性能测量 API

【Performance measurement APIs】

源代码: lib/perf_hooks.js

该模块提供了 W3C 网页性能接口 子集的实现，以及用于 Node.js 特定性能测量的额外 API。

【This module provides an implementation of a subset of the W3C Web Performance APIs as well as additional APIs for Node.js-specific performance measurements.】

Node.js 支持以下 网页性能接口：

【Node.js supports the following Web Performance APIs:】

• 高分辨率时间
• 性能时间表
• 用户时序
• 资源时序

import { performance, PerformanceObserver } from 'node:perf_hooks';

const obs = new PerformanceObserver((items) => {
  console.log(items.getEntries()[0].duration);
  performance.clearMarks();
});
obs.observe({ type: 'measure' });
performance.measure('Start to Now');

performance.mark('A');
doSomeLongRunningProcess(() => {
  performance.measure('A to Now', 'A');

  performance.mark('B');
  performance.measure('A to B', 'A', 'B');
});const { PerformanceObserver, performance } = require('node:perf_hooks');

const obs = new PerformanceObserver((items) => {
  console.log(items.getEntries()[0].duration);
});
obs.observe({ type: 'measure' });
performance.measure('Start to Now');

performance.mark('A');
(async function doSomeLongRunningProcess() {
  await new Promise((r) => setTimeout(r, 5000));
  performance.measure('A to Now', 'A');

  performance.mark('B');
  performance.measure('A to B', 'A', 'B');
})();拷贝