mirror of https://github.com/webpack/webpack.git
45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
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let result;
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const measure = (fn, count) => {
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const start = process.hrtime.bigint();
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for (let i = 0; i < count; i++) result = fn();
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return Number(process.hrtime.bigint() - start);
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};
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const NS_PER_MS = 1000000; // 1ms
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const MIN_DURATION = 100 * NS_PER_MS; // 100ms
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const MAX_DURATION = 1000 * NS_PER_MS; // 1000ms
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const MAX_WARMUP_DURATION = 1 * NS_PER_MS; // 1ms
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const format = (fast, slow, fastName, slowName, count) => {
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return `${fastName} is ${
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Math.round(((slow - fast) * 1000) / slow) / 10
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}% faster than ${slowName} (${Math.round(fast / 100 / count) / 10} µs vs ${
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Math.round(slow / 100 / count) / 10
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} µs, ${count}x)`;
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};
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const compare = (n1, f1, n2, f2) => {
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let count = 1;
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while (true) {
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const timings = [f1, f2, f1, f2, f1, f2].map(f => measure(f, count));
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const t1 = Math.min(timings[0], timings[2], timings[4]);
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const t2 = Math.min(timings[1], timings[3], timings[5]);
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if (count === 1 && (t1 > MAX_WARMUP_DURATION || t2 > MAX_WARMUP_DURATION)) {
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continue;
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}
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if (
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(t1 > MIN_DURATION && t2 > MIN_DURATION) ||
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t1 > MAX_DURATION ||
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t2 > MAX_DURATION
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) {
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return t1 > t2
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? format(t2, t1, n2, n1, count)
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: format(t1, t2, n1, n2, count);
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}
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count *= 2;
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}
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};
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module.exports = compare;
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