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From Stefano Mazzocchi <>
Subject Re: Memory greed investigation
Date Wed, 12 Jul 2000 00:08:09 GMT
Yann wrote:
> Hi Cocooners,
> I have recently been investigating why my Cocoon 1.7.4 -based NT server eats
> so much memory without some of it being reclaimed when documents are served.
> So I downloaded a 7 days evaluation copy of KLGroup's JProbe.
> I did a test on a Cocoon XSP page using the XSP SQL tag lib that is supposed
> to return around 86kb of data. JProbe showed that an ElementImpl object was
> used to construct the XML tree. That object was garbaged collected, no
> problem. A lot of String and char[] were allocated in memory and I suspect
> it comes from the XSP cache. However after requesting the same page a couple
> of times I noticed that some Xerces objects were not garbaged collected
> (including the ElementImpl none).

> Is that an issue known within the Cocoon development team?

If it's not in the cache, no, it's a memory leak.
> I can't afford to have the NT box memory eaten up bit by bit until the VM
> crashes (and it did).

Of course, nobody would like this.

> Or is that a more general Java issue?

Have you tried different JVMs?
> Thx,
> Yann.
> P.S. I originally thought it was a JDBC memory leak issue but I now think
> it's a Cocoon issue.

It may be. Can you please tell us more about it? I'm sure this interests
almost everyone around here.

Stefano Mazzocchi      One must still have chaos in oneself to be
                          able to give birth to a dancing star.
<>                             Friedrich Nietzsche
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