profile/cProfile

John Melesky (PDX Python, May 2010)

In the standard library

• hotshot
• timeit
• profile/cprofile/pstats

hotshot

timeit

profile/cProfile

Instead of:

if __name__ == '__main__':
    main()

Do:

if __name__ == '__main__':
    import cProfile
    cProfile.run('main()')

Questions?

Need more detail!

Need more detail!

Instead of:

if __name__ == '__main__':
    import cProfile
    cProfile.run('main()')

Do:

if __name__ == '__main__':
    import cProfile
    cProfile.run('main()', 'myinfo.prof')

side note

If you need to set up an environment, you can use cProfile.runctx(command, globals, locals).

Need more detail!

Then:

#!/usr/bin/env python

import pstats

p = pstats.Stats('myinfo.prof')
p.strip_dirs().sort_stats("time").print_stats(50)

pstats

• strip_dirs
• sort_stats: "calls", "cumulative", "pcalls", "time", etc
• print_stats: restrictable (number of rows, regular expression)

pstats

Also:

• print_callers
• print_callees
• reverse_order
• dump_stats

pstats

Finally:

• add

Whine whine whine

It's only usable from the command line!

It's been wrapped

See, for example, repoze.profile.

Questions?