0x nodejs火焰图工具试用

├── README.md
├── ab.sh
├── app.js
├── package.json
└── yarn.lock

{
  "name": "nodejs-flame-graph",
  "version": "1.0.0",
  "main": "app.js",
  "license": "MIT",
  "scripts": {
    "start": "node --perf-basic-prof-only-functions app.js",
    "pprof": "node --prof app.js",
    "all-in-one":"0x app.js",
    "flame": "node --prof-process --preprocess -j isolate*.log | flamebearer"
  },
  "dependencies": {
    "express": "^4.14.1",
    "fast-levenshtein": "^2.0.6"
  },
  "devDependencies": {
    "0x": "^4.9.1",
    "flamebearer": "^1.1.3"
  }
}

//app.js
const express = require(‘express‘);
const console = require(‘console‘);
const levenshtein = require(‘fast-levenshtein‘);
var arr=[];
const HOW_OBVIOUS_THE_FLAME_GRAPH_SHOULD_BE_ON_SCALE_1_TO_100 = 10;
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const someFakeModule = (function someFakeModule () {
return {
  calculateStringDistance (a, b) {
    return levenshtein.get(a, b, {
    useCollator: true
    })
  }
 }
})()
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const app = express();
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app.get(‘/‘, (req, res) => {
  res.send(`
  <h2>Take a look at the network tab in devtools</h2>
  <script>
    function loops(func) {
    return func().then(_ => setTimeout(loops, 20, func))
    }
    loops(_ => fetch(‘api/tick‘))
  </script>\
  `)
});
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app.get(‘/api/tick‘, (req, res) => {
  arr.push({name:‘Shubham‘});
  Promise.resolve(‘asynchronous flow will make our stacktrace more realistic‘.repeat(HOW_OBVIOUS_THE_FLAME_GRAPH_SHOULD_BE_ON_SCALE_1_TO_100))
  .then(text => {
    const randomText =Math.random().toString(32).repeat(HOW_OBVIOUS_THE_FLAME_GRAPH_SHOULD_BE_ON_SCALE_1_TO_100)
    return someFakeModule.calculateStringDistance(text, randomText)
  })
  .then(result => res.end(`result: ${result}, ${arr.length}`))
});
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app.get(‘/api/end‘, () => process.exit());
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app.listen(8080, () => {
  console.log(`go to http://localhost:8080/ to generate traffic`)
});

#!/bin/sh
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ab -n 2000 -c 100 http://localhost:8080/api/tick

yarn 
yarn all-in-one