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bench: use std::chrono rather than gettimeofday #11562

Merged
merged 2 commits into from Nov 8, 2017
Merged

bench: use std::chrono rather than gettimeofday #11562

merged 2 commits into from Nov 8, 2017

Commits on Nov 7, 2017

  1. bench: switch to std::chrono for time measurements 

    std::chrono removes portability issues.

Rather than storing doubles, store the untouched time_points. Then
convert to nanoseconds for display. This allows for maximum precision, while
keeping results comparable between differing hardware/operating systems.

Also, display full nanosecond counts rather than sub-second floats.
    @theuni
    theuni committed Nov 7, 2017
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  2. bench: prefer a steady clock if the resolution is no worse

    @theuni
    theuni committed Nov 7, 2017
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