> It was a bit random across the different suites.  CoreMark
> uses clock_gettime(CLOCK_REALTIME, ...) which is a wall clock
> with NTP adjustments.  EEMBC uses clock() which is a lower
> resolution wall clock.
So everything was mostly wall clock based. We had not tested 
CLOCK_PROCESS_CPUTIME_ID internally and people were happily surprised of 
functionality/accuracy of your results.
I assume this clock is just requiring a hrtimer + stats accumulation per 
process/thread in scheduler but I clearly prefer it to be there rather than 
post-processing a scheduler trace !

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