We've got several instances of a django application (basically the
same code, but different settings files) running under modwsgi 2.8.
We initially had them running under a single WSGIProcessGroup, but saw
some occasional bugs with this and realized that each instance needed
a separate process group. We switched to one WSGIDaemonProcess and
WSGIProcessGroup per VirtualHost, configured basically as follows:
WSGIDaemonProcess foo user=www-data group=www-data processes=2
threads=6 maximum-requests=1000 display-name=foo
When we made the change, the original errors disappeared, but we've
got a new problem. Every now and then apache just completely freezes
up, across all the process groups, and the only thing to do is an
apache restart. There's nothing meaningful in the apache logs. We
tried adding "deadlock-timeout=90" to the process groups, thinking it
might be a deadlock trying to get the GIL, but the very next hang
lasted well over this timeout.
Any thoughts on what might be causing this or suggestions on where to
investigate more? Thanks.
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