On Fri, Aug 01, 2014 at 10:03:30AM +0800, Aaron Lu wrote:
> > > > ebe06187bf2aec1 a43455a1d572daf7b730fe12e
> > > > --------------- -------------------------
> > > > 94500 ~ 3% +115.6% 203711 ~ 6%
> > > > 67745 ~ 4% +64.1% 111174 ~ 5%
> > > > 162245 ~ 3% +94.1% 314885 ~ 6% TOTAL
> It means, for commit ebe06187bf2aec1, the number for
> num_hint_local_faults is 94500 for ivb42 machine and 67745 for lkp-snb01
> machine. The 3%, 4% following that number means the deviation of the
> different runs to their average(we usually run it multiple times to
> phase out possible sharp values). We should probably remove that
> percentage, as they cause confusion if no detailed explanation and may
> not mean much to the commit author and others(if the deviation is big
> enough, we should simply drop that result).
Nah, variance is good, but the typical symbol would be +- or the fancy
~ when used as a unary op means 'approx' or 'about' or 'same
~ when used as a binary op means equivalence, a weaker equal, often in
the vein of the unary op meaning.
Also see: http://en.wikipedia.org/wiki/Tilde#Mathematics
So while I think having a measure of variance is good, I think you
picked entirely the wrong symbol.
Good point! We'll first try ± for the stddev percent and fall back to
+- if it turn out to not work well in some cases.