How can I exploit multiple CPU/cores for Redis?

First Redis is single threaded but it’s not very frequent that CPU becomes your bottleneck with Redis, as usually Redis is either memory or network bound.

For instance, using pipelining Redis running on an average Linux system can deliver even 1 million requests per second, so if your application mainly uses O(N) or O(log n) commands, it is hardly going to use too much CPU.

However, to maximize CPU usage you can start multiple instances of Redis in the same box and treat them as different servers. At some point a single box may not be enough anyway, so if you want to use multiple CPUs you can start thinking of some way to shard earlier.

With Redis 4.0 Redis team started to make Redis more threaded. For now this is limited to deleting objects in the background, and to blocking commands implemented via Redis modules. For future releases, the plan is to make Redis more and more threaded.