nodejs multithread

gistfile1.txt

const cluster = require('cluster');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  for (var i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
  cluster.on('exit', function(deadWorker, code, signal) {
    var worker = cluster.fork();
    const newPID = worker.process.pid;
    const oldPID = deadWorker.process.pid;
    console.log(`worker ${oldPID} exited.`);
    console.log(`worker ${newPID} spawned.`);
  });
} else {
  // your app go here
  console.log(2)
}