Jump to content

vmstat Report Virtual Memory Statistics


Recommended Posts

NAME

vmstat - Report virtual memory statistics

SYNOPSIS

vmstat [-a] [-n] [delay [ count]]

vmstat [-f] [-s] [-m]

vmstat [-S unit]

vmstat [-d]

vmstat [-p disk partition]

vmstat [-V]

DESCRIPTION

vmstat reports information about processes, memory, paging, block IO,

traps, and cpu activity.

The first report produced gives averages since the last reboot. Addi-

tional reports give information on a sampling period of length delay.

The process and memory reports are instantaneous in either case.

Options

The -a switch displays active/inactive memory, given a 2.5.41 kernel or

better.

The -f switch displays the number of forks since boot. This includes

the fork, vfork, and clone system calls, and is equivalent to the total

number of tasks created. Each process is represented by one or more

tasks, depending on thread usage. This display does not repeat.

The -m displays slabinfo.

The -n switch causes the header to be displayed only once rather than

periodically.

The -s switch displays a table of various event counters and memory

statistics. This display does not repeat.

delay is the delay between updates in seconds. If no delay is speci-

fied, only one report is printed with the average values since boot.

count is the number of updates. If no count is specified and delay is

defined, count defaults to infinity.

The -d reports disk statistics (2.5.70 or above required)

The -p followed by some partition name for detailed statistics (2.5.70

or above required)

The -S followed by k or K or m or M switches outputs between 1000,

1024, 1000000, or 1048576 bytes

The -V switch results in displaying version information.

FIELD DESCRIPTION FOR VM MODE

Procs

r: The number of processes 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, 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

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 ;.

Fabian Frédérick ; (diskstat, slab, partitions...)

Link to post
Share on other sites
×
×
  • Create New...