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From HLL <vicre...@gmail.com>
Subject RE: Optimal number of Tomcat instances versus Number of cores
Date Wed, 14 May 2008 12:03:39 GMT

Very well explained Peter. Thanks a lot. I take a note about the translation.
;)


Peter Crowther wrote:
> 
>> From: HLL [mailto:vicretru@gmail.com]
>> I have a doubt. How can I determine the optimal number of
>> Tomcat servers in
>> the same machine to achive the best throughput depending on
>> the number of
>> cores of the machine? That is, which is the optimal relation
>> between number of tomcats and number of cores.
> 
> Measure your application, under your expected load, on your hardware. 
> There is no other way.
> 
> If your application is well optimised and is not waiting on locks, the
> optimal number of Tomcats may be 1.  This optimises the cache behaviour of
> the cores, as you don't have multiple copies of the same code and data
> loaded at different locations and competing for cache lines.  Lock
> contention, garbage collector behaviour or many other variables could
> change that, and make it more optimal to segment your application.  If
> your machine is large enough to have a memory architecture where some
> processors have faster access to some memory, the optimal number of
> Tomcats may be one per memory segment - but this will need a *lot* of
> analysis and tuning.
> 
> [For future posts to forums: A better English translation may be
> "question" rather than "doubt"]
> 
>                 - Peter
> 
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> 
> 

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