Howdy, GC behavior is not tomcat-specific. It's the JVM that's doing the GC, and if you have a stop-the-world full GC algorithm triggered, then everything in the JVM will stop. Again, not related to tomcat. Bad GC tuning will bite you on every server.
Yoav Shapira Millennium ChemInformatics >-----Original Message----- >From: Hua Hou [mailto:[EMAIL PROTECTED] >Sent: Wednesday, May 28, 2003 11:56 AM >To: 'Tomcat Users List' >Subject: RE: Tomcat STILL freezing - time to look at another app server? > >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] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
