quoting the httpd doc
"Prefork and worker are mutually exclusive modules. How did you compile
Apache? "
Check the output of "httpd -l".
find out which module you have compiled into your server then tune the settings
for that module
Martin
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> Date: Sat, 7 Mar 2009 10:34:41 -0500
> Subject: Tuning worker MPM
> From: kulbir.sai...@gmail.com
> To: users@tomcat.apache.org
>
> Hi,
>
> we have a web server with two apache instances running on that. Experiencing
> high load on server and the "top" shows httpd's taking CPU. The httpd.conf
> worker setting is -
>
> <IfModule worker.c>
> #ServerLimit 25
> StartServers 2
> MaxClients 300
> MinSpareThreads 75
> MaxSpareThreads 250
> ThreadsPerChild 25
> MaxRequestsPerChild 20000
> </IfModule>
>
>
> Looking at server resources, we dont find any memory issue & no swapping
> seen. the "vmstat" output shows that the run queue("r") increases higher
> thatn the number of CPU's on the server. Server has 2 dual Core Intel(R)
> Xeon(TM) CPU 3.06GHz.
>
> I feel since processes are going in CPU run queue it may happen apache is
> not tunned properly to handle requests though we dont see any crunch on
> server resources.
>
>
> Any suggestions?
>
> Also i would like to know the thumb rule calculations for
> configuring/tunning worker threads i..e how to decide on values for
> ServerLimit, Maxclient, Minspare threads ect etc.
>
>
> Thanks in advance
>
> Kulbir
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