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From Sander Temme <>
Subject Re: [users@httpd] Timeouts with Threaded Apache 2.2.3
Date Fri, 09 Feb 2007 16:41:08 GMT

On Feb 8, 2007, at 3:08 AM, Neil Martin wrote:

> so we retested with a dummy module call mod_foo ( attached ) but we  
> still get timeouts.
> Is this a know issue is the module api in threaded Apache ?

You clearly based your mod_foo on mod_example, and just about the  
only thing you deleted was the comment atop the file that warns the  
mod_example code is not thread-safe.  You should at least remove the  
call to trace_add() from the handler function, because that uses  
global variables and can't be used in a threaded server.

I'm trying to clean this up for the mod_example.c in our development  
trunk, but this has not been done for 2.2.x.

In a typical module (I think most if not all of your magic is in the  
handler function?), you don't need to implement any of the handlers  
unless you're actually using them to do something. You might override  
child_init to set up your database connection pool, but won't need  
stuff like post_read_request or http_scheme.

You can generate a very small, functional sample module by calling  
apxs -g -n foo

When running your benchmarks, you should make sure that you tune  
Apache in relation to the load you are sending it. The default worker  
mpm configuration tops out at 150 concurrent requests, and you are  
running ab at 200... that may not be a problem given the connection  
backlog in the kernel, but especially if your module takes some time  
to do its database thing, you may run out of resources and render ab  
confused. See conf/extra/httpd-mpm.conf to get an idea of the  
tunables for the worker MPM.


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