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From Quintin Beukes <>
Subject Re: Starting Geronimo with More PermGen
Date Mon, 14 Sep 2009 16:31:30 GMT
I'm running with that now, but since the last time i haven't deployed
much without restarting the server. So whenever it does happen I'll
put it on a server and send you the link. Luckily they compress quite

Also, since the bandwidth is going to be used anyway, I can upload it
to a local public FTP, meaning you'll probably get faster download
next time.


On Mon, Sep 14, 2009 at 5:06 PM, Kevan Miller <> wrote:
> On Sep 14, 2009, at 10:07 AM, Quintin Beukes wrote:
>> Doesn't Sun have a GC on the PermGen? Or is it just low priority,
>> meaning this won't happen on production servers. Even in a the common
>> production host you deploy a lot. They might be further apart, but
>> they are many none the less. And these servers are usually solid,
>> meaning they don't fall over. I will easily reach 10 deployments
>> without a server restart.
> Yes, PermGen is GC'ed. However, if there is a ClassLoader memory leak, then
> a ClassLoader (and associated classes) can't be GC'ed, even though the
> application has been undeployed.
>> Though on my dev machine I have gone to about 20 deployments (around
>> there - I just counted the log entries from server start while
>> pressing page down the whole time and counted 18) before it gave a
>> permgen. This was in a 2 hour period.
>> If this is going to be a problem, is JRocket expensive?
> I assume that JRockit stores class meta data in heap space. So, just means
> you have more storage for your class meta data, rather than specialized
> PermGen.
> If you recreate your OOME PermGen with -XX:+HeapDumpOnOutOfMemoryError, we
> can help diagnose your problem. One of these days, I'll write a blog on
> this...
> --kevan

Quintin Beukes

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