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Re: [Issue 1563] New - TTimo's mysterious 'stalling' checkout

From: Brandon Ehle <azverkan_at_yahoo.com>
Date: 2003-10-22 19:51:34 CEST

Timothee Besset wrote:

>Well, would you have more precise informations about the problems you had
>with prefork, was it reported somewhere? Any precisions on the symptoms? I
>might switch to worker (I do have to recompile httpd for that, right?),
>but I still have to find a good explanation on the various threading
>models..
>
>
>
Well, for the mpm stuff, there is this link
http://httpd.apache.org/docs-2.0/mpm.html

If I remember correctly, when I started to track down why the hang was
occurring, the first thing I did was recompile httpd, apr, apr-util,
neon, mod_dav, and mod_dav_svn with optimizations on and -g turned on as
well. If this is all new to you, the first thing I'd recommend is
setting up a script to run lsstack (pstack) on all the apache processes
(and threads if you were using worker or threadpool). If it doesn't
show any symbols in your log, then you should recompile at least
mod_dav_svn with -g.

When I was tracking down my hang, I ran apache with lsstack logging to a
file in 1 second intervals and then I went and hung the server. The
resulting log was more than enough information to take a guess at what
was going wrong.

lsstack for Linux (comes with some distros nowadays)
http://sourceforge.net/projects/lsstack/

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Received on Wed Oct 22 19:52:10 2003

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