[jboss-user] [Performance Tuning] - Identifying the thread that is eating up my CPU

[mattlf]

Hi 

I need a little bit of help to get started

I use jboss4.2.2 with Jboss Messaging 1.4.0 SP3

My application is eating up 100% CPU and I am trying to find out which thread is responsible for it

When I run htop and I sort by CPU usage I see that my application created many threads and especially 2 of them eating up the CPU

PID User PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command

21997 root 16 0 2080M 1403M 129M S 100 18.3 5h35:28 /usr/lib/jvm/java-1.5.0-sun/bin/java -Dprogram.name=run.sh -server -Xms1024 -Xmx1024 -Dsun.rmi.dgc.client.gcInterval=3600000 ...........

21998 root 17 0 2080M 1403M 129M R 92.8 18.3 4h28:52 /usr/lib/jvm/java-1.5.0-sun/bin/java -Dprogram.name=run.sh -server -Xms1024 -Xmx1024 -Dsun.rmi.dgc.client.gcInterval=3600000 ...........

All other threads related to this application have CPU = 0%

When I run jps, I see

26596 Jps
21997 Main

When I run jstack 21997 > /tmp/jstack.21997 and view jstack.21997 then I don't see any information related to PID 21998

Why is that? I am trying to get an understanding of what the thread 21998 is doing but why can't I see anything about it in the jstack dump of the process 21997 ?

I would appreciate any help

Thank you

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