proposal: testing: calculate 'grain' in different way if specifying -benchtime=Nx #37996
Benchmarks running with 'RunParallel' calculates the 'grain' value based on the previous iteration number and previous duration, while the value might be fuzzy if -benchtime=Nx is specified since the auto adjustment phase is skipped and the previous iteration number is always 1, resulting in a much smaller 'grain' (most of time it's 1) than normal flow.
Propose to calculate 'grain' by "b.benchTime.n / numProcs" first if -benchtime=Nx is specified, then continue with the current rounding up.
New output with the above change:
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