Performance comparison - nodejs+clister

app.js

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

if (cluster.isMaster) {
   // Spawn as many workers as there are CPUs in the system.
   for (var i = 0, n = os.cpus().length; i < n; i += 1) {
      cluster.fork({ SERVER_INDEX: i });
   }
} else {
    // Start the application
   app();
}

function app() {
   http.createServer(function(req, res) {
       res.end('SERVER-' + process.env.SERVER_INDEX);
   }).listen(8080);
}