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NodeJs性能分析

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NodeJs性能分析

这里提出一种面向NodeJs的基于Chrome Dev Tools的性能分析方法。

核心思路

  • 基于console.profile记录性能描述信息，输出.cpuprofile文件。
  • 基于Inspector记录内存占用信息， 输出.heapsnapshot文件。
  • 基于Chrome读取.cpuprofile和.heapsnapshot文件分析性能问题。

效果

JS执行情况

image-20240111175431182

内存占用情况

image-20240111175943820

源码

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import * as inspector from "inspector"
import * as path from "path";
import * as fs from "fs"
export class Profile {
  label: string
  private profileFilePath: string
  private session: inspector.Session;
  private heapsnapshotFileId: number;
  private labelComplete: string;
  constructor(label: string) {
    this.label = label
    this.profileFilePath = path.resolve(__dirname, "../") + '/';
  }
  starGetCpuProfile() {
    console.profile(this.label + `-${this.labelComplete}`);
  }
  endGetCpuProfile() {
    console.profileEnd(this.label + `-${this.labelComplete}`);
  }
  startGetHeapsnapshot() {
    this.session = new inspector.Session();
    this.heapsnapshotFileId = fs.openSync(this.profileFilePath + this.label + `-${this.labelComplete}` + '.heapsnapshot', 'w');
    this.session.connect();
    this.session.on('HeapProfiler.addHeapSnapshotChunk', (m) => {
      fs.writeSync(this.heapsnapshotFileId, m.params.chunk);
    });
  }
  endGetHeapsnapshot() {
    this.session.post('HeapProfiler.takeHeapSnapshot', null, (err, r) => {
      this.session.disconnect();
      fs.closeSync(this.heapsnapshotFileId);
    });
  }
  start() {
    const now = new Date();
    this.labelComplete = `${now.getFullYear()}-${(now.getMonth() + 1).toString().padStart(2, '0')}-${now.getDate().toString().padStart(2, '0')}-${now.getHours().toString().padStart(2, '0')}-${now.getMinutes().toString().padStart(2, '0')}-${now.getSeconds().toString().padStart(2, '0')}`
    // fist start get heapsnapshot
    this.startGetHeapsnapshot();
    this.starGetCpuProfile();
  }
  end() {
    // fist end get cpu profile
    this.endGetCpuProfile();
    this.endGetHeapsnapshot();
  }
}

使用

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import { Profile } from "profile"
const getDependencyTreeProfile = new Profile('getDependencyTree');
// 开始记录性能信息
getDependencyTreeProfile.start()
let dependencyTreeData = undefined;
try {
  // 一些比较耗性能的工作 这里以获取文件的依赖关系为例
  dependencyTreeData = getDependencyTree(
    path.join(folderPath, mainFilePath),
    folderPath,
    {
      alias,
      resolveExtensions,
      onGotFileString,
      onGotAST,
      onGotCircularStructureNode,
    });
} catch (e) {
  // 性能信息记录结束
  getDependencyTreeProfile.end()
  return false;
}
// 性能信息记录结束
getDependencyTreeProfile.end()