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From "Robinson, Eric" <>
Subject RE: Setting the Right Amount of Memory
Date Sat, 19 Jun 2010 23:03:48 GMT
On 17/06/2010 08:59, Robinson, Eric wrote:
>> If your heap size is right on the edge of your minimum for a Tomcat 
>> instance, you may be doing more GC work than is really needed.
>> However, if you're satisfied with the response time and CPU 
>> utilization, you should be ok.

> Time to hit the vendor around the head with the cluebat. If 
> the app is happy with less heap space then increasing it 
> is only going to cause problems - mainly that GC when it 
> happens will take longer and trigger longer pauses. You 
> can mitigate this with GC config (later VMs may make the 
> right choices for you anyway) but all this is just adding 
> unecessary complexity.

> Mark

With 160 instances of tomcat on the server, and most of them happy with
64-96MB of RAM, could you take an educated guess at the negative impact
on the server of raising the RAM to 512MB for each instance? How much
extra CPU utilization do you think I could possibly see from all the
extra GC?


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