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From "Olivier Fourel" <olivier.fou...@gmail.com>
Subject Re: Tomcat 5.5 hanged . Thread Dump Analyze
Date Wed, 16 Jul 2008 07:16:45 GMT
I would like to give precision :

Only one connector is hanged when the problem occurs. the 8180.
The other connectors handle request properly.

Could it be that the connector is stuck in garbage tasks ?




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> On Wed, Jul 16, 2008 at 4:38 AM, Caldarale, Charles R <
> Chuck.Caldarale@unisys.com> wrote:
>
>> > From: Olivier Fourel [mailto:olivier.fourel@gmail.com]
>> > Subject: Tomcat 5.5 hanged . Thread Dump Analyze
>> >
>> > our Tomcat production server hanged again.
>> > We made 2 thread dumps with few minutes between them.
>>
>> The only thing I found suspicious is that PermGen is at 99% in both of
>> them.  (You also have a tonne of non-Tomcat threads running around, but none
>> appear hung; I presume your webapps created these and will dispose of them
>> properly at an appropriate time.)
>>
>> If you are filling up the PermGen, you should be getting log entries for
>> the OOMEs being thrown - unless something in your webapps is catching them
>> and throwing them away.  PermGen exhaustion is frequently caused by poor
>> application design, hanging on to references to classes that should be
>> discarded.  This link (from the Tomcat FAQ) contains some interesting
>> comments:
>>
>> http://opensource.atlassian.com/confluence/spring/pages/viewpage.action?pageId=2669
>>
>> You might try increasing the PermGen size, but that is likely only to
>> delay the inevitable until you fix the memory leak.  You can monitor the
>> PermGen growth with JConsole with little impact on performance.
>>
>>  - Chuck
>>
>>
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