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Date: Tue, 03 May 2011 15:52:35 +0100
From: Mark Thomas <markt@apache.org>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: 100% CPU Usage when stopping Tomcat after OOM condition
References: <4DC00FA3.8010705@christopherschultz.net>
 <4DC01304.5020302@apache.org> <4DC0154F.7010908@ice-sa.com>
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On 03/05/2011 15:46, André Warnier wrote:
> Mark Thomas wrote:
>> On 03/05/2011 15:22, Christopher Schultz wrote:
>>> All,
>>>
>>> Moments ago in our development environment, our webapp suffered an OOME
>>> after many re-reployments (we know we have an undeploy-related leak).
>>> When attempting to bounce Tomcat, the shutdown failed and I took a
>>> thread dump which included the one non-trivial thread shown below.
>>>
>>> I haven't looked at the code yet to see if there is some kind of loop
>>> around this code, but top reported 100% CPU usage from this process so I
>>> suspect something like that was happening.
>>>
>>> We are using TC 6.0.32 on Debian Lenny and Sun/Oracle 32-bit
>>> 1.6.0_22-b04 Server VM.
>>>
>>> This is less of a "help" request as it is an observation of an
>>> unfortunate situation: the OOME is clearly the real problem and has
>>> nothing to do with Tomcat itself. Unfortunately, after the OOME, Tomcat
>>> was unable to shut down gracefully and that could be a problem in and of
>>> itself.
>>
>> After an OOME there are no guarantees as to the state of the JVM. That
>> Tomcat is unable to shut down cleanly in that case is not suprising.
>>
> Do I not remember seeing somewhere, at some point, a parameter named
> "OOMParachute" or similar ?

Yes, in the NIO connector. It may, or may not, provide the JVM with
enough memory to exit gracefully.

Mark


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