Change Details

* 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. * bench: prefer a steady clock if the resolution is no worse This is a backport of core PR11562

* 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. * bench: prefer a steady clock if the resolution is no worse * Require a steady clock for bench with at least micro precision This is a backport of core PR11562 and PR11646

* 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. * bench: prefer a steady clock if the resolution is no worse * Require a steady clock for bench with at least micro precision This is a backport of core PR11562 and PR11646