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From "Adrian Marsh" <Adrian.Ma...@ubiquisys.com>
Subject RE: [users@httpd] Apache memory hog
Date Tue, 07 Apr 2009 13:22:32 GMT
Thanks guys for the help so far...

Lets just pretend for a moment that I don't know much about Apache, pthreads or pre-forks
in any specific detail... how would I find out what threading model is being used?  Ulimit
does return 10240 on the command line.  Should I put the ulimit -s 2048 into the init.d script
for httpd ?

As a side project, I'm trying to get my basic SSL and LDAP config working in Collab.nets version
of subversion, which includes an apache binary custom for them I believe. I think I almost
have that working, so I plan to switch the system over to that, and see if the problem still
occurs.  If it does, then I may have an official support route to follow.

Adrian


-----Original Message-----
From: Eric Covener [mailto:covener@gmail.com] 
Sent: 07 April 2009 01:50
To: users@httpd.apache.org
Subject: Re: [users@httpd] Apache memory hog

On Mon, Apr 6, 2009 at 7:54 PM, Sean Conner <spc@conman.org> wrote:
> It was thus said that the Great Eric Covener once stated:
>> On Fri, Apr 3, 2009 at 10:08 AM, Adrian Marsh
>> <Adrian.Marsh@ubiquisys.com> wrote:
>> > Am trying MaxMemFree 30000    (30mb? - pure guess number).
>>
>> Far too large, it's per-thread. Try 1MB.
>
>  This triggered something I recently learned---what threading model are you
> using under Apache?  Pre-fork?  Or pthreads?  I ask because pthreads will
> allocate stack space for each thread, and the amount used is the default
> mount allocated per stack per process:
>
>        http://boston.conman.org/2007/11/05.1
>
>  Rather nasty shock when I found out.

The wasted stack space doesn't shows up as a high VSZ, but not RSS.

-- 
Eric Covener
covener@gmail.com

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