Thanks for the reply. I tried adding --lazy-apps, but the hang still occurred. For now I've decided not to investigate this further, but I hope this information was useful.
Thanks. On Tue, Jul 2, 2013 at 7:02 AM, Roberto De Ioris <[email protected]> wrote: > > > Hi, > > > > I encountered a problem where using uwsgi --gevent-monkey-patch would > > cause > > hangs. Is it possible that the monkey patching is possibly done too late? > > Here's my setup: > > > > SQLAlchemy 0.8.1 > > PyMySQL 0.5 > > gevent 1.0rc2 > > uwsgi 1.9.12 > > nginx 1.4.0 (probably not relevant) > > > > uWSGI command line: > > > > uwsgi --socket mysite.sock --wsgi-file app.py --chmod-socket=666 > > --processes 2 -l 5000 -L --daemonize log --gevent 512 > > --gevent-monkey-patch > > > > This is the Python app I was running: > > > > https://gist.github.com/MalcolmEvershed/5862679 > > > > When I had 256 concurrent HTTP Keep-Alive connections requesting /dbsraw, > > the app would hang. Then if I remove --gevent-monkey-patch from the uWSGI > > command line, and I instead use "from gevent import monkey; > > monkey.patch_all()" at the top of app.py, there is no hang and everything > > works fine. > > > > My theory is that SQLAlchemy uses various threading primitives to block > > threads/greenlets when implementing database connection pooling, and if > > those primitives aren't monkey patched properly, then this results in a > > hang. But I could be wrong. > > > > Anyway, I wanted to give a heads-up in case this issue isn't already > known > > about, or if I'm doing something wrong. > > > > Thanks. > > _______________________________________________ > > uWSGI mailing list > > [email protected] > > http://lists.unbit.it/cgi-bin/mailman/listinfo/uwsgi > > > > i would try adding --lazy-apps (to load the app one time per process). > SQLAlchemy can have lots of unexpected behaviours when you call fork() > after its setup > > -- > Roberto De Ioris > http://unbit.it > _______________________________________________ > uWSGI mailing list > [email protected] > http://lists.unbit.it/cgi-bin/mailman/listinfo/uwsgi >
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