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var cluster = require('cluster');
 
if (cluster.isWorker) {
 
  console.log('Worker ' + process.pid + ' has started.');
 
  // Send message to master process.
  process.send({msgFromWorker: 'This is from worker ' + process.pid + '.'})
 
  // Receive messages from the master process.
  process.on('message', function(msg) {
    console.log('Worker ' + process.pid + ' received message from master.', msg);
  });
 
}
 
 
if (cluster.isMaster) {
 
  console.log('Master ' + process.pid + ' has started.');
 
  // Fork workers.
  for (var i = 0; i < 2; i++) {
    var worker = cluster.fork();
 
    // 워커로부터 메세지가 수신되고,
    // 워커의 pid 를 알 수 있습니다.
    worker.on('message', function(msg) {
      console.log('Master ' + process.pid + ' received message from worker ' + this.pid + '.', msg);
    });
 
    // 워커에 메세지를 보낼 때, pid 를 지정하여 보낼 수는 없습니다.
    // broadcast 입니다.
    worker.send({msgFromMaster: 'This is from master ' + process.pid + ' to worker ' + worker.pid + '.'});
  }
 
  // Be notified when worker processes die.
  cluster.on('death', function(worker) {
    console.log('Worker ' + worker.pid + ' died.');
  });
 
}