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From Ben Chobot <>
Subject Re: Thread pooling in ActiveMQ 5 cms
Date Tue, 19 Feb 2008 23:21:33 GMT
Thanks, that is a helpful link. FWIW, I've managed to sweep my issues 
under the carpet for the moment by reducing the stack size of a thread 
via ulimit... now my test program can have thousands of threads without 

Timothy Bish wrote:
> I think you may want to go read Sun's JMS tutorial 
> Every session as per the JMS spec has its own thread, but every session
> can have multiple consumers listening to different destinations.  So
> there should be no need to create 300 sessions.  Just create a consumer
> for each destination using a single session and only create a new
> session if you require that some be transactional or use client ack
> instead of auto ack etc.  
> Regards
> Tim.
> On Tue, 2008-02-19 at 12:25 -0800, Ben Chobot wrote:
>> Hey everybody. I'm playing around with the CMS client for ActiveMQ 5, 
>> and I'm having some threading issues. It seems that every time I start a 
>> session, I get a new thread to handle that session. Clearly, this won't 
>> scale to lots of sessions, and in fact my OS won't let me create more 
>> than 300 threads. I'm wondering if there's any way to get around this? 
>> Can a single session asynchronously listen to more than one destination? 
>> Even better, it looks like the CMS client has code for thread pools in 
>> it, but C++ isn't my strong suite and it's not clear to me how I would 
>> use it....
>> Any suggestions?
>> (As an aside, we're trying to figure out how reasonable it will be to 
>> have a single client listen to 10,000 mostly-inactive queues, probably 
>> mostly on separate brokers. Is that just flat-out not going to happen?)

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