On 18/09/2013, at 10:47 AM, Graham Dumpleton <[email protected]> wrote:
> 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}
Oh, you already use:
application-group=%{GLOBAL}
to WSGIScriptAlias, which does the same things.
Because you are using process-group option to WSGIScriptAlias, then
WSGIProcessGroup is actually redundant.
Graham
>
> 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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