CODEWITHSUNDEEP
pythonflaskgunicorn
Johnston
Johnston

Reputation: 20844

Flask/Gunicorn with 4 workers: Does long polling block a worker?

I wrote something like this (with more code, the important part is the sleep(5)): 

def get(self):
    import time
    time.sleep(5)
    return jsonify({'result':'OK'})

I start my server like this: 

gunicorn serve:app -b 127.0.0.2:8000 -w 4

While the app is "sleeping" is that blocking a whole worker? How does this affect gunicorn's ability to respond?

Upvotes: 8

Views: 4169

Answers (1)

DazWorrall
DazWorrall

Reputation: 14200

gunicorn will default to using synchronous workers, which will only serve one request at a time, so yes will consume that worker for the lifetime of the long poll. gunicorn does support asynchronous workers, which will allow a worker to serve other requests along side the long poll - see choosing a worker type:

gunicorn -k gevent -b 127.0.0.1:8000 serve:app

Upvotes: 9

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