Re: tomcat hangging problem
[EMAIL PROTECTED] wrote: My bet is that this is related with the VM/libraries. It can of course be a bug in tomcat, like a deadlock or something - but then it would fail on all SMP machines. I think like this. A strange thing I noticed yesterday: on hangging machines, running with -Xms100m -Xmx200m seems to hide problem (I guess hang would occur later, but a less-than-10-minutes process ran all night long (and was running till somebody (!$*รน#@) reboot)). Aha. I would bet something is wrong in the GC or memory allocator. Are you running the _latest_ version of the VM ? Can you file a bug on this ? I do think so (but if you tried someday to find something in IBM website, you know how it is hard to find something!): ./java -fullversion java full version J2RE 1.3.0 IBM build ca130-20010615 where do you expect me to file that bug? ibm? wow! I did open a call, but via our internal helpdesk, and then via somebody @ibm.com who does not know anything about java and aix :-( well, it seems problem has reached more concerned persons, but I really don't know who :} Does it happen with any servlet ( say HelloWorld ) or only with your application ? Can you create a simple servlet ( that eventually does some allocation - in case the bug is in the GC ), and see if it can reproduce the problem ? well, I did write a sample that shows problem (I can tell more or send code), but after a couple of hours running: I could make it alloc much more when looping... hope this could make it hang faster. -- Joseph This message and any attachments (the message) is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will) not therefore be liable for the message if modified. - Ce message et toutes les pieces jointes (ci-apres le message) sont etablis a l'intention exclusive de ses destinataires et sont confidentiels. Si vous recevez ce message par erreur, merci de le detruire et d'en avertir immediatement l'expediteur. Toute utilisation de ce message non conforme a sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'internet ne permettant pas d'assurer l'integrite de ce message, BNP PARIBAS (et ses filiales) decline(nt) toute responsabilite au titre de ce message, dans l'hypothese ou il aurait ete modifie.
tomcat hangging problem
Hello... Here is the description of current problem I try to solve... I have already mailed to tomcat-user, but since nobody has a beginning of an answer, and since we can't go on production launch anymore, I try here. environment: - AIX 4.3.3 SMP, - JRE 1.2.2 (several builds), then 1.3.0 - tomcat 3.2.1, 3.2.3 then 3.3.b2 (sorry, did not try 3.3.rc1 yet!) problem is: tomcat hangs after some time (may be 3 minutes or some hours). I mean tomcat is running (ps shows it), but no answer is received to requests when tomcat hangs (telnetting it with a http get request results in no response). Even a kill -3 does nothing. Strangely, problem occurs only on _some_ of AIX 4.3.3 machines where I run tomcat. Some machines, with same jre/tomcat/code, run with no problem (well, maybe problem would occur after a much longer time, I don't really know). And I did not met that on winNT4 (with a Sun jdk: I got to try with an ibm jvm). Note that I got a javacore twice, if somebody can interpret it... I wrote a simple servlet which shows tomcat hangging, if that can help: a singleton deals with doGet: first time it launches 'n' threads, each of them will http-request same singleton every 't' seconds and print result to stdout. other request to singleton only prints text/plain string to response's writer. Thanks -- Joseph Vallot This message and any attachments (the message) is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will) not therefore be liable for the message if modified. - Ce message et toutes les pieces jointes (ci-apres le message) sont etablis a l'intention exclusive de ses destinataires et sont confidentiels. Si vous recevez ce message par erreur, merci de le detruire et d'en avertir immediatement l'expediteur. Toute utilisation de ce message non conforme a sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'internet ne permettant pas d'assurer l'integrite de ce message, BNP PARIBAS (et ses filiales) decline(nt) toute responsabilite au titre de ce message, dans l'hypothese ou il aurait ete modifie.
