[issue13481] Use an accurate clock in timeit

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> With CLOCK_PROCESS_CPUTIME_ID:
> - depending on the platform, we'll measure either wall-clock time or
> CPU time

Indeed. I thought CPU time would be more useful (and that's the point of
the patch) but perhaps it breaks the spec.

> - preemtion, blocking syscalls, etc won't be accounted for (so, for
> example, I/O-related tests will be meaningless)

But does it include kernel CPU time for the given process?

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