今天遇到的问题是octane的跑分抖动很大。
lock了 CPU/EMC 的freq和core之后，还是有很大差异，不知道是为何。
octane的总分计算是subtest求几何平均值得到total score，并没有权重，所以应该是整体出了问题
但是这时候CPU并没有喂饱，是CPU schedule出问题？I/O，java GC？
// Runs all registered benchmark suites and optionally yields between
// each individual benchmark to avoid running for too long in the
// context of browsers. Once done, the final score is reported to the
// runner.
BenchmarkSuite.RunSuites = function(runner, skipBenchmarks) {
skipBenchmarks = typeof skipBenchmarks === 'undefined' ? [] : skipBenchmarks;
var continuation = null;
var suites = BenchmarkSuite.suites;
var length = suites.length;
BenchmarkSuite.scores = [];
var index = 0;
function RunStep() {
while (continuation || index < length) {
if (continuation) {
continuation = continuation();
} else {
var suite = suites[index++];
if (runner.NotifyStart) runner.NotifyStart(suite.name);
if (skipBenchmarks.indexOf(suite.name) > -1) {
suite.NotifySkipped(runner);
} else {
continuation = suite.RunStep(runner);
}
}
if (continuation && typeof window != 'undefined' && window.setTimeout) {
window.setTimeout(RunStep, 25);
return;
}
}
// show final result
if (runner.NotifyScore) {
var score = BenchmarkSuite.GeometricMean(BenchmarkSuite.scores);
var formatted = BenchmarkSuite.FormatScore(100 * score);
runner.NotifyScore(formatted);
}
}
RunStep();
}[1]数学平均值：http://science.scileaf.com/library/1392
[2]Octane: https://developers.google.com/octane/benchmark