Example on how to run multi-process node.js server

multiprocess-server.js

/**
 * This is sample to show multiprocess programming in node.js
 */

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

if (cluster.isMaster) {

  // Fork workers.
  for (let i = 0; i < numberOfCPUs; i++) {
    cluster.fork();
  }

  // Wait for workers to die, then display a message
  cluster.on('exit', (worker, code, signal) => {
    console.log(`worker ${worker.process.pid} died`);
  });

} else {

  // Workers can share any TCP connection
  // In this case it is an HTTP server
  const server = http.createServer((req, res) => {

    res.writeHead(200);
    res.end(`Hello world from worker #${cluster.worker.id}`);

  }).listen(8000, () => {

    console.log(`Worker #${cluster.worker.id} is listening on port 8000`);

  });

}