Eric Lemoine-2-2 wrote:
>
> Hi
>
> To follow ...
> ...
> Chrome 7
> Old-style class: ~40ms (very unstable, from 26ms to 80ms)
> New-style class: ~30ms (very unstable)
> Inherit: ~30ms (very unstable)
> ...
>
> Thanks,
>
> --
> Eric Lemoine
>
> Camptocamp France SAS
> Savoie Technolac, BP 352
> 73377 Le Bourget du Lac, Cedex
>
> Tel : 00 33 4 79 44 44 96
> Mail : eric.lemo...@camptocamp.com
> http://www.camptocamp.com
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>
Hi Eric Lemoine,
For other reasons I am also testing the performance of the initialization.
To stabilize a little the sample, I remove the extraneous peaks with this
code:
function showAvg(testName,times) {
function staValues(t) {
var s = 0, v=0;
for(var i=0, l=t.length; i<l; i++) {
s += t[i];
v += t[i]*t[i];
}
var ev ={};
ev.avg = (s/l);
// Normalized standard deviation
ev.nsd = Math.sqrt((v/l)-(ev.avg*ev.avg))/ev.avg;
ev.l = l;
return ev;
}
var t = times.slice(0);
t = t.sort(function (a,b){return a - b;}); // sort ascending
var ev;
while (true) {
ev = staValues(t);
if (ev.avg == 0 || // break if all values are 0
ev.nsd <= 0.5 || // clean up of the normalized
standard deviation is less than 0.5
ev.l <= times.length * 2/3 // remove 1/3 of the sample
maximum.
) {
break;
}
console.log(testName+";", ev.avg.toFixed(1), "; max;",
t[ev.l-1], "; nsd;", ev.nsd.toFixed(3), "; sample;", ev.l); // to monitor
cleaning
t.pop(); // remove the anomalous peak produced by the
garbage collect or other
t.shift(); // remove the minimum to balance the sample
}
console.log(testName+":", ev.avg.toFixed(1));
}
used by:
showAvg("Old-style class",timesArray);
Xavier
--
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