[Python-Dev] Request review of cProfile/profile series issue

[Wes Turner]

On Sun, Apr 23, 2017 at 11:12 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> On 23 April 2017 at 13:21, Louie Lu <me at louie.lu> wrote:
> > Hi all,
> >
> > I'm now looking for cProfile/profile lib's issue, and have solve a
> series of
> > dependent problem, here is the list:
> >
> > #9285 - Add a profile decorator to profile and cProfile
>

%prun -s
Src:
https://github.com/ipython/ipython/blob/master/IPython/core/magics/execution.py#L187
Docs:
https://ipython.readthedocs.io/en/stable/interactive/magics.html#magic-prun


http://pynash.org/2013/03/06/timing-and-profiling/
%time, %timeit
%prun, %lprun
%mprun, %memit


> > #30113 - Allow helper functions to wrap sys.setprofile
> > #18971 - Use argparse in the profile/cProfile modules
> > #30118 - Add unittest for cProfile/profile command line interface
> >
> > It can divide into two categories, first is the context manager problem,
> and
> > the second is optparse to argparse problem.
> >
> > 1. context manager problem:
> >
> > Relative issue: #9285, #30113
> > Relative PR: #287, #1212, #1253
> >
> > This is an issue since 2010, and stop at profile can't simply add a
> > __enter__ and __exit__ to make it a context manager. The main problem is,
> > sys.setprofile() will hit the return and get bad return in profile
> > dispatch_return function. The solution is to insert a simulate call in
> the
> > helper function, to provide the context between helper frame and where
> the
> > profile is defined.
>
> I'd like to second Louie's call for additional review here. I've been
> reviewing them so far, and they look sensible to me, but I don't
> personally know the profile code base at all,

so there's a strong
> chance I'll miss subtle details.
>

https://westurner.github.io/wiki/awesome-python-testing#benchmarks
- plop,



https://github.com/python/cpython/blob/master/Lib/profile.py
https://github.com/python/cpython/blob/master/Lib/cProfile.py
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