On Tue, 2011-10-18 at 11:32 +0200, Tom Evans wrote:
> On Mon, Oct 17, 2011 at 1:01 PM, Josu Lazkano
> <josu.lazkano@xxxxxxxxxxxxxxxxxx> wrote:
> > Hello list! I have a Ubuntu server with Apache2 to serve a Moodle web.
> >
> > I notice that where there are few users (4 or 5) requesting pages, the
> > Apache2 process goes to 100% on all CPUs (4 cores).
> >
> > I try with memcached but it still getting 100% CPU usage.
> >
> > What I must check? I will appreciate any help.
> >
> > Thanks and best regards.
> >
> >
>
> Moodle is a PHP framework.
> PHP scripts run embedded inside Apache*.
> High CPU usage in Apache whilst serving PHP pages is usually due to
> the PHP page.
>
> The best people to help with why the framework works so poorly are the
> people who wrote the framework.
>
> Cheers
>
> Tom
>
> * Usually. You can also run out of process, using FastCGI, which will
> quickly make clear how much work Apache is doing, and how much work
> PHP is doing. If you are using mod_php, its running embedded.
>
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Thanks Tom, I check the Moodle forum but I don't find any interesting
post about Apache performance.
I configure some parameters on my Apache but it still not work (I can
block the server just hitting the F5 key 10 times).
This is my Apache2:
$ apache2ctl -l
Compiled in modules:
core.c
mod_log_config.c
mod_logio.c
prefork.c
http_core.c
mod_so.c
And this is my configuration:
http://dl.dropbox.com/u/1541853/apache2.conf
I just change this values:
<IfModule mpm_prefork_module>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
MaxClients 256
MaxRequestsPerChild 4000
</IfModule>
Is possible to know witch PHP files is getting 100% of the CPU? Some
debugging tool for that?
I don't know what else to try. The server is a virtual one with 8GB of
memory and 4 CPUs, I think it is enough for a 50 user Moodle.
Thanks for your help.
Kind regards.
--
Josu Lazkano
Barcelona Media – Centre d’Innovació
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