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Wed Feb 22 00:30:28 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-February/116737.html

On Tue, Feb 21, 2012 at 1:00 PM, Sümer Cip <sumerc at gmail.com> wrote:
> Is there a reason behind the fact that the Python profilers work with Wall
> time by default? There are OS-dependent ways to get the CPU time of a
> thread, and giving that choice to the user _somehow_ ( to use wall vs cpu
> time) might be a good feature?

The original reason was that the Unix wall clock was more accurate
than its CPU clock. If that's changed we should probably (perhaps in a
platform-dependent way) change the default to the most accurate clock
available.

-- 
--Guido van Rossum (python.org/~guido)

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[Python-Dev] CPU vs Wall time Profiling