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Wed Feb 22 07:49:07 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-February/116744.html

>
> 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.
>
>
Currently it seems clock_gettime() APIs have nanosecond resolution and OTOH
gettimeofday() have microsecond. Other than that, clock_gettime() has a
significant advantage: it has per-process timer available which will
increase the accuracy of the timing information of the profiled
application.

--
Sumer Cip
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[Python-Dev] CPU vs Wall time Profiling