如何看懂vmstat的信息

action08

FIELD DESCRIPTION FOR VM MODE
   Procs
       r: The number of processes waiting for run time.
       b: The number of processes in uninterruptible sleep.

   Memory
       swpd: the amount of virtual memory used.
       free: the amount of idle memory.
       buff: the amount of memory used as buffers.//buff什么意思
       cache: the amount of memory used as cache.//cache什么意思，跟buff有什么区别
       inact: the amount of inactive memory. (-a option)//不懂
       active: the amount of active memory. (-a option)//不懂

   Swap
       si: Amount of memory swapped in from disk (/s).
       so: Amount of memory swapped to disk (/s).

   IO
       bi: Blocks received from a block device (blocks/s).
       bo: Blocks sent to a block device (blocks/s).

   System
       in: The number of interrupts per second, including the clock.
...

ulovko

http://blog.chinaunix.net/uid-25256412-id-91378.html

action08

　　buffer : 作为buffer cache的内存，是块设备的读写缓冲区

　　cache: 作为page cache的内存, 文件系统的cache

action08

@ulovko

还有两个呢？？{:3_200:}有么？？
       inact: the amount of inactive memory. (-a option)//不懂
       active: the amount of active memory. (-a option)//不懂

ulovko

active  使用中
inactive 目前没有被使用
内核会自己控制的 ^_^

zhangshengdong

回复 4# action08


           inact: the amount of inactive memory. (-a option)
       active: the amount of active memory. (-a option)

       英文很重要，你可以看看它的字面意思。vmstat -a.说明通过a选项可以打印出inact和active。然后inact意思是不活动的内存数量；active的意思是活动的内存数量。

action08

怎么才算是活动内存，不活动内存的说呀
active memory.在operate system代表什么意思啊？

@ulovko@zhangshengdong