Hello,
I have a Flask + Sqlalchemy application(connecting to a Sybase database)
that I am trying to run in Apache + mod_wsgi setup
Few pointers on my wsgi setup:
- Using WSGIDaemonProcess <nameOfApp> processes=x threads=y
- Using WSGIApplicationGroup %{GLOBAL}
No matter what combination of values of *x* and *y* I use, after processing
some request, my apache/mod_wsgi hangs up for sometime showing logs like :
- Daemon process deadlock timer expired, stopping process <>
- Shutdown process <nameOfApp>
- Aborting process <nameOfApp>
- Exiting process <nameOfApp>
I believe it hangs for 300 seconds(which is default deadlock-timeout)
If I set deadlock-timeout = 60, apache/mod_wsgi recovers in 60sec
Few other logs that I see are :
- Truncated or oversized response headers received from daemon process
<nameOfApp>
- server seems busy, (you may need to increase StartServers, or
Min/MaxServers, spawning 16 children, there are three idle
What could be the reason of this deadlock and other logs shown above?
Could this be because of a rogue C extension as pointed out by Graham at
various places?
There are bunch of third party modules that I am using which has C
extension like -> http://python-sybase.sourceforge.net/download.html
Is there anyway to fix this or make it more stable(not going into deadlock
too frequently and giving 500 to clients)?
FYI, I am using prefork instead of worker at this moment. I am not loading
unnecessary modules like mod_php.
The only modules that I am loading in my apache conf are
"mod_authz_host.so", "mod_log_config.so" and "mod_wsgi.so"
I believe the issue I am trying to highlight is totally independent of
whether it is a prefork or worker setup
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