Running Flask with Gunicorn

Been playing with Python Flask writing some backend REST API for our game backend.
Trying to work on deploying the API using Gunicorn using gevent

sudo apt-get install libevent-1.4-2
sudo apt-get install libevent-dev

easy_install greenlet
easy_install gevent

My Gunicorn config file:

$ cat 

import os

def numCPUs():
    if not hasattr(os, "sysconf"):
        raise RuntimeError("No sysconf detected.")
    return os.sysconf("SC_NPROCESSORS_ONLN")

bind = ""
workers = numCPUs() * 2 + 1
backlog = 2048
#worker_class ="sync"
worker_class =  "gevent" 
debug = True
daemon = True
pidfile ="/tmp/"
logfile ="/tmp/gunicorn.log"

Running the Flask Application:

$ gunicorn -c mp:app 
$ tail /tmp/gunicorn.log
2011-04-19 10:33:40 [1594] [INFO] Starting gunicorn 0.12.1
2011-04-19 10:33:40 [1594] [INFO] Listening at: (1594)
2011-04-19 10:33:40 [1594] [INFO] Using worker: gevent
2011-04-19 10:33:40 [1595] [INFO] Booting worker with pid: 1595
2011-04-19 10:33:40 [1596] [INFO] Booting worker with pid: 1596
2011-04-19 10:33:40 [1597] [INFO] Booting worker with pid: 1597

Woops.. seems working.
Time to run load testing with ab and siege.

2 thoughts on “Running Flask with Gunicorn

  1. angelmedrano

    Have you tried your Flask + gunicorn set up via supervisord? Im having some issues and wondering if you ran into any weirdness.

  2. rodney Post author

    Hi Angel,
    I’m sure you have check the logs for any possible errors. I haven’t used supervisord for Flask+gunicorn yet.

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