift. But on to your problem : I'm thinking maybe the system is doing garbage collection at the time it freezes ...? Do you hear the hard disk thrashing about for a long time during those freezes ? It's happened to me before. The trouble with garbage collection is that you never know when it will kick in. The only other time I encountered freezing was with my Abit motherboard (this is the dual-Celeron motherboard that had the design flaw of an under-powered capacitor). If you are using this motherboard, your best bet is to throw it away. I've never bought anything from Abit after that. Regards, pascal chong Hunter, Sandra wrote: >Well this issue continues. Code has been commented, logged, oracle >permissions all tickety boo, no locks. > >It really is intermittent, and in my opinion seems to be somewhat related to >network traffic. I talked to one of the tech guys and he seemed to think I >was nuts. > >It never happens at night or on the weekends when I am pretty much the only >one on the network. > >Does that sound possible to any one with more experience than I? > >Although we moved it to the live server we had some install problems there >and so I am still running off my dev machine. It is just a regular P4 with >about 1600mhz and 256 ram. Do you think the freezing will cease when running >off the server? > >And on the other subject: have any of you tried other app servers out there? >Do you have any opinions? Tomcat seems to be the industry standard but if I >can't resolve this freezing issue I might get some pressure to try some >different technology. > >-----Original Message----- >From: Hunter, Sandra [mailto:[EMAIL PROTECTED] >Sent: Friday, May 16, 2003 2:52 PM >To: 'Tomcat Users List' >Subject: RE: Tomcat Freezing? > >The lock may be an issue: I'll run that past our DBA but that's the only >thing I haven't looked at. >We have actually moved the app to another machine to see if that makes any >difference. >If anyone gets a bright idea I would love to hear it! >Puzzled Sandra > > > --------------------------------------------------------------------- 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]
