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From "Caldarale, Charles R" <Chuck.Caldar...@unisys.com>
Subject RE: soory I am starting new thread for new problem
Date Wed, 23 Jun 2010 18:11:46 GMT
> -----Original Message-----
> From: yuccanel@live.co.za [mailto:yuccanel@live.co.za]
> Subject: soory I am starting new thread for new problem

No, you're hijacking yet another thread.  Stop doing that.

> --------------------------------------------------
> From: "Christopher Schultz" <chris@christopherschultz.net>
> Sent: Wednesday, June 23, 2010 7:00 PM
> To: "Tomcat Users List" <users@tomcat.apache.org>
> Subject: Re: Showing Tomcat Memory Utilization with 'top'
> 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Chuck,
> >
> > On 6/22/2010 5:00 PM, Caldarale, Charles R wrote:
> >>> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> >>> Subject: Re: Showing Tomcat Memory Utilization with 'top'
> >>>
> >>> Also, I believe VIRT includes memory shared with other processes
> >>
> >> Doesn't RES also include shared pages - anything that's in the
> memory
> >> map of the process?  (I can't remember exactly how that works, but
> >> the shared pages have to be accounted for somewhere.)
> >
> > This is reaching the limits of my knowledge as well. I could imagine
> > shared memory not being counted "against" every process but it also
> > quite makes sense that it would.
> >
> >>> so if you have 50MiB of Java system classes loaded and a modern
> >>> JVM which shares them among running JVMs
> >>
> >> Note that only the client HotSpot JVM shares classes; the server
> >> version does not.  (The sharing is really class templates, not the
> >> class objects themselves.)
> >
> > I didn't realize that the server JVM didn't share class templates. Do
> > you have any ideas why not? It seems to be a relatively cheap
> > optimization when multiple JVMs are in use, and shouldn't include too
> > much overhead for either the process or the OS if there's no actual
> > sharing going on in a single-JVM scenario.
> >
> > - -chris
> > -----BEGIN PGP SIGNATURE-----
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> > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
> >
> > iEYEARECAAYFAkwiPcQACgkQ9CaO5/Lv0PA9oACcCAVoKQZ3F9DG5iPmEusC0nSt
> > k/wAnjfHzZpGU2lceqY7cltkJ/EUiNk9
> > =sw+t
> > -----END PGP SIGNATURE-----
> >
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 - Chuck


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