What are some examples of using the Node.js cluster module?

What are some examples of using the Node.js cluster module?

The Node.js cluster module allows you to create child processes that share the same server port. Would you like to see a code example?

Yes, please provide a simple code example.

Here's a basic example:

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();
  }
  cluster.on('exit', (worker, code, signal) => {
    console.log(`Worker ${worker.process.pid} died`);
  });
} else {
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('Hello World!');
  }).listen(8000);
}

This code creates a simple HTTP server that utilizes all available CPU cores.

How does this improve performance?

By forking multiple processes, the application can handle more requests simultaneously, improving performance on multi-core systems.

Are there any downsides to using the cluster module?

Yes, managing state between processes can be challenging, and debugging can be more complex due to multiple instances.