Unix系统vmstat命令详解

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, shown as zero.

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

totpages: Total number of allocated pages

pslab: Number of pages per slab

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