On Wed, Aug 1, 2012 at 10:36 AM, Vojtech Juranek <vjura...@redhat.com> wrote: > On Wednesday 01 August 2012 10:07:15 Andrew Melo wrote: >> On Wed, Aug 1, 2012 at 9:48 AM, Vojtech Juranek <vjura...@redhat.com> wrote: >> > quick way how to look what the thread consuming CPU is doing is to do >> > thread dump (e.g. using jstack $PID) and use top with threads on (H >> > option) and then look up, see e.g. >> > http://code.nomad-labs.com/2010/11/18/identifying-which-java-thread-is- >> > consuming-most-cpu/ >> >> I see. I apparently don't have jstack on this machine :/. Does it only >> come with the JDK, or can I find it somewhere on the JRE? Once I find >> the offending thread, should it be pretty obvious what it does? > > jstack is part of JDK > > you can see the stack trace via Jenkins UI navigating to > $JENKINS_URL/threadDump but not sure if your (or any) Jenkins version provides > thread IDs. > > > Once you identify the offending thread, it should be obvious what it does (but > it may not be obvious why it does what it does:-)
Okay, I installed the jdk, and I looked some more. Using top, I see one jenkins thread taking the lionsshare of the time: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 24580 jenkins 25 0 3246m 743m 18m R 88.6 24.7 790:53.39 java 24591 jenkins 15 0 3246m 743m 18m S 0.0 24.7 40:14.51 java 25163 jenkins 15 0 3246m 743m 18m S 0.0 24.7 28:21.42 java 24601 jenkins 15 0 3246m 743m 18m S 0.0 24.7 27:24.95 java 24581 jenkins 15 0 3246m 743m 18m S 0.0 24.7 26:39.58 java 24589 jenkins 18 0 3246m 743m 18m S 0.2 24.7 24:41.60 java 24604 jenkins 15 0 3246m 743m 18m S 0.0 24.7 23:47.46 java 24603 jenkins 15 0 3246m 743m 18m S 0.6 24.7 17:05.23 java 24484 jenkins 15 0 3246m 743m 18m S 0.4 24.7 14:45.39 java 24612 jenkins 18 0 3246m 743m 18m S 0.0 24.7 11:50.45 java 24610 jenkins 15 0 3246m 743m 18m S 0.0 24.7 10:34.41 java 24564 jenkins 15 0 3246m 743m 18m S 0.0 24.7 8:56.60 java 24602 jenkins 15 0 3246m 743m 18m S 0.0 24.7 8:30.98 java 24565 jenkins 16 0 3246m 743m 18m S 11.5 24.7 8:22.85 java 24609 jenkins 15 0 3246m 743m 18m S 0.0 24.7 8:12.30 java 24582 jenkins 15 0 3246m 743m 18m S 0.6 24.7 3:48.67 java 24590 jenkins 15 0 3246m 743m 18m S 0.0 24.7 3:24.27 java 24579 jenkins 15 0 3246m 743m 18m S 0.0 24.7 3:22.16 java 24486 jenkins 15 0 3246m 743m 18m S 0.0 24.7 2:33.77 java 24973 jenkins 15 0 3246m 743m 18m S 0.0 24.7 2:18.32 java 24983 jenkins 15 0 3246m 743m 18m S 0.0 24.7 2:07.91 java 24838 jenkins 15 0 3246m 743m 18m S 0.0 24.7 1:38.35 java 24845 jenkins 15 0 3246m 743m 18m S 0.0 24.7 1:32.56 java 25037 jenkins 15 0 3246m 743m 18m S 0.0 24.7 1:16.63 java 25038 jenkins 15 0 3246m 743m 18m S 0.0 24.7 1:07.00 java 24491 jenkins 15 0 3246m 743m 18m S 0.0 24.7 1:05.38 java 24611 jenkins 15 0 3246m 743m 18m S 0.0 24.7 1:02.82 java 24488 jenkins 15 0 3246m 743m 18m S 0.0 24.7 1:00.30 java Then if I run jstack, I get the following backtrace: https://gist.github.com/3228105 Does that look useful at all? Thanks, Andrew -- -- Andrew Melo
