vmstat reports information about processes, memory, paging, block IO, traps, disks and cpu activity.
vmstat procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 2 0 9496 1632720 1179760 4628968 0 0 9 37 55 12 3 1 96 0 0
输出一大串数据，这一串数据是 vmstat 从开机到运行命令之间记录的平均数据。
vmstat [delay] [count]
第一行会打印平均值，之后每隔 [delay] 的时间，打印一次报告，在打印 [count] 次之后停止。
Procs r: The number of runnable processes (running or 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. cache: the amount of memory used as cache. inact: the amount of inactive memory. (-a option) active: the amount of active memory. (-a option) 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. cs: The number of context switches per second. CPU These are percentages of total CPU time. us: Time spent running non-kernel code. (user time, including nice time) sy: Time spent running kernel code. (system time) id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time. wa: Time spent waiting for IO. Prior to Linux 2.5.41, included in idle. st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.