On Fri, Aug 01, 2014 at 09:29:11AM +0200, Peter Zijlstra wrote: > 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.
Or, maybe you can use σ (lower case sigma) to indicate stddev, :) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
