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From Arjen van der Meijden <acmmail...@tweakers.net>
Subject Re: Memory leaks in AMQ 5.0?
Date Fri, 08 Feb 2008 10:47:30 GMT
Is there noone with an idea?

I've made a new graph with a longer timeperiod:
http://achelois.tweakers.net/~acm/tnet/long-activemq-gc.png

For now we can only fix this by periodically restart ActiveMQ, but 
that's not a very nice aproach.

Best regards,

Arjen

Arjen van der Meijden wrote:
> Hi list,
> 
> Currently we're seeing some strange behaviour from ActiveMQ 5.0 (release 
> version).
> 
> In our set-up we have one ActiveMQ instance with four queues on it and 
> all communication with AMQ is via the Stomp-interface. Although we 
> cleaned the activemq.xml a bit, we basically left all settings to their 
> respective defaults. We did change the Xmx-parameter in the bin-file to 
> 2048M though since the below described problems are much worse with only 
> the default 512M.
> 
> We have five apache/php-webservers that connect to AMQ and produce one 
> or two message on every page request. They use the php-implementation of 
> Stomp and about 70% of those messages are persistent.
> In peak moments, we do about 70-100 pageviews/second (and thus as many 
> connections to AMQ), which boils down to per-queue peaks of somewhere in 
> the 50 messages/second area.
> 
> Each queue has only one consumer. Those consumers throttle their 
> consumptionspeed based on the systemload, but normally they consume each 
> message as it enters a queue.
> The connection/subscription from the consumers to ActiveMQ is opened at 
> start and then kept open for the duration of the program.
> 
> Under normal conditions there is at most one message in a queue waiting 
> to be consumed, but we've also seen it handle a (growing) queue of 100k 
> messages with ease.
> 
> We're noticing decreasing performance and increasing memory usage over 
> time. So two days ago I started logging the CC:PrintGCDetails and made a 
> graph of the free new/total heap before and after each young-gc (which 
> also shows the full gc's):
> http://achelois.tweakers.net/~acm/tnet/activemq-gc.png
> 
> As you can see the new-part of the heap (green lines) isn't really 
> moving much, but the total heap (orange/red lines) keeps growing during 
> the day. What you also can see in the graph is the two nights AMQ was 
> running, and where no increase happened (from 20k to 40k seconds and 
> 100k to 120k). Our nights are, obviously, much quieter than our days.
> 
> I've tried the Concurrent GC, but reverted to the Parallel GC since the 
> first one couldn't keep up when the heap grew over 700MB. AMQ is running 
> on a dual processor opteron with 8GB of memory and several 15k-rpm scsi 
> disks in a raid 5 for its storage.
> 
> I'm clueless as to what this increase in memory consumption may cause 
> and/or how to prevent it.
> 
> Any ideas?
> 
> 
> Best regards,
> 
> Arjen van der Meijden
> Tweakers.net
> 

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