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From Gregor Schneider <>
Subject Re: Strange memory-behaviour using Tomcat Native
Date Thu, 08 Apr 2010 13:56:52 GMT
Hi Mark,

On Thu, Apr 8, 2010 at 1:48 PM, Mark Thomas <> wrote:
> On 08/04/2010 12:12, Gregor Schneider wrote:
>> Anybody has an idea what I might be missing here?
> That Java Heap Space + Perm Gen Space < OS process Space
> You are missing the memory used for:
> - native code
> - gc
> - thread stacks

I'd agree to that, however, somehow it suprises me that almost 1/2 a
GB is used for native, gc, threads & stuff - wasn't aware that it is
that much, specifically, that the memory-usage of said components
seems to be increasing even further when enhancing Xmx / Xmx.


When using Xms/Xmx = 512M, MaxpermSize=384M, then the overall
footprint is a bit less than 1GB

When using Xmx/Xmx=1GB, MaxpermSize=384M, the overall footprint is 1.6GB.

That means, for those "administrative" stuff in the first example less
than 100M is used, but in the 2nd example it's more than double the
size - is such a common behaviour?


just because you're paranoid, don't mean they're not after you...
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