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From Quintin Beukes <>
Subject Re: Starting Geronimo with More PermGen
Date Mon, 14 Sep 2009 16:42:07 GMT
Though I have to mention that these dumps will probably be huge, since
I would be running the server for much longer, doing many things in
between (compared to the other one that was just 2 deploys, and about
3 minutes of uptime).

I hope this is fine by you?

Sorry.. bandwidth might not be an issue for you guys. Over here it's
very expensive, so you tend to start treating it like our ancestors
treated food during a dry season... especially when you use a lot of
it already.


On Mon, Sep 14, 2009 at 6:31 PM, Quintin Beukes <> wrote:
> 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
> well.
> 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.
> Q
> 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

Quintin Beukes

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