How to use cProfile with nosetest --with-profile?

Question

nosetest --with-profile --profile-stats-file output

The output can't read by runsnake, because nosetest uses hotshot, if I want to generate a file that can be read with runsnake, I need to convert it so:

st = hotshot.stats.load('output')

st.dump_stats('output_new')

Could I run the test with cProfile directly for read with runsnake?

Answer 1

Evolving on the answer of @squid, you can use a nose plugin called nose-cprof to replace the nose default profiler, hotshot, with cProfile.

To install it:

pip install nose-cprof

Then call nose like this:

nosetests --with-cprofile

It should generate a cProfile output file, that you can then analyze with tools like runsnakerun.

Answer 2

@cihanpesend's answer didn't quite work for me (cProfile couldn't find 'nosetests'), but I did have success on Linux using:

python -m cProfile -o profile.out `which nosetests` .

The resulting output works fine in runsnake.

(Presumably on Windows you could replace which nosetests with the hard-coded path to your nosetests top-level python script.)

I think you are right that the output from nosetests' hotshot profiler is not compatible with runsnake. Certainly the two don't play nice together out of the box for me either.