NodeJs — Clustering in Node.js

Node.js runs on a single thread by default, which can limit performance on multi-core systems. The 'cluster' module allows you to spawn multiple worker processes that share the same server port, improving scalability and performance.

const cluster = require('cluster');
const http = require('http');
const os = require('os');

if (cluster.isMaster) {
  const cpuCount = os.cpus().length;
  for (let i = 0; i < cpuCount; i++) {
    cluster.fork();
  }
  cluster.on('exit', () => {
    console.log('Worker exited, creating a new one...');
    cluster.fork();
  });
} else {
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('Hello from Clustered Server');
  }).listen(3000);
}