1: 新創(chuàng)建一個(gè)master.js，代碼如下：

  var cluster = require('cluster');
  var numCPUs = require('os').cpus().length;

  if(cluster.isMaster){
    console.log('[master] ' + "start master...");

    for(var i = 0; i < numCPUs; i++){
      cluster.fork();
    }

    cluster.on('listening', function(worker, address){
      console.log('[master] ' + 'listening: worker' + worker.id + ',pid:' +       worker.process.pid + ', Address:' + address.address + ":" + address.port);
    });
  }else if(cluster.isWorker){
    console.log('[worker] ' + "start worker ..." + cluster.worker.id);
    require('./app.js');
  }

通過(guò)上面的代碼 可以有多個(gè)線程同時(shí)開(kāi)啟 訪問(wèn)app.js，結(jié)果如圖：

屏幕快照 2016-12-19 下午9.52.00.png

2: 進(jìn)行壓力測(cè)試的工具 選用的是siege

• 安裝siege

  brew install siege
  

• 使用siege測(cè)試

  siege -c 100 -r 2 http://localhost:4000
  

• siege各部分參數(shù)簡(jiǎn)單說(shuō)明

  Transactions: 30000 hits //完成30000次處理
  Availability: 100.00 % //100.00 % 成功率
  Elapsed time: 68.59 secs //總共使用時(shí)間
  Data transferred: 817.76 MB //共數(shù)據(jù)傳輸 817.76 
  MBResponse time: 0.04 secs //響應(yīng)時(shí)間，顯示網(wǎng)絡(luò)連接的速度                     
  Transaction rate: 437.38 trans/sec //平均每秒完成 437.38 次處
  Throughput: 11.92 MB/sec //平均每秒傳送數(shù)據(jù)
  Concurrency: 17.53 //實(shí)際最高并發(fā)連接數(shù)
  Successful transactions: 30000 //成功處理次數(shù)
  Failed transactions: 0 //失敗處理次數(shù)
  Longest transaction: 3.12 //每次傳輸所花最長(zhǎng)時(shí)間
  Shortest transaction: 0.00 //每次傳輸所花最短時(shí)間