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From David Griffiths <>
Subject Re: JSR 326 and Apache Kato - A "state of the nation" examination
Date Thu, 21 Jan 2010 09:49:00 GMT
Hi Alois, could you please give some examples of the kind of
information you would like to see in a heap memory snapshot? You
earlier mentioned monitoring the number of instances of a particular
class. Do you think that obtaining that kind of info via JVMTI (eg
IterateOverInstancesOfClass) is insufficient?



On Thu, Jan 21, 2010 at 9:11 AM, Alois Reitbauer
<> wrote:
> David,
> good point. What we mostly see are heap memory issues. However from time to time there
are native memory problems as well.  So I would see them as a second priority item from the
point of an application developer. In the native areas the most prominent problems I am aware
of are resource leaks like sockets, (file) handles etc.  Another memory related issues is
what I would name "perm gen" diagnosis - while being well aware that this is a Sun term.  Understanding
which classes got loaded and how big they are is an issue I also see now more frequently.
> Cheers,
> Alois
> -----Original Message-----
> From: David Griffiths []
> Sent: Mittwoch, 20. Jänner 2010 16:36
> To:
> Subject: Re: JSR 326 and Apache Kato - A "state of the nation" examination
> Hi Alois, when you talk about memory do you mean Java heap or do you mean all memory
including native?
> Cheers,
> Dave

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