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Snailclimb merged 1 commit into from
Dec 6, 2022
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Update redis-questions-01.md #1882

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12 changes: 8 additions & 4 deletions docs/database/redis/redis-questions-01.md
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Expand Up @@ -364,17 +364,21 @@ Redis 通过 **IO 多路复用程序** 来监听来自客户端的大量连接

虽然，Redis6.0 引入了多线程，但是 Redis 的多线程只是在网络数据的读写这类耗时操作上使用了，执行命令仍然是单线程顺序执行。因此，你也不需要担心线程安全问题。

Redis6.0 的多线程默认是禁用的，只使用主线程。如需开启需要修改 redis 配置文件 `redis.conf` ：
Redis6.0 的多线程默认是禁用的，只使用主线程。如需开启需要设置IO线程数 > 1，需要修改 redis 配置文件 `redis.conf` ：

```bash
io-threads-do-reads yes
io-threads 4 #设置1的话只会开启主线程，官网建议4核的机器建议设置为2或3个线程，8核的建议设置为6个线程
```
另外：
- io-threads的个数一旦设置，不能通过config动态设置
- 当设置ssl后，io-threads将不工作

开启多线程后，还需要设置线程数，否则是不生效的。同样需要修改 redis 配置文件 `redis.conf` :
开启多线程后，默认只会使用多线程进行IO写入writes，即发送数据给客户端，如果需要开启多线程IO读取reads，同样需要修改 redis 配置文件 `redis.conf` :

```bash
io-threads 4 #官网建议4核的机器建议设置为2或3个线程，8核的建议设置为6个线程
io-threads-do-reads yes
```
但是官网描述开启多线程读并不能有太大提升，因此一般情况下并不建议开启

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