You have a very poorly setup configuration. Your WSGI application can only
handle one request at a time. If one request takes a long time to run, it will
block out everything else and if it blocks for too long, it will timeout.
I would thus very much suggest not using processes=1 and threads=1 for daemon
mode.
You could also be suffering issues due to third party C extension modules which
will not working in sub interpreters and which block and cause process to hang,
thus invoking mod_wsgi deadlock timeout.
I would suggest using:
WSGIApplicationGroup %{GLOBAL}
Also go watch:
http://lanyrd.com/2013/pycon/scdyzk
which explains various stuff about Apache configuration for mod_wsgi.
Graham
On 18/09/2013, at 9:13 AM, Fini Decima <[email protected]> wrote:
> What I've observed is that after every 3 or 4 page loads, the sites takes a
> long time to load. And after it loads, the process repeats itself.
>
>
>
>
> On Monday, September 16, 2013 9:29:47 PM UTC-5, Fini Decima wrote:
> I have an installation of MediaCore, a media serving application built atop
> the Django framework I have i running on Apache2 using mod_wsgi.
>
> Sometimes it works, other times, it also works, but it takes forever to load,
> and I get some error messages in Apache's error file like these: =
>
> <code>
>
> [error] [client IP-ADDR] Script timed out before returning headers:
> mediacore.wsgi, referer: http://IP-ADDR/
> [error] [client IP-ADDR] Script timed out before returning headers:
> mediacore.wsgi, referer: http://IP-ADDR/
> [error] [client IP-ADDR] Script timed out before returning headers:
> mediacore.wsgi, referer: http://IP-ADDR/
> [error] [client IP-ADDR] Script timed out before returning headers:
> mediacore.wsgi, referer: http://IP-ADDR/
> [error] [client IP-ADDR] Script timed out before returning headers:
> mediacore.wsgi
> [error] [client IP-ADDR] Script timed out before returning headers:
> mediacore.wsgi, referer: http://IP-ADDR/
> [error] [client IP-ADDR] Script timed out before returning headers:
> mediacore.wsgi, referer: http://IP-ADDR/
> [info] [client IP-ADDR] (70007)The timeout specified has expired:
> core_output_filter: writing data to the network
> [info] [client IP-ADDR] (70007)The timeout specified has expired:
> core_output_filter: writing data to the network
> [error] [client IP-ADDR] mod_wsgi (pid=25066): Exception occurred processing
> WSGI script '/var/www/mediacore.wsgi'.
> [error] [client IP-ADDR] IOError: failed to write data
> [info] [client IP-ADDR] (32)Broken pipe: core_output_filter: writing data to
> the network
> [info] [client IP-ADDR] (32)Broken pipe: core_output_filter: writing data to
> the network
>
> </code>
>
> Even as I'm writing this, a video I clicked several minutes ago is still
> trying to load.
>
> Here's my media.wsgi file
>
> <code>
>
> activate_this = '/var/www/virtualECK/bin/activate_this.py'
>
> execfile(activate_this, dict(__file__=activate_this))
>
>
>
> deployment_config = '/var/www/deployment.ini'
>
> temp_dir = '/var/www/data/tmp'
>
>
>
> # NOTE: Before running MediaCore, you will need to update the two paths
>
> # above to point to the appropriate locations for your installation.
>
>
>
> import os
>
> os.environ['TMPDIR'] = temp_dir
>
>
>
> if __name__.startswith('_mod_wsgi_'):
>
> # Set up logging under mod_wsgi
>
> from paste.script.util.logging_config import fileConfig
>
> fileConfig(deployment_config)
>
> # Load the app!
>
> from paste.deploy import loadapp
>
>
> application = loadapp('config:'+deployment_config)
>
> </code>
>
>
>
> And here's my VirtualHost configuration:
>
>
>
> <code>
>
> <VirtualHost *:80>
>
> ServerAdmin *
>
>
>
> DocumentRoot /var/www
>
> # For best performance the number of processes should equal the
> number of CPU
>
> # cores (but please note that each process may use about 500 MB RAM).
>
> WSGIDaemonProcess eckmedia user=www-data group=www-data \
>
> processes=1 \
>
> threads=1 \
>
> display-name=%{GROUP} \
>
> python-path=/var/www/virtualECK/lib/python2.7/site-packages \
>
> python-eggs=/var/www/data/python-egg-cache
>
> WSGIProcessGroup eckmedia
>
> # Intercept all requests to /* and pass them to mediacore.wsgi
>
> WSGIScriptAlias / /var/www/mediacore.wsgi process-group=eckmedia
> application-group=%{GLOBAL}
>
>
>
> <Directory />
>
> Options FollowSymLinks
>
> AllowOverride None
>
> </Directory>
>
> <Directory /var/www/>
>
> Options Indexes FollowSymLinks MultiViews
>
> AllowOverride None
>
> Order allow,deny
>
> allow from all
>
> </Directory>
>
>
>
> # Make all the static content accessible.
>
> <Directory /var/www/eckmedia/mediacore/public/*>
>
> Order allow,deny
>
> Allow from all
>
> Options -Indexes
>
> WSGIScriptReloading On
>
> </Directory>
>
> ErrorLog ${APACHE_LOG_DIR}/error.log
>
> LogLevel info
>
>
> CustomLog ${APACHE_LOG_DIR}/access.log combined
>
>
> </code>
>
>
>
> And in Apache2.conf, I have:
>
> <code>
>
> # prefork MPM
>
> <IfModule mpm_prefork_module>
>
> StartServers 7
>
> MinSpareServers 5
>
> MaxSpareServers 10
>
> MaxClients 150
>
> MaxRequestsPerChild 0
>
>
> </IfModule>
>
> </code>
>
> Any ideas what could be causing the errors?
>
> TIA
>
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