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denoland-deno/tools/bench/rebench.js
Aaron O'Mullan b3ceafaa5d
tools(bench): rebootstrap (#12281)
Enable deno devs to bench/profile/test JS code changes without doing a full --release rebuild.

Incremental release builds take ~4mn on M1s, often more on other machines ...
2021-10-01 00:42:24 +02:00

25 lines
675 B
JavaScript

export function benchSync(name, n, innerLoop) {
const t1 = Date.now();
for (let i = 0; i < n; i++) {
innerLoop(i);
}
const t2 = Date.now();
console.log(benchStats(name, n, t1, t2));
}
export async function benchAsync(name, n, innerLoop) {
const t1 = Date.now();
for (let i = 0; i < n; i++) {
await innerLoop(i);
}
const t2 = Date.now();
console.log(benchStats(name, n, t1, t2));
}
function benchStats(name, n, t1, t2) {
const dt = (t2 - t1) / 1e3;
const r = n / dt;
const ns = Math.floor(dt / n * 1e9);
return `${name}:${" ".repeat(20 - name.length)}\t` +
`n = ${n}, dt = ${dt.toFixed(3)}s, r = ${r.toFixed(0)}/s, t = ${ns}ns/op`;
}