Node.js 8 the Right Way

Clustering Node.js Processes

In multithreaded systems, doing more work in parallel means spinning up more threads. But Node.js uses a single-threaded event loop, so to take advantage of multiple cores or multiple processors on the same computer, you have to spin up more Node.js processes.

This is called clustering and it’s what Node.js’s built-in cluster module does. Clustering is a useful technique for scaling up your Node.js application when there’s unused CPU capacity available.

To explore how the cluster module works, we’ll build up a program that manages a pool of worker processes to respond to ØMQ requests. This will be a drop-in replacement for our previous responder program. It will use ROUTER, DEALER, and REP sockets to distribute ...