测量异步操作的持续时间

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\Measuring the duration of async operations

以下示例使用异步钩子和性能 API 来测量超时操作的实际持续时间(包括执行回调所花费的时间量)。

\The following example uses the Async Hooks and Performance APIs to measure the actual duration of a Timeout operation (including the amount of time it took to execute the callback).

import { createHook } from 'node:async_hooks';
import { performance, PerformanceObserver } from 'node:perf_hooks';
const set = new Set();
const hook = createHook({
 init(id, type) {
 if (type === 'Timeout') {
 performance.mark(`Timeout-${id}-Init`);
 set.add(id);
 }
 },
 destroy(id) {
 if (set.has(id)) {
 set.delete(id);
 performance.mark(`Timeout-${id}-Destroy`);
 performance.measure(`Timeout-${id}`,
 `Timeout-${id}-Init`,
 `Timeout-${id}-Destroy`);
 }
 },
});
hook.enable();
const obs = new PerformanceObserver((list, observer) => {
 console.log(list.getEntries()[0]);
 performance.clearMarks();
 performance.clearMeasures();
 observer.disconnect();
});
obs.observe({ entryTypes: ['measure'], buffered: true });
setTimeout(() => {}, 1000);'use strict';
const async_hooks = require('node:async_hooks');
const {
 performance,
 PerformanceObserver,
} = require('node:perf_hooks');
const set = new Set();
const hook = async_hooks.createHook({
 init(id, type) {
 if (type === 'Timeout') {
 performance.mark(`Timeout-${id}-Init`);
 set.add(id);
 }
 },
 destroy(id) {
 if (set.has(id)) {
 set.delete(id);
 performance.mark(`Timeout-${id}-Destroy`);
 performance.measure(`Timeout-${id}`,
 `Timeout-${id}-Init`,
 `Timeout-${id}-Destroy`);
 }
 },
});
hook.enable();
const obs = new PerformanceObserver((list, observer) => {
 console.log(list.getEntries()[0]);
 performance.clearMarks();
 performance.clearMeasures();
 observer.disconnect();
});
obs.observe({ entryTypes: ['measure'] });
setTimeout(() => {}, 1000);