Clustering NodeJS for Performance

NodeJS is single-threaded by default. If you're running an app on a server with more than 1 CPU, you could easily increase performance by clustering your app via workers.

It's really easy to get started:

const cluster = require('cluster');const http = require('http');const numCPUs = require('os').cpus().length;if (cluster.isMaster) {  console.log(`Master ${process.pid} is running`);  for (let i = 0; i < numCPUs; i++) {    cluster.fork();  }  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  http.createServer((req, res) => {    res.writeHead(200);    res.end('hello world\n');  }).listen(8000);  console.log(`Worker ${process.pid} started`);}

This is a simple example from the Nodejs Docs.

You can easily replace http.createServer with an express or hapi app as well!