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From Jonathan Mast <>
Subject Re: Tomcat dies suddenly
Date Sat, 06 Feb 2010 00:11:47 GMT
Hi Carl, I've skimmed thru all your posts, please excuse me if these
questions are redundant.

You've mentioned VisualJVM, JMeter, and Slackware monitoring tools, it seems
to me that you are using these to occasionally to monitor you Tomcat
instance, when things seem to be going badly (thats my perception from
reading your posts)

Have you done any long term sampling (Tomcat threads, memory, etc) of your

I use Slackware 12.2 (32-bit), Httpd 2.2, Java 1.6, Tomcat 6.0.18 and had
Tomcat die in a manner similiar to yours:  First it died silently (nothing
in the catalina.out), the next time (about a week later) it became
non-responsive complaining about PermGen, OOMException and so on.  I haven't
determined the cause yet, I rolled over to another server (exact same
hardware/software btw).

I ran Memtest on the problematic server, no problems detected.

Anyways, I've been sampling the httpd process count, tomcat thread count,
and free memory (sans cache and buffers) every minute via a cron job and
writing the results to a file on both machines since this issue arose about
2 weeks ago.  My hope is that the next time it bugs out, i'll be able to say
"oh the thread count exploded, but the memory use only increased
incrementally" or whatever the cause actually is.

Have you done any monitoring at that fine grained a level on your systems?

It would be especially interesting to see how your old HW setup compares to
the new ones.

Hope I've helped a little bit :)

On Fri, Feb 5, 2010 at 11:26 AM, Carl <> wrote:

> Chris,
> I agree but this seemed like a low risk change.  I also understand that
> changing too many things at once sometimes confuses the issue.
> Thanks,
> Carl
> ----- Original Message ----- From: "Christopher Schultz" <
> To: "Tomcat Users List" <>
> Sent: Friday, February 05, 2010 10:48 AM
> Subject: Re: Tomcat dies suddenly
>> Hash: SHA1
>> Carl,
>> On 2/5/2010 10:16 AM, Carl wrote:
>>> Do you see any harm in just doubling the number (to 2048) just to see if
>>> it has an impact?
>> We would expect to see an OOME (strange, I know) if you were running out
>> of file descriptors.
>> - -chris
>> Version: GnuPG v1.4.10 (MingW32)
>> Comment: Using GnuPG with Mozilla -
>> AMkAn1H2romyi8eFunc3lF+eDiQa0Hlq
>> =muVu
>> -----END PGP SIGNATURE-----
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