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From Stella Lok <>
Subject Re: Web server stopped responding to requests until restart
Date Thu, 26 Feb 2009 16:42:31 GMT
Hi Kevan,

The machine has one Xeon processor which is a dual core. I am running

I do have the thread dump showing the blocked MQ threads, which I have
just forwarded to you, if you would like to take a look (if anyone
else is interested in taking a look, please let me know)

Btw, the activemq used is not the one embedded in WASCE, but an external one.

Thank you very much

On Thu, Feb 26, 2009 at 11:13 PM, Kevan Miller <> wrote:
> On Feb 26, 2009, at 5:58 AM, Stella Lok wrote:
>> Hi,
>> I am using WAS CE with ActiveMQ 5.2.0. While doing load
>> testing, I encountered situations when the web server (which is the
>> Tomcat embedded in WAS CE) permanently (until restart) stopped
>> responding to any HTTP requests (the catalina log stops logging new
>> requests), and none of the apps nor the admin console can be accessed
>> anymore. When that happens, the WAS CE java process' CPU utilization
>> would invariably be permanently stuck at around the 50% level, even if
>> I completely stop accessing the server.
>> I did a thread dump whenever this occurred, and most of the time I do
>> not see any blocked threads, only runnable, parked and
>> waiting-on-condition threads. Once, I was able to see that there were
>> 4 blocked ActiveMQ threads, though I'm not sure if this is related.
>> I would be most grateful if someone could help guide me to possible
>> causes of the problem.
> Hmm. Do you still have the thread dumps? Esp. the one showing the blocked
> AMQ threads? Is this a 2 CPU machine (e.g. a single dual core processor?)
> Sounds like you have a single thread spinning. A thread dump should help
> identify the culprit... Are you running on Sun or IBM JSE?
> --kevan

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