Node.js cluster example

spawn-node-process.js

const cluster = require('cluster');

if (cluster.isMaster) {
  // Count the machine's CPUs
  let cpuCount = require('os').cpus().length;

  // Create a worker for each CPU
  for (var i = 0; i < cpuCount; i += 1) {
    startWorker();
  }
} else {
  startApp();
}

function startWorker() {
  cluster.fork();
}

function startApp() {
  const app = new App();

  app.listen(process.env.PORT, function () {
    console.log('App started.');
  });
}