Kevin Grittner <kgrittn@gmail.com> writes:
> There were 75 samples each of "disabled" and "reverted" in the
> spreadsheet. Averaging them all, I see this:
> reverted: 290,660 TPS
> disabled: 292,014 TPS
> That's a 0.46% overall increase in performance with the patch,
> disabled, compared to reverting it. I'm surprised that you
> consider that to be a "clearly measurable difference". I mean, it
> was measured and it is a difference, but it seems to be well within
> the noise. Even though it is based on 150 samples, I'm not sure we
> should consider it statistically significant.
You don't have to guess about that --- compare it to the standard
deviation within each group.
regards, tom lane