Node.js: Run your code on multiple CPU cores

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By default, Node.js uses a single core and one thread. To take advantage of all available CPU cores, you might want to use the Node.js cluster API. You can find the official documentation here: https://nodejs.org/api/cluster.html.

Here is a simple example that creates an HTTP server using all available CPUs:

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

if (cluster.isMaster) {
  console.log(`Master ${process.pid} is running`);

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

  cluster.on('exit', (worker, code, signal) => {
    console.log(`Worker ${worker.process.pid} died`);
  });
} else {
  // Workers share any TCP connection, in this case, an HTTP server
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('hello world\n');
  }).listen(8000);

  console.log(`Worker ${process.pid} started`);
}