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Date: Wed, 19 Mar 2008 15:30:57 -0400
From: "Joshua Slive" <joshua@slive.ca>
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Subject: Re: [users@httpd] Re: apache process locks at 100% cpu usage

On Wed, Mar 19, 2008 at 10:42 AM, Evert Lammerts
<evert.lammerts@gmail.com> wrote:
> And how about this: after benchmarking apache with ab -c 100 -n 10000 an
>  apache process is left in the process list for a while with <defunct>
>  appended - it disappears after a minute or so.
>
>  If I benchmark the server from two different machines with two different
>  requests, apache locks up, the benchmarks time out and the server is
>  left with a process list filled with apache2 processes that need to be
>  killed with killall. It does seem to be a concurrency problem but I
>  can't figure out where it comes from. Any help would be great!

Session locking?

This is almost surely some kind of lock contention in your php code.
You can grab a live backtrace of a "stuck" process to see where the
problem is:
http://httpd.apache.org/dev/debugging.html#backtrace

Joshua.

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