CPU time option

[gsnedders]

For some uses, it would be nice to measure CPU time rather than wall-clock time.

[vstinner]

Hi. Which API do you want to specify which clock should be used? A parameter to Runner()? A parameter to bench*() functions? Both?

[gsnedders]

At an API level I think parameter to Runner? Having a single Runner having some wall-clock timed and some CPU timed seems like it would probably be confusing in terms of understanding what is being measured.

That said, I was mostly thinking about the CLI and imagining another option like --tracemalloc/--track-memory changing what is measured.