Pro Express.js

CHAPTER 13

Multithreading with Clusters

There are a lot of detractors out there arguing against the use of Node.js, many of whose arguments are rooted in the myth that Node.js-based systems have to be single-threaded. Nothing could be further from the truth—and with the cluster module, we can effortlessly fork a Node.js process to create multiple processes. Yes, each process will still be single-threaded and be blocked by inapt synchronous code or some laborious processes (such as hashing of passwords). However, the whole system, now consisting of a few processes, won’t be blocked.

In the case of web apps, the processes can listen on the same ...