Debug file

test.js

var cluster = require('cluster');
var http = require('http');

console.log(cluster.isMaster ? "master" : "worker" + " :: " + process.pid);

if (cluster.isMaster) {
  // Fork workers.
  cluster.setupMaster({workers: 1});

  cluster.on('fork', function (worker) {
    console.log('worker ' + worker.process.pid + ' fork');
  });
  
  cluster.on('death', function(worker) {
    console.log('worker ' + worker.process.pid + ' died | state: ' + worker.state + (worker.suicide ? " # it was suicide" : ""));
  });
  
  cluster.autoFork();
} else {
  // Worker processes have a http server.
  http.Server(function(req, res) {
    res.writeHead(200);
    res.end("hello world\n");
  }).listen(8000);
}