Node 如何做性能分析

const v8Profiler = require('v8-profiler');
const title = 'test';
v8Profiler.startProfiling(title, true);
setTimeout(() => {
    const profiler = v8Profiler.stopProfiling(title);
    profiler.delete();
    console.log(profiler);
}, 5000);

const App = require('..');
const fs = require('fs');

function run() {
  let app = new App();
  app.bindAny('age', 18);
  app.use(($age, $ctx, $next) => {
    console.log('app middleware1');
    console.log('age' + $age);
    $next();
  });
  app.use(($ctx, $age, $next, $address) => {
    console.log('app middleware2');
    console.log('age' + $age);
    console.log('address', $address);
    $next();
  });
  app.get('/users/:name', ($age, $ctx, $next, $address) => {
    console.log('users/name middleware1');
    console.log($ctx.params.name);
    console.log('age' + $age);
    console.log('address', $address);
    $ctx.params.id = 'user1';
    $next();
  }, async ($age, $ctx, $next, $address) => {
    console.log('users/name middleware2');
    console.log($ctx.params.name, $ctx.params.id);
    console.log('age' + $age);
    console.log('address', $address);
    await read();
    $ctx.body = 'hello, ' + $ctx.path;
  });
  app.get('/users/', ($age, $ctx, $next, $address) => {
    console.log('users middleware1');
    console.log('age' + $age);
    console.log('address', $address);
    $ctx.params.id = 'user1';
    $next();
  }, ($age, $ctx, $next, $address) => {
    console.log('users middleware2');
    console.log($ctx.params.id);
    console.log('age' + $age);
    $ctx.body = 'hello, ' + $ctx.path;
  });
  app.use(($address, $ctx, $next, $age, $getAddress) => {
    console.log('app middleware3');
    console.log('age' + $age);
    console.log('address', $address);
    console.log('getAddress', $getAddress);
    $next();
  });
  app.bindAny('address', 'shanghai');
  app.bindFunction('getAddress', $address => {
    return $address;
  });
  app.listen(8080);
}

function read() {
  return new Promise((resolve, reject) => {
    fs.writeFile('test.log', `test`, {flag:'a',encoding:'utf-8',mode:'0666'},() => {
      resolve();
    })
  })
}
run();

[root@SGDLITVM0905 ~]# ab -n 10000 -c 100 http://10.5.41.247:8080/users/pooky
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 10.5.41.247 (be patient)
Completed 1000 requests
Completed 2000 requests
Completed 3000 requests
Completed 4000 requests
Completed 5000 requests
Completed 6000 requests
Completed 7000 requests
Completed 8000 requests
Completed 9000 requests
Completed 10000 requests
Finished 10000 requests


Server Software:
Server Hostname:        10.5.41.247
Server Port:            8080

Document Path:          /users/pooky
Document Length:        9 bytes

Concurrency Level:      100
Time taken for tests:   16.801 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Non-2xx responses:      10000
Total transferred:      1510000 bytes
HTML transferred:       90000 bytes
Requests per second:    595.19 [#/sec] (mean)
Time per request:       168.014 [ms] (mean)
Time per request:       1.680 [ms] (mean, across all concurrent requests)
Transfer rate:          87.77 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    4   2.4      3      21
Processing:    38  163  54.3    151     465
Waiting:       10  135  45.4    125     373
Total:         39  167  55.0    154     474

Percentage of the requests served within a certain time (ms)
  50%    154
  66%    163
  75%    175
  80%    189
  90%    230
  95%    299
  98%    338
  99%    370
 100%    474 (longest request)