memcached.h中规定key的长度要小于250byte
slab（value）的长度限制默认是1M，可以使用-I选项更改此限制
-I Override the size of each slab page. Adjusts max item size
(default: 1mb, min: 1k, max: 128m)
要增加的话，启动时添加-I 10m参数就可以,会有一个警告：
WARNING: Setting item max size above 1MB is not recommended! Raising this limit increases the minimum memory requirements and will decrease your memory efficiency.
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