Node.js Cluster Module

Scale across multi-core CPUs by spawning workers on a shared server port.

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A single instance of Node.js runs in a single thread. The cluster module allows you to easily create child processes that all share server ports, multiplying throughput across CPU cores.

Key Takeaways: Node.js Cluster Module

Mastering Node.js Cluster Module helps you write clean and reliable Node.js code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

Node.js Cluster Module Code Example

Node.js

const cluster = require("cluster");
const os = require("os");

if (cluster.isPrimary) {
  const numCPUs = os.cpus().length;
  console.log(`Master spinning up ${numCPUs} CPU worker processes.`);
  // for (let i = 0; i < numCPUs; i++) cluster.fork();
}

Output

Master spinning up 8 CPU worker processes.

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

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Node.js Cluster Module

💡 Key Takeaways: Node.js Cluster Module

Node.js Cluster Module Code Example

Key Takeaways: Node.js Cluster Module