Re: Infinite loop?

[Dieter.Bender@xxxxxxxxxxx (Dieter Bender)]

Frances,

On Sunday 22 December 2002 15:29, you wrote:
> Ito might be that the garbage collector has kicked in for some reason (such
> as alot of stuff to collect) and is trying to cleanup. I have seen sone
> case where the job appeared like it would not end, but in actuality it took
> to 14 hours, because the collector was returning heap to the system (that
> is the simplified form of what was happening).
>
> A process dump of all the threads (or the single thread) when the job is
> consuming the CPU would show whether it was the garbage collector or not,
> and also would show the stack for the thread in question.  Have done a

the dump fails with timeout and it's impossible to show the thread
information with the same problem.

> WRKSYSSTS to see if storage is being returned (i.e. percent used is going
> down) or if there is an inordinate amount of paging etc. going on in the
> storage pool in which WAS runs?

no paging, no consumption of storage.

>
> What I would recommend ideally is that you talk to IBM Support about the
> problem and get things setup so that when the problem occurs (hopefully
> during normal working hours), IBM Support can get on the system and debug
> the problem.

And here starts my problem, we are in germany and ibm support tells that
there must be a problem with the application and WAS performs fine. And they
are telling we should write a little program wich makes the problem
reproducable.

Dieter

>
> Frances Stewart
> WebSphere Application Server for iSeries 400
> IBM Rochester
>
>
>
>
>                       Dieter.Bender@t-o
>                       nline.de (Dieter         To:
> java400-l@midrange.com Bender)                  cc:
>                       Sent by:                 Subject:  Infinite loop?
>                       java400-l-admin@m
>                       idrange.com
>
>
>                       12/22/2002 04:39
>                       AM
>                       Please respond to
>                       java400-l
>
>
>
>
>
> Hi,
>
> we use WebSphere 3.5.6 running on as400 V5R1;
> from time to time CPU usage reaches near 100% all used by one thread of the
> application server. Nobody is working with the application and only
> PWRDWNSYS
> *immed brings down WebSphere. It's impossible to end the server from the
> WepSphere console, or to stop it in another way. Neither endjob, normal or
> abnormal, nor endsbs kills WebsFear.
> It looks like an infinite loop, maybe in the JIT compile. CRTJVAPGM to
> clearify this is a little bit complicated, beacause we use JSPs and it is
> running hours to days.
> The problem doesn't occur running WebSphere on another box (NT).
>
> any ideas?

--
mfG

Dieter Bender


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