A Beginner's Guide to Ractors in Ruby - Honeybadger Developer Blog

If you are new to Ruby, you probably clicked on this article because you may have wondered, "what is a ractor?" We will go into the details of that soon, but, basically, ractors are a new feature that were included with Ruby v3.0 and enable true parallelism within the language. Now, your next question might be, "what is parallelism?" Before we get into the nitty gritty of ractors, let's back up a bit and define a few key terms.One of the criticisms that you might have heard about Ruby is that it is difficult to scale compared to other languages like Golang, Elixir, and Scala. Why is this? Well, it comes down to two terms that you’ve probably have heard of but may not completely understand: concurrency and parallelism.