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From evebill8 <evebi...@hotmail.com>
Subject Re: Heap size rule for Tomcat 5.5
Date Fri, 05 Feb 2010 18:05:40 GMT

Cool!  I just want to confirm if the rule is right.  My IT guy also does not
believe it.

Billy


Christopher Schultz-2 wrote:
> 
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> Evebill8,
> 
> On 2/5/2010 1:08 AM, evebill8 wrote:
>> I heard the rule to set the Tomcat's heap size is 2/3 of the memory.
> 
> I agree with Chuck: this sounds like malarkey. Whoever told you that
> doesn't know what they're talking about.
> 
> The rule for any Java program is: set the heap to whatever you need to
> properly run your program.
> 
> For instance, our production machine has a mere 2GiB of memory and our
> main JVM (we run 3 simultaneously) is configured to run with a 192MiB
> heap... much less than the "recommended" 1.3GiB heap you stated above.
> Our webapp runs very lean in memory and we don't have so many
> simultaneous users that we have tons and tons of sessions laying around.
> 
>> We are running Tomcat 5.5 on the 64-bit Linux.  The box has 16GB of
>> RAM, and we just allocate 8GB to heap.
> 
> Do you even need that much? We only recently raised the heap size from
> the default (in our environment) 64MiB heap, where it was running just
> fine until our user load increased.
> 
>> If the rule is true, this means I can allow at
>> least 10GB to Tomcat, and leave 6GB to the OS.
> 
> If there's nothing else running, the OS can certainly run comfortably in
> 6GiB of memory. Your OS ought to fit comfortable in a few /MiB/, let
> alone a few GiB.
> 
> - -chris
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