性能测量 API

¥Performance measurement APIs

源代码: lib/perf_hooks.js

该模块提供了 W3C 网络性能 API 子集的实现以及用于 Node.js 特定性能测量的其他 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 网络性能 API：

¥Node.js supports the following Web Performance APIs:

• 高解析时间

  ¥High Resolution Time

• 性能时间轴

  ¥Performance Timeline

• 用户计时

  ¥User Timing

• 资源时序

  ¥Resource Timing

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