Cluster Module và Multi-threading

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

if (cluster.isMaster) {
  for (let i = 0; i < numCPUs; i++) cluster.fork();
} else {
  http.createServer((req, res) => res.end('Hello')).listen(8000);
}