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function log(text) {
document.getElementById("log").innerHTML += text + "\n";
window.scrollTo(0, document.body.height);
}
function loadFile(path) {
var xhr = new XMLHttpRequest();
xhr.open("GET", path, false);
xhr.send(null);
return xhr.responseText;
}
var runCount = -1;
var runFunction = function() {};
var completedRuns = -1; // Discard the any runs < 0.
var times = [];
function computeAverage(values) {
var sum = 0;
for (var i = 0; i < values.length; i++)
sum += values[i];
return sum / values.length;
}
function computeMax(values) {
var max = values.length ? values[0] : 0;
for (var i = 1; i < values.length; i++) {
if (max < values[i])
max = values[i];
}
return max;
}
function computeMedian(values) {
values.sort(function(a, b) { return a - b; });
var len = values.length;
if (len % 2)
return values[(len-1)/2];
return (values[len/2-1] + values[len/2]) / 2;
}
function computeMin(values) {
var min = values.length ? values[0] : 0;
for (var i = 1; i < values.length; i++) {
if (min > values[i])
min = values[i];
}
return min;
}
function computeStdev(values) {
var average = computeAverage(values);
var sumOfSquaredDeviations = 0;
for (var i = 0; i < values.length; ++i) {
var deviation = values[i] - average;
sumOfSquaredDeviations += deviation * deviation;
}
return Math.sqrt(sumOfSquaredDeviations / values.length);
}
function logStatistics(times) {
log("");
log("avg " + computeAverage(times));
log("median " + computeMedian(times));
log("stdev " + computeStdev(times));
log("min " + computeMin(times));
log("max " + computeMax(times));
}
function run() {
var start = new Date();
for (var i = 0; i < 10; ++i)
window.runFunction();
var time = new Date() - start;
completedRuns++;
if (completedRuns <= 0) {
log("Ignoring warm-up run (" + time + ")");
} else {
times.push(time);
log(time);
}
if (completedRuns < window.runCount) {
window.setTimeout(run, 0);
} else {
logStatistics(times);
}
}
function start(runCount, runFunction) {
window.runCount = runCount;
window.runFunction = runFunction;
log("Running " + runCount + " times");
run();
}
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