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Date: Wed, 25 Jan 2012 12:53:03 +0000
From: Mark Thomas <markt@apache.org>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: Tomcat memory requirements
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On 25/01/2012 11:45, Celso Magalh�es Dantas Neto wrote:
> Hey everyone!
> 
> Does anyone knows where I can find any information about Tomcat memory
> requirements?

Tomcat needs less than 20MB to start up. Everything after that depends
on the application and the load level.

> Here's the problem: I got a client who's running a Tomcat process in his
> machine and it is taking around 150MB of RAM and he is complaining about
> it. It's a webapp and for me it's normal to a webapp to take that amount of
> memory, but I want to argue with him with some data.

I have seen Tomcat running on JVMs with memory settings ranging from
32MB to 8GB. 150MB isn't unreasonable at first glance but it all depends
on the app.

> So I'm looking for some Tomcat memory requirements info, even if it's a
> memory requirements to run Tomcat only, with no deployed webapp. It will
> help me to argue with him.

See above. The Tomcat only figure is less than 20MB.

You'll need to use a profiler to determine where the memory is actually
used.

Also note that there is a low memory usage/ low GC pause / high
throughput trade-off. Very simply you can pick any two at the expense of
the third.

Mark

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