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From "Dave Stubbs" <d...@stubbs.uk.com>
Subject RE: Tomcat 5.5.27 - Solaris 10 - Tomcat process starts additional copies of itself with only 1 thread and no CPU
Date Fri, 09 Sep 2011 11:49:25 GMT
I'll get that checked when it next happens (it's doing it daily at the
moment sometime several times).

We've already tried to match the events with the activity on the parent JVM,
haven't found anything yet though (haven't given up on this).

One thing we did notice is higher CPU usage on the main JVM. We're not sure
yet if this happens before or after is creates the additional JVMs, or if
that's just due to high load on the application. We're monitoring that as
well.

-----Original Message-----
From: Tobias Crefeld [mailto:tc@cataneo.eu] 
Sent: 09 September 2011 11:11
To: users@tomcat.apache.org
Subject: Re: Tomcat 5.5.27 - Solaris 10 - Tomcat process starts additional
copies of itself with only 1 thread and no CPU

Am Fri, 9 Sep 2011 09:54:36 +0100
schrieb "Dave Stubbs" <dave@stubbs.uk.com>:

> When we list the system tasks we see that the ghost process PPID is 
> the same as the PID of the still running main tomcat instance. Here is 
> list of what happened when it wasn't picked up for a while.

Obviously the "parent"-JVM itself starts the other JVMs, so it must be an
application issue.
Do the "child-JVMs" stop when 21115 shuts down?
Do the child-JVMs terminate on "normal" signals like -SIGTERM?

I would try to log the exact time, when these additional JVM are being
started and compare these with things that were happening on the
"parent"-Tomcat - maybe you find a application dependency that way.

Just an idea: Maybe the parent-JVM gets a signal to restart itself that
isn't handled correct?
(
http://publib.boulder.ibm.com/infocenter/realtime/v1r0/topic/com.ibm.rt.doc.
10/user/signals.html
- sorry, but haven't found a source for Sun-JDK instantly)

Regards,
 Tobias.

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