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94623a8429
This script isn't quite working, but it's valuable to checkpoint the work at this point. I'm coordinating with the chromeperf.appspot.com folks to get the server to accept the data. R=eseidel@chromium.org Review URL: https://codereview.chromium.org/702603005
90 lines
2.4 KiB
Plaintext
90 lines
2.4 KiB
Plaintext
<script>
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function PerfRunner(options) {
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this.unit_ = options.unit || "ms";
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this.iterationsRemaining_ = options.iterations || 10;
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this.results_ = [];
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this.setup_ = options.setup;
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this.logLines_ = [];
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}
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PerfRunner.prototype.log = function(line) {
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this.logLines_.push(line);
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};
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PerfRunner.prototype.recordResult = function(result) {
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this.results_.push(result);
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};
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PerfRunner.prototype.runAsync = function(test) {
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var self = this;
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window.setTimeout(function() {
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if (self.setup_) {
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var setup = self.setup_;
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setup();
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}
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var startTime = Date.now();
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test(function() {
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var endTime = Date.now();
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self.recordResult(endTime - startTime);
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if (--self.iterationsRemaining_ > 0)
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self.runAsync(test);
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else
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self.finish();
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});
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});
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};
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PerfRunner.prototype.computeStatistics = function() {
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var data = this.results_.slice();
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// Add values from the smallest to the largest to avoid the loss of significance
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data.sort(function(a, b) { return a - b; });
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var middle = Math.floor(data.length / 2);
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var stats = {
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min: data[0],
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max: data[data.length - 1],
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median: data.length % 2 ? data[middle] : (data[middle - 1] + data[middle]) / 2,
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};
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// Compute the mean and variance using Knuth's online algorithm (has good numerical stability).
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var squareSum = 0;
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stats.values = this.results_;
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stats.mean = 0;
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for (var i = 0; i < data.length; ++i) {
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var x = data[i];
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var delta = x - stats.mean;
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var sweep = i + 1.0;
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stats.mean += delta / sweep;
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squareSum += delta * (x - stats.mean);
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}
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stats.variance = data.length <= 1 ? 0 : squareSum / (data.length - 1);
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stats.stdev = Math.sqrt(stats.variance);
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stats.unit = this.unit_;
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return stats;
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};
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PerfRunner.prototype.logStatistics = function(title) {
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var stats = this.computeStatistics();
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this.log("");
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this.log(title);
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if (stats.values)
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this.log("values " + stats.values.join(", ") + " " + stats.unit);
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this.log("avg " + stats.mean + " " + stats.unit);
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this.log("median " + stats.median + " " + stats.unit);
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this.log("stdev " + stats.stdev + " " + stats.unit);
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this.log("min " + stats.min + " " + stats.unit);
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this.log("max " + stats.max + " " + stats.unit);
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};
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PerfRunner.prototype.finish = function () {
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this.logStatistics("Time:");
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internals.notifyTestComplete(this.logLines_.join('\n'));
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}
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module.exports = PerfRunner;
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</script>
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