Vmstat memory consumption query

-a： Show active and inactive memory

-f： Show the... Since the system was started fork Number  .

-m： Show slabinfo

-n： Display field names only once at the beginning .

-s： Display memory related statistics and the number of various system activities .

delay： Refresh interval . If you don't specify , Show only one result .

count： Refresh times . If you do not specify the number of refreshes , But the refresh interval is specified , At this time, the number of refreshes is infinite .

-d： Display disk related statistics .

-p： Display statistics for the specified partition

-S： Use the specified unit to display . Parameters have  k 、K 、m 、M , Represent the 1000、1024、1000000、1048576 byte （byte）. The default unit is K（1024 bytes）

-V： Show vmstat Version information .

[[email protected] ~]# vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 3  0   2048  77440      0 376040    0    8  3525   111  436 1100 13 16 71  1  0

procs （ process ）：

        r ： The number of tasks waiting to be performed

        B ： wait for IO The number of processes

Memory( Memory ) ：

        swpd ： Using virtual memory size , Company k

        free  ：  Free memory size

        buff ： Used buff size , Buffer the read and write of the block device

        cache ： Used cache size , File system cache

        inact ：  Inactive memory size , The memory marked recyclable , The difference in free and active  -a When

        active ：  Active memory size   -a When  

Swap（ Swap partition ）：

        si :  The amount of memory written from the swap per second （ Company ：kb/s）

        so :  The size of the swap written from memory per second  （ Company ：kb/s）

IO( disk IO performance ) ：

        bi ： Number of blocks read per second （ Read disk ）

        bo ： Number of blocks written per second （ Write disk ）

system（ kernel ）：

        in： Interrupts per second , Including clock interruption

        cs ： Number of context switches per second

CPU（ Expressed as a percentage ）：

        Us： User process execution consumption cpu Time (user time)

        Sy： System process consumption cpu Time (system time)

        Id： free time ( Include IO Waiting time )

        wa： wait for IO Time