Re: Very slow page load in production with mod_wsgi

On Sep 3, 7:45 pm, Dirk Eschler <esch...@gmail.com> wrote:
> Hello,
>
> i experience slow page loads in production using mod_wsgi. The django
> debugging toolbar reveals a very high CPU use with lots of voluntary context
> switches:
>
> Production (Apache mod_wsgi-3.2, daemon mode, 10 threads):
> User CPU time    3580.224 msec
> System CPU time  156.010 msec
> Total CPU time   3736.234 msec
> Elapsed time     3671.237 msec
> Context switches 21573 voluntary, 108 involuntary
>
> Same page compared using the dev server:
>
> Development (Django dev server):
> User CPU time    90.987 msec
> System CPU time  5.999 msec
> Total CPU time   96.986 msec
> Elapsed time     99.323 msec
> Context switches 0 voluntary, 51 involuntary
>
> SQL queries doesn't seem to be the problem. I reduced the number of queries to
> 1 or 2 using johnny-cache, but the CPU time is still nearly the same as in the
> above example.
>
> The load of the server is somewhere around 0.1 to 0.3 so this can't be the
> problem either.

Is this on an initial request to the application or all requests?

Is this only for a specific URL of your application or all URLs?

What is the actual mod_wsgi configuration snippet from Apache
configuration file?

Have you confirmed in some way that your application is in fact
running in daemon mode?

What Apache MPM are you using?

What is MaxRequestPerChild set to in your Apache configuration?

Graham

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