What are some examples of clustering in Node.js?

What are some examples of clustering in Node.js?

Clustering in Node.js allows you to take advantage of multi-core systems. You can create multiple instances of your application to handle more requests. Would you like to see a code example?

Yes, please provide a code example.

Here's a simple example:

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

if (cluster.isMaster) {
  const numCPUs = require('os').cpus().length;
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
} else {
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('Hello World!');
  }).listen(8000);
}

This code forks a worker for each CPU core and listens on port 8000.

How does this improve performance?

By using clustering, you can handle multiple requests simultaneously, which improves the performance of your application, especially under heavy load.

Are there any downsides to using clustering?

Yes, clustering can increase memory usage since each worker has its own memory space. Additionally, managing state across workers can be more complex.