Clustering your Node.js application

Node.js runs typically runs on a single thread, and doesn't take advantage of the multiple cores that might be available within a system. It can actually handle a pretty large volume of requests with a single process due to its event-driven, asynchronous architecture. However, apps that receive heavy traffic stand to benefit greatly from using all available system cores. Node.js ships with a core cluster module, which allows an application to run on more than one core and achieve greater concurrency so that it can handle more load.