If you use -XX:MaxPermSize=256m instead of -XX:PermSize=256m, the JVM 
will use its smaller default starting permsize and grow to the specified 
limit as needed. This will minimise your JVM footprint, at the cost of a 
small amount of JVM work each time the permgen is resized (typically 
when a servlet is used for the first time).

On 23/02/11 17:04, Holmqvist Fredrik wrote:
>
>> From: Simone Giannecchini
>> you need to increase PermGen space not the heap memory per se.
>
> You can change this with the command-line option -XX:PermSize=256m (for
> 256MB). Java loads class code and other things into memory in permgen.
> If you have a lot of classes you may run out of memory there.
>
> You can set it to a large value and then run 'jconsole' to connect to
> the java process and look what is actually used after some usage.
>
> Fredrik Holmqvist
> METRIA
> www.metria.se
>
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-- 
Ben Caradoc-Davies <[email protected]>
Software Engineering Team Leader
CSIRO Earth Science and Resource Engineering
Australian Resources Research Centre

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