Redis Virtual Memory: the story and the code

If you are reading this article probably you already know it: Redis is an in-memory DB. It's persistent, as it's disk backed, but disk is only used to persist, all the data is taken in the computer RAM. I think the last few months showed that this was not a bad design decision. Redis proved to be very fast in real-world scenarios where there is to scale an unhealthy amount of writes, and it is sup