vmstat输出项

# vmstat 1 
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 1  0    252 1566792 310940 5117772    0    0     2   101    1   11  2  0 97  0
 0  0    252 1566784 310940 5117776    0    0     0     0 4836 10015  1  0 100  0
 0  0    252 1566784 310940 5117776    0    0     0     0 4880 10070  0  0 100  0
 0  0    252 1566784 310940 5117776    0    0     0     0 4952 10137  0  0 100  0
 1  0    252 1566784 310940 5117776    0    0     0    36 5056 10222  0  0 100  0
 0  0    252 1566784 310940 5117776    0    0     0     0 4996 10220  0  0 100  0
 0  0    252 1566784 310940 5117776    0    0     0     0 5128 10443  0  1 99  0
 0  0    252 1566784 310940 5117776    0    0     0     0 5150 10368  0  0 100  0
 0  0    252 1566784 310940 5117776    0    0     0     0 5132 10423  0  1 100  0
 0  0    252 1566784 310940 5117776    0    0     0     0 5127 10380  0  0 100  0
 0  0    252 1566784 310940 5117776    0    0     0     4 5212 10485  0  0 100  0
 1  0    252 1566784 310940 5117776    0    0     0    16 5270 10530  0  0 99  1
 1  0    252 1566784 310940 5117780    0    0     0     0 5329 10615  0  0 100  0
 1  0    252 1566784 310940 5117800    0    0     0     0 4998 10316  1  0 99  0
 1  0    252 1566784 310940 5117800    0    0     0     0 5013 10213  0  0 100  0

man vmstat:

FIELD DESCRIPTION FOR VM MODE
   Procs
       r: The number of processes waiting for run time.(运行进程数）
       b: The number of processes in uninterruptible sleep.（阻塞进程数）

   Memory
       swpd: the amount of virtual memory used.
       free: the amount of idle memory.
       buff: the amount of memory used as buffers.（用于写操作的虚拟内存）
       cache: the amount of memory used as cache.  （用于读操作的虚拟内存）
       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).（从磁盘换入内存的大小）
       so: Amount of memory swapped to disk (/s).（从内存换入磁盘的大小）

   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)（用户占用CPU)
       sy: Time spent running kernel code. (system time)(系统占用CPU）
       id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time.（空闲CPU）
       wa: Time spent waiting for IO. Prior to Linux 2.5.41, included in idle. （等待I/O所花的时间）
       st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.

FIELD DESCRIPTION FOR DISK MODE
   Reads
       total: Total reads completed successfully
       merged: grouped reads (resulting in one I/O)
       sectors: Sectors read successfully
       ms: milliseconds spent reading

   Writes
       total: Total writes completed successfully
       merged: grouped writes (resulting in one I/O)
       sectors: Sectors written successfully
       ms: milliseconds spent writing

   IO
       cur: I/O in progress
       s: seconds spent for I/O

FIELD DESCRIPTION FOR DISK PARTITION MODE
       reads: Total number of reads issued to this partition
       read sectors: Total read sectors for partition
       writes : Total number of writes issued to this partition
       requested writes: Total number of write requests made for partition

FIELD DESCRIPTION FOR SLAB MODE
       cache: Cache name
       num: Number of currently active objects
       total: Total number of available objects
       size: Size of each object
       pages: Number of pages with at least one active object

NOTES
       vmstat does not require special permissions.

       These reports are intended to help identify system bottlenecks.  Linux vmstat does not count itself as a running process.

       All linux blocks are currently 1024 bytes. Old kernels may report blocks as 512 bytes, 2048 bytes, or 4096 bytes.

       Since procps 3.1.9, vmstat lets you choose units (k, K, m, M) default is K (1024 bytes) in the default mode

       vmstat uses slabinfo 1.1    FIXME

FILES
       /proc/meminfo
       /proc/stat
       /proc/*/stat

SEE ALSO
       iostat(1), sar(1), mpstat(1), ps(1), top(1), free(1)

BUGS
       Does not tabulate the block io per device or count the number of system calls.

AUTHORS
       Written by Henry Ware <al172@yfn.ysu.edu>.
       Fabian Frederick <ffrederick@users.sourceforge.net> (diskstat, slab, partitions...)

Throatwobbler Ginkgo Labs