var cluster = require('cluster');
var http = require('http');
var numCPUs = require('os').cpus().length; // 获取CPU的个数
 
if (cluster.isMaster) {
  for (var i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
 
  cluster.on('exit', function(worker, code, signal) {
    console.log('worker ' + worker.process.pid + ' died');
  });
} else {
  http.createServer(function(req, res) {
    res.writeHead(200);
    res.end("hello world\n");
  }).listen(8000);
}

var cluster = require('cluster');
var numCPUs = require('os').cpus().length;
 
if (cluster.isMaster) {
  for (var i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
  // 其它代码
  
} else {
  require("./app.js");
}