Felix Schumacher wrote: > Am 23.02.2012 19:50, schrieb Ofer Israeli: >> Felix Schumacher wrote: >>> Am 23.02.2012 19:32, schrieb Ofer Israeli: >>>> Caldarale, Charles R wrote: >>>>>> From: Ofer Israeli [mailto:of...@checkpoint.com] >>>>>> Subject: RE: Tomcat with mod_jk becomes irresponsive after >>>>>> working for awhile >>>>> >>>>>> I am in the situation where the server is giving 503s for all >>>>>> incoming requests, so I did a capture now to see what the >>>>>> situation is and as mentioned above I see Tomcat FINing the >>>>>> connections right away before mod_jk sends any content >>>>> >>>>> You might want to take a thread dump of Tomcat and see just what >>>>> is going on. If all the threads are busy (or stuck), you may well >>>>> have an application problem causing the 503. >>>>> >>>>> - Chuck >>>>> >>>> Hi Chuck, >>>> >>>> I've taken a thread dump and haven't found anything that looks >>>> suspicious. What baffles me is that TaskManager shows that I have >>>> 580 threads in the Tomcat process (which makes sense since I use >>>> 500 worker threads for requests), but the thread dump only shows a >>>> small portion of these. Below is the dump, I'll be happy if you >>>> can give me some insight on this. >>>> >>>> 2012-02-23 20:08:16 >>>> Full thread dump Java HotSpot(TM) Client VM (19.1-b02 mixed mode): >>>> >>>> "Low Memory Detector" daemon prio=6 tid=0x16bc7400 nid=0x2b38 >>>> runnable [0x00000000] java.lang.Thread.State: RUNNABLE ... >>>> >>>> "main" prio=6 tid=0x002a7c00 nid=0x2ecc runnable [0x0093f000] >>>> java.lang.Thread.State: RUNNABLE >>>> at sun.tools.attach.WindowsVirtualMachine.connectPipe(Native >>>> Method) at >>>> >>>> >>>> sun.tools.attach.WindowsVirtualMachine.execute(WindowsVirtualMachine >>>> .java:82) at >>>> >>>> >>>> sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtual >>>> Machine.java:195) at >>>> >>>> >>>> sun.tools.attach.HotSpotVirtualMachine.remoteDataDump(HotSpotVirtualMachine.java:156) >>>> at sun.tools.jstack.JStack.runThreadDump(JStack.java:159) >>>> at sun.tools.jstack.JStack.main(JStack.java:94) >>> This is not a thread dump of tomcat, but rather jstack. Look at >>> >>> http://wiki.apache.org/tomcat/HowTo#How_do_I_obtain_a_thread_dump_of_ >>> my_running_webapp_.3F for more info, to get a thread dump of tomcat. >>> >>> Regards >>> Felix >> >> Hi Felix, >> >> I have seen that page but actually can't use the //MS// option as >> Tomcat is already running and in this bad state that I want to catch >> without restarting the service. Is there some way to gather this >> information without a restart? >> From what I understood jstack is supposed to give me all the JVM >> threads - am I missing something, can you elaborate on what it is I >> see there and why there are portions missing? Hi Ofer, > > I haven't used tomcat under windows, so I might be a bad adviser. > Maybe you could use a tool like visualvm or jconsole from the jdk to > attach to the running tomcat jvm and have a look at the threads. > > We will probably have to wait for windows users to help you. > > Regards > Felix
Hi all, So far I haven't found any way to get a thread dump of Tomcat running as a service on Windows 2003 Server without restarting the service. Does anyone know how this can be done? Thanks, Ofer --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
