chat_ws/start.js

#!/usr/bin/env node --harmony --trace_gc
var cluster = require('cluster');
var http = require('http');

if (cluster.isMaster) {
  var num = require('os').cpus().length;
  num = 4;
  for (var i = 0; i < num; i++) {
    cluster.fork();
  }

  cluster.on('exit', function(worker, code, signal) {
    console.error('worker ' + worker.process.pid + ' died');
    cluster.fork();
  });

  cluster.on('listening', function(worker, address) {
    console.log("A worker with #" + worker.id + " is now connected to "
        + address.address + ":" + address.port);
  });

} else {
  var app = require('./app.js');
  var port = process.env.PORT || '3000';
  app.set('port', port);
  var server = http.createServer(app);
  
  require('./ws.js');
  server.listen(port);
}