vmstat

说明

输出列说明

类别	列名	说明
process	r	The number of processes waiting for a runtime
	b	The number of processes in uninterruptible sleep
memory	swpd	The amount of memory currently used in swap spaces
	free	The amount of idle (immediately available) memory
	buff	The amount of memory used as buffers
	cache	The amount of memory used as the cache
swap	si	Pages of memory swapped in per second
	so	Pages of memory swapped out per second
io	bi	Blocks per second received from block devices
	bo	Blocks per second sent to block devices
system	in	Interrupts raised per second
	cs	Context switches per second
cpu	us	Percentage of time spent running user-space code
	sy	Percentage of time spent running kernel-space Code
	id	Percentage of time spent idle
	wa	Percentage of time spent blocked while waiting for I/O to complete
	st	Percentage of time where the CPU had a process ready to run, but CPU time was stolen by the hypervisor supporting this virtual machine (typically because the CPU is being used by another guest virtual machine)

使用示例

vmstat 
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0    512 905100   1432 2426868    0    0     0     8    1   11  0  0 100  0  0
 
# 显示的是开机以来的平均数据

# 每隔1秒报告一次，共报告5次
vmstat 1 5
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0    512 904848   1432 2426908    0    0     0     8    1   11  0  0 100  0  0
 0  0    512 904848   1432 2426908    0    0     0     0  111  144  1  0 100  0  0
 0  0    512 904848   1432 2426908    0    0     0     0  122  164  0  0 100  0  0
 0  0    512 904848   1432 2426908    0    0     0     0  121  152  0  0 100  0  0
 0  0    512 904848   1432 2426908    0    0     0     0  111  164  0  0 100  0  0
 
 # 第一组数据为开机以来的平均数据

输出单位修改

输出结果中默认是以 KiB 为单位，-S 选项修改输出结果的单位为KB、MB、MiB，-S k | -S m | -S M

Switches outputs between 1000 (k), 1024 (K), 1000000 (m), or 1048576 (M) bytes

# KiB
vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0      0 826828   3844 681288    0    0     0     1    8   11  0  0 100  0  0

# KiB
vmstat -S K
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0      0 826828   3844 681288    0    0     0     1    8   11  0  0 100  0  0

# KB
vmstat -S k
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0      0 846671   3936 697638    0    0     0     1    8   11  0  0 100  0  0

# MB
vmstat -S m
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0      0    846      3    697    0    0     0     1    8   11  0  0 100  0  0

# MiB
vmstat -S M
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0      0    807      3    665    0    0     0     1    8   11  0  0 100  0  0

输出结果前两行是头信息，第三行是平均值，第四行开始是我们需要的信息

vmstat 2 5 -S M |& tail -n +4
 0  0      0    807      3    665    0    0     0     6  401  554  1  1 97  0  0
 0  0      0    807      3    665    0    0     0     0  113  185  0  0 100  0  0
 0  0      0    807      3    665    0    0     0     0  131  201  0  0 100  0  0
 0  0      0    807      3    665    0    0     0     0  124  196  0  0 100  0  0