Profil flask app

[xlqian]

Hello, is there anyway that I can profile a flask app with profiling?

[sublee]

There's nothing special to profile a Flask app if you can run the Web server by a Python file.

# run_server.py
from hello import app
if __name__ == '__main__':
    app.run(port=5000)

$ profiling live run_server.py

If you use flask run command, try -m option and -- delimiter:

$ FLASK_APP=hello.py profiling live -m flask run -- -h 0.0.0.0 -p 5555

[sinanm89]

I was able to run the profiler but the output only shows click and werkzeug steps. Cant really see which endpoint/which model method calls are being the bottleneck.

command I used;
profiling --dump=profiler/blah.prf -S -m flask run -- -h 0.0.0.0 -p 5000 --no-reload

[sublee]

@sinanm89 Would you try flask run with --without-threads?

[sinanm89]

Hah! That worked. I actually have the post methods now. Thanks so much for your hard work and suggestions @sublee , I'd say you can close this issue.

reiterating the working command to profile a flask app for anyone else stumbling around;

$ profiling --dump=blah.prf -S -m flask run -- -h 0.0.0.0 -p 5000 --no-reload --without-threads

[simkessy]

I'm running my app through uwsgi in a docker container, where do I run profiling?