On Tue, Apr 7, 2009 at 9:22 AM, Adrian Marsh <Adrian.Marsh@xxxxxxxxxxxxx> wrote:
> 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?
The thread model is determined at compile time. At your system
prompt, you can issue: apache2 -l or, for a little clearer picture,
apache2 -V and the server MPM will be clearly stated in lines
7-9.....for example:
Server version: Apache/2.2.8 (Ubuntu)
Server built: Jun 25 2008 13:54:13
Server's Module Magic Number: 20051115:11
Server loaded: APR 1.2.11, APR-Util 1.2.12
Compiled using: APR 1.2.11, APR-Util 1.2.12
Architecture: 32-bit
Server MPM: Prefork
threaded: no
forked: yes (variable process count)
Server compiled with....
-D APACHE_MPM_DIR="server/mpm/prefork"
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_SYSVSEM_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=128
-D HTTPD_ROOT=""
-D SUEXEC_BIN="/usr/lib/apache2/suexec"
> 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@xxxxxxxxx]
> Sent: 07 April 2009 01:50
> To: users@xxxxxxxxxxxxxxxx
> Subject: Re: Apache memory hog
>
> On Mon, Apr 6, 2009 at 7:54 PM, Sean Conner <spc@xxxxxxxxxx> 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@xxxxxxxxxxxxx> 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@xxxxxxxxx
>
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