tree 4b371291a051c5f3c4e6ce0c162b0917607e64df
parent 67b77da3c08f529e062ae1bfbb84a90fa36877f0
author Roman Lebedev <lebedev.ri@gmail.com> 1630679816 +0300
committer GitHub <noreply@github.com> 1630679816 +0100
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Statistics: add support for percentage unit in addition to time (#1219)

* Statistics: add support for percentage unit in addition to time

I think, `stddev` statistic is useful, but confusing.

What does it mean if `stddev` of `1ms` is reported?
Is that good or bad? If the `median` is `1s`,
then that means that the measurements are pretty noise-less.

And what about `stddev` of `100ms` is reported?
If the `median` is `1s` - awful, if the `median` is `10s` - good.

And hurray, there is just the statistic that we need:
https://en.wikipedia.org/wiki/Coefficient_of_variation

But, naturally, that produces a value in percents,
but the statistics are currently hardcoded to produce time.

So this refactors thinkgs a bit, and allows a percentage unit for statistics.

I'm not sure whether or not `benchmark` would be okay
with adding this `RSD` statistic by default,
but regales, that is a separate patch.

Refs. https://github.com/google/benchmark/issues/1146

* Address review notes