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From "Joshua Slive" <jos...@slive.ca>
Subject Re: [users@httpd] Excessive memory consumption
Date Tue, 06 Jun 2006 15:12:17 GMT
On 6/6/06, John Morrissey <jwm@horde.net> wrote:
> I'm having a problem with Apache 2.0.54 (we're running the Debian packages
> for 2.0.54-5). Periodically, a single Apache child will rapidly consume all
> available memory on the machine - once the memory consumption starts, it
> only takes five or ten minutes (at most) for it to exhaust available memory.
>
> We're running it on a cluster of four identical machines (hardware, OS,
> configuration, etc.) and are seeing this problem across all of them.
> Right now, we have a cron job that spawns every five minutes to kill off
> errant children, and it's triggered a handful of times per day on these
> machines.
>
> Some configuration details:
>
> - Prefork MPM
> - Modules: cgi headers include ldap_userdir mime_magic php4 rewrite userdir
>
> Most content is static (HTML pages, images, etc.). This cluster takes fairly
> little PHP traffic, but what PHP it does do is important, so I can't disable
> PHP for testing. We have another cluster that takes heavy PHP traffic (~95%
> of its total hits) on identical hard/software versions that run with no
> problem, so I'm inclined to rule PHP out.
>
> Here's an example of an errant process before it was killed by our cron job:
>
> USER       PID %CPU %MEM   VSZ  RSS TTY      STAT START   TIME COMMAND
> www-data 10354  0.0 88.5 2861024 1839504 ?   D    14:06   0:37 /usr/sbin/apache2+-k start
-DSSL

Change your LogFormat to include the PID of the serving process.  Then
you can go back and correlate teh PID of the memory hog with the
requests it recently served.  (See also mod_log_forensic, which will
be necessary if the bad request never finishes.)

Joshua.

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