Redis执行一条命令有四个过程：发送命令、命令排队、命令执行、返回结果，整个过程是一个往返时间(RTT)。
一、概念
Redis4.0版本终于加入了模块module，用户可以自己根据需求扩展Redis相关的功能(实现新的Redis命令、数据结构等)，基于C99标准，即使用C/C++或者其它语言的C绑定接口均可实现。它分为系统模块和用户自定义模块，即你可根据自己的需求实现，然后加载进来即可使用。自定义模块如果有没有捕获或内存泄露出错等问题Redis本身是无法处理的，会导致程序整个挂掉，甚至很可能连日志都没有需要非常小心。
二、使用
启动方式
- 通过配置文件方式
- 加入
loadmodule /usr/local/your_path/redis-module-panda/panda.so - 启动
./redis-server 6379.conf
- 加入
- 通过命令方式
- 客户端启动后：
127.0.0.1:6379>module load /usr/local/your_path/redis-module-panda/panda.so - 服务端启动时：
./redis-server 6379.conf --loadmodule ./modules/redis-module-panda/panda.so
- 客户端启动后：
- 通过配置文件方式
panda例子
git clone https://github.com/wujunze/redis-module-panda.git，假设目录/usr/local/redis-module-pandacd /usr/local/redis-module-pandamake- 启动，假设按配置文件方式
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49127.0.0.1:6379> module list
1) 1) "name"
2) "panda"
3) "ver"
4) (integer) 1
127.0.0.1:6379> panda.hello
_,add8ba,
,d888888888b,
d8888888888888b _,ad8ba,_
d888888888888888) ,d888888888b,
I8888888888888888 _________ ,8888888888888b
__________`Y88888888888888P"""""""""""baaa,__ ,888888888888888,
,adP"""""""""""9888888888P""^ ^""Y8888888888888888I
,a8"^ ,d888P"888P^ ^"Y8888888888P'
,a8^ ,d8888' ^Y8888888P'
a88' ,d8888P' I88P"^
,d88' d88888P' "b,
,d88' d888888' `b,
,d88' d888888I `b,
d88I ,8888888' ___ `b,
,888' d8888888 ,d88888b, ____ `b,
d888 ,8888888I d88888888b, ,d8888b, `b
,8888 I8888888I d8888888888I ,88888888b 8,
I8888 88888888b d88888888888' 8888888888b 8I
d8886 888888888 Y888888888P' Y8888888888, ,8b
88888b I88888888b `Y8888888^ `Y888888888I d88,
Y88888b `888888888b, `""""^ `Y8888888P' d888I
`888888b 88888888888b, `Y8888P^ d88888
Y888888b ,8888888888888ba,_ _______ `""^ ,d888888
I8888888b, ,888888888888888888ba,_ d88888888b ,ad8888888I
`888888888b, I8888888888888888888888b, ^"Y888P"^ ____.,ad88888888888I
88888888888b,`888888888888888888888888b, "" ad888888888888888888888'
8888888888888698888888888888888888888888b_,ad88ba,_,d88888888888888888888888
88888888888888888888888888888888888888888b,`"""^ d8888888888888888888888888I
8888888888888888888888888888888888888888888baaad888888888888888888888888888'
Y8888888888888888888888888888888888888888888888888888888888888888888888888P
I888888888888888888888888888888888888888888888P^ ^Y8888888888888888888888'
`Y88888888888888888P88888888888888888888888888' ^88888888888888888888I
`Y8888888888888888 `8888888888888888888888888 8888888888888888888P'
`Y888888888888888 `888888888888888888888888, ,888888888888888888P'
`Y88888888888888b `88888888888888888888888I I888888888888888888'
"Y8888888888888b `8888888888888888888888I I88888888888888888'
"Y88888888888P `888888888888888888888b d8888888888888888'
^""""""""^ `Y88888888888888888888, 888888888888888P'
"8888888888888888888b, Y888888888888P^
`Y888888888888888888b `Y8888888P"^
"Y8888888888888888P `""""^
`"YY88888888888P'