Why is Redis so fast
1. In-memory Storage
Redis stores data in memory.
Memory access is much faster than disk I/O. Reading and writing data from/to memory can be completed in a very short time
Redis将数据存储在内存中 内存的访问速度要比磁盘快的多，读写内存数据只需要很短的时间
2. Efficient Data Structures
Redis has a variety of efficient data structures such as strings, hashes, lists, sets, and sorted sets. These data structures are implemented with highly optimized algorithms.
Redis有丰富的高效数据结构，如strings、hash表、list、set和zset；
3. Single-Threaded Read/Write
In Redis, the single-threaded model simplifies the code structure and reduces the overhead of context switching between threads. There is no need to deal with complex issues such as thread synchronization and locking. Each command can be executed quickly and sequentially.
在Redis中，单线程模型简化了代码结构，减少了线程间上下文切换的开销，无需处理线程同步、锁定等复杂问题，各个命令可以快速、顺序地执行。
4. Non-Blocking IO Multiplexing
Redis uses non-blocking I/O multiplexing mechanisms. This allows Redis to handle multiple client connections efficiently. Redis doesn't block waiting for the I/O operation to complete. Instead, it can continue to handle other requests or perform other tasks. When the I/O operation is ready, Redis will be notified and then process the relevant I/O event immediately.
Redis 使用非阻塞 I/O 多路复用机制。这使 Redis 能够高效地处理多个客户端连接。Redis 不会阻塞等待 I/O 操作完成。相反，它可以继续处理其他请求或执行其他任务 当 I/O 操作准备就绪时，Redis 将收到通知，然后立即处理相关的 I/O 事件。
