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From Timothy Bish <tabish...@gmail.com>
Subject Re: Testing Java vs. CMS/C++ consumer: CMS is much slower, any ideas please?
Date Mon, 26 Nov 2012 14:04:39 GMT
On Wed, 2012-11-21 at 13:22 -0800, sdonovan_uk wrote: 
> I’ve found a significant performance difference using Qs between Java and
> CMS/C++ consumers.
> 

What is the connection URI used between the Java client and broker vs
the C++ client and broker ?

> Environment:
> 	Windows 2008R2, Opteron @ 2.4GHz (lots of cores)
> 	Everything is 64-bit:  JDK 1.7.0_02 & C++ compiled with VS.NET 2010 (as
> Release/x64)
> 
> ActiveMQ V5.7.0:
> 	persistent=false, 
> 	queue: prioritizedMessages=false, producerFlowControl=false,
> optimizedDispatch=true
> 	        vmQueueCursor
> 
> Consumer:
> 	Java (from V5.7.0), CMS/C++ (v3.4.0, snapshot V3.5.0 and trunk **all**
> exhibit the problem)
> 	prefetch=1
> 	ack=client_acknowledge
> 
> I have dummy consumers in both cases.  Each introduces a sleep/wait.  I
> tested with 0ms and 3ms.
> 
> 	Test #1:  0ms wait, 1x consumer
> 		Java = ~15,256 messages/second
> 		C++ = ~4,173 messages/second
> 
> 	Test #2: 3ms wait, 1x consumer
> 		Java = ~328 messages/second  (this is good, almost the theoretical
> maximum)
> 		C++ = ~64 messages/second (this is awful)
> 
> Two problems:
> 
> 	Problem #1: with the 0ms case, C++ performance is significantly worse.
> 
> 	Problem #2: with the 3m case, C++ is **limited** to 64 messages a second.
> 		What’s interesting, is that you can increase the # of consumers (to 16,
> 32, etc) and **still** get ~64 messages/second
> 
> Any ideas why CMS is so much slower?
> 
> Many thanks!
> 
> Sean
> 		
> 
> 
> 
> --
> View this message in context: http://activemq.2283324.n4.nabble.com/Testing-Java-vs-CMS-C-consumer-CMS-is-much-slower-any-ideas-please-tp4659653.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.

-- 
Tim Bish
Sr Software Engineer | RedHat Inc.
tim.bish@redhat.com | www.fusesource.com | www.redhat.com 
skype: tabish121 | twitter: @tabish121
blog: http://timbish.blogspot.com/


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