Hi, Once you get the thread dump, post it, and we can try to help you figure out what's wrong. The Tomcat thread pools should automatically recover unused threads, subject to your configuration (see the maxSpareThreads and releated Connector configuration attributes).
Yoav Shapira http://www.yoavshapira.com >-----Original Message----- >From: Arnab Chakravarty [mailto:[EMAIL PROTECTED] >Sent: Tuesday, December 07, 2004 10:50 PM >To: Tomcat Users List >Subject: RE: Threads issues in Tomcat 5.0.28 > >Hey, > >I see your problem similar to mine some time in the past. What you need >to is the following: > >- Lower the number of threads and keep it close to 120-150 threads. >- Are you using a database, if yes, check if the DB connection pool is >the bottleneck >- Yes, you can find what the 200 threads are doing by taking a >threaddump. The way to do this is to use the command - kill -QUIT ><tomcat pid>. > >Hope this helps. > >Arnab > >-----Original Message----- >From: Matt Robinson [mailto:[EMAIL PROTECTED] >Sent: Wednesday, December 08, 2004 8:02 AM >To: [EMAIL PROTECTED] >Subject: Threads issues in Tomcat 5.0.28 > >Hi, > >We have 5 instances of Tomcat 5.0.28 running on their >own high performance servers (dual XEON / 2GB RAM, >etc) receiving AJP13 connector requests via our main >web server which has IIS 5, IIS redirector, and >Tomcat4. > >This works great even under high loads except for one >thing: after several hours of usage (could be 3 hours >or up 24 hours), the number of Tomcat threads on the >5.0.28 systems will suddenly increase at a rapid rate >until Tomcat no longer responds to requests. It will >hit the max # threads (which defaults to 200) and >essentially freeze until it is restarted. > >This is strange because this behavior does not seem to >correspond to increased usage of the particular server >it occurs on. We are not sure what is triggering this >and what those Tomcat threads are waiting on [they >remain busy, waiting and unable to be reused by >Tomcat]. > >My questions are: >1. Has anyone else experienced this kind of Thread >explosion problem? >2. Is there a way to find out exactly what each Tomcat >Thread is doing/waiting for? >3. Is there a way to periodically clear Tomcat's >threadpool -- i.e. get rid of waiting/busy/unusued >threads. > >We are working on ways to automatically restart Tomcat >once a certain # of threads is reached, but this is >not an acceptable solution, only a temporary >workaround of course. > >Many thanks in advance > > > > >__________________________________ >Do you Yahoo!? >Take Yahoo! Mail with you! Get it on your mobile phone. >http://mobile.yahoo.com/maildemo > >--------------------------------------------------------------------- >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]
