On Mar 4, 2014, at 1:55 PM, Isaac Gonzalez <igonza...@autoreturn.com> wrote:
> Dan, > > ________________________________________ > From: Daniel Mikusa [dmik...@gopivotal.com] > Sent: Tuesday, March 04, 2014 6:20 AM > To: Tomcat Users List > Subject: Re: tomcat 6 refuses mod_jk connections after server runs for a > couple of days > > On Mar 4, 2014, at 6:32 AM, Rainer Jung <rainer.j...@kippdata.de> wrote: > >> On 27.02.2014 23:06, Isaac Gonzalez wrote: >>> Hi Christopher(and Konstantin), attached is a couple of thread dumps of >>> when we experienced the issue again today. I also noticed we get this >>> message right before the problem occurs: >>> Feb 27, 2014 12:47:15 PM >>> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable run >>> SEVERE: Caught exception (java.lang.OutOfMemoryError: unable to create new >>> native thread) executing >>> org.apache.jk.common.ChannelSocket$SocketAcceptor@177ddea, terminating >>> thread >> >> Is it a 32Bit system? You have 2GB of heap plus Perm plus native memory >> needed by the process plus thread stacks. Not unlikely, that you ran out >> of memory address space for a 32 bit process. >> >> The only fixes would then be: >> >> - switch to a 64 bit system >> >> - reduce heap if the app can work with less >> >> - improve performance or eliminate bottlenecks so that the app works >> with less threads >> >> - limit you connector thread pool size. That will still mean that if >> requests begin to queue because of performance problems, the web server >> can't create additional connections, but you won't get in an irregular >> situation as you experience now. In that case you would need to >> configure a low idle timeout for the connections on the JK and TC side. > > It may also be possible to lower the thread stack size with the -Xss option. > > Ok so we are 64 bit Linux with 1024k in the 64-bit VM....would lowering it to > 64k be a bit too low? What sort of repercussions would we run into? > Very helpful information by the way. It depends on your apps, so you’ll need to test and see. If you go too low, you’ll get StackOverflow exceptions. If you see those, just gradually increase until they go away. Dan > > -Isaac > > http://www.oracle.com/technetwork/java/hotspotfaq-138619.html#threads_oom > > Might buy you some room for a few additional threads. > > Dan > >> >> Regards, >> >> Rainer >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
