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Flask: how does gevent.pywsgi differ from usgi w.r.t. os forking?


How to randomly select an item from a list?How do you read from stdin?Why does comparing strings using either '==' or 'is' sometimes produce a different result?Importing files from different folderHow to get data received in Flask requestGunicorn+flask+pymongo+gevent hangs on initializationHow do I create an asynchronous task with uwsgi/gevent/flask that uses the request context?“Empty reply from server” for Flask + uWSGI setupAccess flask.g inside greenletIntegrating keras with flask and wsgi






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0















I have a Flask application that uses a messaging library that is NOT process safe (multiple processes using the same pointer results in a panic: not fork-reentrant error)



I've noticed that there is a large difference between the options on this flask page: http://flask.pocoo.org/docs/1.0/deploying/wsgi-standalone/



Gevent works for my application. I never get into a panic.



UWSGI does not work for my application; it panics as soon as the second request comes in.



Is the following understanding correct then?
Gevent works using greenlet which is a coutourtine library, but it executes all within a single process.
UWSGI launches a new process for each incoming request, so upon the second request, a process is launched and the shared memory is access which causes the panic.



I guess my high level question is what the exact difference between uwsgi and gevent.pywsgi is>?










share|improve this question






















  • What is your uwsgi config?

    – Fian
    Mar 25 at 12:52











  • @Fian I am using this project, and it seems to have a VERY terse uwsgi: github.com/tiangolo/uwsgi-nginx-flask-docker/blob/master/…

    – Tommy
    Mar 25 at 13:41

















0















I have a Flask application that uses a messaging library that is NOT process safe (multiple processes using the same pointer results in a panic: not fork-reentrant error)



I've noticed that there is a large difference between the options on this flask page: http://flask.pocoo.org/docs/1.0/deploying/wsgi-standalone/



Gevent works for my application. I never get into a panic.



UWSGI does not work for my application; it panics as soon as the second request comes in.



Is the following understanding correct then?
Gevent works using greenlet which is a coutourtine library, but it executes all within a single process.
UWSGI launches a new process for each incoming request, so upon the second request, a process is launched and the shared memory is access which causes the panic.



I guess my high level question is what the exact difference between uwsgi and gevent.pywsgi is>?










share|improve this question






















  • What is your uwsgi config?

    – Fian
    Mar 25 at 12:52











  • @Fian I am using this project, and it seems to have a VERY terse uwsgi: github.com/tiangolo/uwsgi-nginx-flask-docker/blob/master/…

    – Tommy
    Mar 25 at 13:41













0












0








0








I have a Flask application that uses a messaging library that is NOT process safe (multiple processes using the same pointer results in a panic: not fork-reentrant error)



I've noticed that there is a large difference between the options on this flask page: http://flask.pocoo.org/docs/1.0/deploying/wsgi-standalone/



Gevent works for my application. I never get into a panic.



UWSGI does not work for my application; it panics as soon as the second request comes in.



Is the following understanding correct then?
Gevent works using greenlet which is a coutourtine library, but it executes all within a single process.
UWSGI launches a new process for each incoming request, so upon the second request, a process is launched and the shared memory is access which causes the panic.



I guess my high level question is what the exact difference between uwsgi and gevent.pywsgi is>?










share|improve this question














I have a Flask application that uses a messaging library that is NOT process safe (multiple processes using the same pointer results in a panic: not fork-reentrant error)



I've noticed that there is a large difference between the options on this flask page: http://flask.pocoo.org/docs/1.0/deploying/wsgi-standalone/



Gevent works for my application. I never get into a panic.



UWSGI does not work for my application; it panics as soon as the second request comes in.



Is the following understanding correct then?
Gevent works using greenlet which is a coutourtine library, but it executes all within a single process.
UWSGI launches a new process for each incoming request, so upon the second request, a process is launched and the shared memory is access which causes the panic.



I guess my high level question is what the exact difference between uwsgi and gevent.pywsgi is>?







python flask gevent






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 24 at 2:08









TommyTommy

5,28663562




5,28663562












  • What is your uwsgi config?

    – Fian
    Mar 25 at 12:52











  • @Fian I am using this project, and it seems to have a VERY terse uwsgi: github.com/tiangolo/uwsgi-nginx-flask-docker/blob/master/…

    – Tommy
    Mar 25 at 13:41

















  • What is your uwsgi config?

    – Fian
    Mar 25 at 12:52











  • @Fian I am using this project, and it seems to have a VERY terse uwsgi: github.com/tiangolo/uwsgi-nginx-flask-docker/blob/master/…

    – Tommy
    Mar 25 at 13:41
















What is your uwsgi config?

– Fian
Mar 25 at 12:52





What is your uwsgi config?

– Fian
Mar 25 at 12:52













@Fian I am using this project, and it seems to have a VERY terse uwsgi: github.com/tiangolo/uwsgi-nginx-flask-docker/blob/master/…

– Tommy
Mar 25 at 13:41





@Fian I am using this project, and it seems to have a VERY terse uwsgi: github.com/tiangolo/uwsgi-nginx-flask-docker/blob/master/…

– Tommy
Mar 25 at 13:41












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