On Fri, Aug 01, 2014 at 10:03:30AM +0800, Aaron Lu wrote: > > > > ebe06187bf2aec1 a43455a1d572daf7b730fe12e > > > > --------------- ------------------------- > > > > 94500 ~ 3% +115.6% 203711 ~ 6% > > > > ivb42/hackbench/50%-threads-pipe > > > > 67745 ~ 4% +64.1% 111174 ~ 5% > > > > lkp-snb01/hackbench/50%-threads-socket > > > > 162245 ~ 3% +94.1% 314885 ~ 6% TOTAL > > > > proc-vmstat.numa_hint_faults_local
> 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 order' ~ 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.
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