Shulou(Shulou.com)06/01 Report--

Editor to share with you what are the characteristics of redis fast, I hope you can learn a lot after reading this article, let's discuss it together!

Redis is an in-memory database written by ANSI C, which has excellent performance, network support and persistence, and provides API in multiple languages. The commonly used types are String, List, Hash, Set and ZSet.

Why is redis so fast?

1. Based entirely on memory, most of the requests are purely memory operations, which is very fast. The data is stored in memory, and the advantage similar to HashMap,HashMap is that the time complexity of search and operation is O (1).

2. The data structure is simple and the data operation is simple. The data structure in Redis is specially designed.

3. Single thread avoids unnecessary context switching and competition conditions, and there is no CPU consumption caused by multi-process or multi-thread switching, there is no need to consider all kinds of locks, there is no lock release operation, and there is no performance consumption caused by possible deadlocks.

4. Using the multi-channel Istroke O multiplexing model, non-blocking IO

5. Different underlying models are used, and the underlying implementation between them and the application protocols for communication with clients are different. Redis directly builds its own VM mechanism, because the general system calls system functions, it will waste a certain amount of time to move and request.

The internal implementation adopts epoll and adopts a simple event framework implemented by epoll+ itself. Read, write, close, and connect in epoll are all converted into events, and then take advantage of the multiplexing feature of epoll to never waste any time on io.

After reading this article, I believe you have a certain understanding of the fast characteristics of redis, want to know more related knowledge, welcome to follow the industry information channel, thank you for reading!

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