Because Redis operations are very fast - all its data is in memory, and there is no need to access the disk at all. As for concurrency, Redis uses multi-channel I/O multiplexing technology, and its own concurrency efficiency is not a problem.
Of course, a single Redis process cannot use multiple cores (it can only run on one CPU core at any time), but it is not a very computationally intensive service. If the single-core performance is not enough, you can open several more processes.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Because Redis operations are very fast - all its data is in memory, and there is no need to access the disk at all. As for concurrency, Redis uses multi-channel I/O multiplexing technology, and its own concurrency efficiency is not a problem.
Of course, a single Redis process cannot use multiple cores (it can only run on one CPU core at any time), but it is not a very computationally intensive service. If the single-core performance is not enough, you can open several more processes.
Search for: Redis single thread-multiplexed io model