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Help us understand the problem. What is going on with this article?

メソッドごとにパフォーマンスを計測したい

More than 5 years have passed since last update.

思ったよりも簡単です。やり方はFunction.prototype.applyを使ってあるメソッドの実行をhookするだけです。

js
function calcPerf (tag, tgt, func, args) {
    tgt = tgt || this;
    args = args || [];
    var n = performance.now();
    func.apply(tgt, args);
    var t = performance.now() - n;
    if ( t > 16 ) {
        // over 60fps
        console.warn(tag+": takes "+t+" ms!";
    }
}

js
calcPerf("drawSome", that, that.prototype.drawSome, [flag]);

こうすることで16ms以上かかったメソッドの実行を検出することができます。問題は実行するfuncの中のどの部分がheavyなのかは分かないという点ですが。

keroxp
iOS/Android/Unity/Node.js/Rails/Go/フロントエンド/SRE プログラマ
http://scrapbox.io/keroxp
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