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From: Kjetil Kjernsmo <kjetilk@opera.com>
Organization: Opera Software ASA
To: modperl@perl.apache.org
Subject: Re: Loading at startup to use shared memory
Date: Wed, 8 Nov 2006 16:26:19 +0100
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On Tuesday 07 November 2006 17:17, Torsten Foertsch wrote:
> You can directly look at /proc/<PID>/smaps or use Linux::Smaps. I
> don't know what GTop does but I know how /proc/<PID>/smaps work.
> Also, don't do it too often. Reading from /proc/<PID>/smaps is really
> expensive particularly for large process sizes.

Wow. Yeah, that's really interesting! So, I started to dive into what 
this means... I have a lot to learn here... Thanks, I'll be 
investigating.

> Maybe I forgot to say in the docs, /proc/<PID>/smaps cannot determine
> if a page is shared or private if it is out of core (paged out).
> Hence to make your measurement accurate you must lock the parent
> apache in core or turn off swapping completely.

Heh, that's no problem, because our sysadmin insists that swapping 
sucks, so there is no swap on those boxes...

Cheers,

Kjetil
-- 
Kjetil Kjernsmo
Information Systems Developer
Opera Software ASA