Vítor Corrêa [http://community.jboss.org/people/vcorrea] created the discussion "Re: performance logging in tomcat or mod_jk" To view the discussion, visit: http://community.jboss.org/message/631006#631006 -------------------------------------------------------------- Hi Jimy, I would sugest that you analyse it with an jvm introspect tool. Im using byteman ( jboss.org/byteman ). You can write simple script to analyse when a class is istantiated. So if you have suspicious classes you can check its status on runtime. Hope that it can help -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/631006#631006] Start a new discussion in Performance Tuning at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Radoslav Husar [http://community.jboss.org/people/rhusar] created the discussion "Re: performance logging in tomcat or mod_jk" To view the discussion, visit: http://community.jboss.org/message/631131#631131 -------------------------------------------------------------- Jimy, you can configure your mod_jk to log more and you will see what was happening with the request (the logging will be however too verbose so not a good fit for production for sure). If there are chances you can reproduce than surely +1 for Byteman if you want to instrument a class/method to do additional logging. BTW "But there is no hs_error" - did the JVM user have permission to write it there? Make sure you are not calling System.exit() ;-) -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/631131#631131] Start a new discussion in Performance Tuning at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Jimy Liu [http://community.jboss.org/people/jimyliu] created the discussion "Re: performance logging in tomcat or mod_jk" To view the discussion, visit: http://community.jboss.org/message/631185#631185 -------------------------------------------------------------- Yes, configure the mod_jk in debug mode is too heavy and not possible for the live system.   We did try to examine our code to make sure there is no System.exit().   Since there is frequently GC activities before it crash and the heap size looked ok, we did not set this option XX:+HeapDumpOnOutOfMemoryError , either.  But I will set it to see if that helps. Thanks , Jimy -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/631185#631185] Start a new discussion in Performance Tuning at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Jimy Liu [http://community.jboss.org/people/jimyliu] created the discussion "Re: performance logging in tomcat or mod_jk" To view the discussion, visit: http://community.jboss.org/message/631195#631195 -------------------------------------------------------------- Sorry, I type incorrectly, there is NO frequently GC activities before it crash.  And yes, not reproducible either. :-( Will definitely try the byteman if I can get the breaking point. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/631195#631195] Start a new discussion in Performance Tuning at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]