cluster example

fib.js

var cluster = require('cluster');

function fib (n) {
  if (n < 2) {
    return 1;
  }
  else {
    return fib(n-2) + fib(n-1);
  }
}

var i= 0;
var n= 35;
function srv (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain', 'Content-Length': '0'});
  fib(n);
  res.end();
}

if (cluster.isMaster) {
  var numCPUs = process.argv[3] || 1;
  for (var i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('death', function(worker) {
    console.log('worker ' + worker.pid + ' died');
  });
} else {
  var port= + process.argv[2] || 1234;
  require('http').createServer(srv).listen(port);
  console.log('Fibonacci server (NO THREADS) listening: ' + port);
}