mirror of
https://gitlab.com/procps-ng/procps.git
synced 2024-11-24 02:24:51 +08:00
48e4be926d
The r column can mean a waiting to run OR running process. This is cleared up in the man page now. Signed-off-by: Craig Small <csmall@enc.com.au>
222 lines
5.3 KiB
Groff
222 lines
5.3 KiB
Groff
.\" This page Copyright (C) 1994 Henry Ware <al172@yfn.ysu.edu>
|
|
.\" Distributed under the GPL, Copyleft 1994.
|
|
.TH VMSTAT 8 "September 2011" "procps-ng" "System Administration"
|
|
.SH NAME
|
|
vmstat \- Report virtual memory statistics
|
|
.SH SYNOPSIS
|
|
.B vmstat
|
|
[options]
|
|
.RI [ delay " [" count ]]
|
|
.SH DESCRIPTION
|
|
.B vmstat
|
|
reports information about processes, memory, paging, block IO, traps, disks
|
|
and cpu activity.
|
|
.PP
|
|
The first report produced gives averages since the last reboot. Additional
|
|
reports give information on a sampling period of length
|
|
.IR delay .
|
|
The process and memory reports are instantaneous in either case.
|
|
.SH OPTIONS
|
|
.TP
|
|
.I delay
|
|
The
|
|
.I delay
|
|
between updates in seconds. If no
|
|
.I delay
|
|
is specified, only one report is printed with the average values since boot.
|
|
.TP
|
|
.I count
|
|
Number of updates. In absence of
|
|
.IR count ,
|
|
when
|
|
.I delay
|
|
is defined, default is infinite.
|
|
.TP
|
|
\fB\-a\fR, \fB\-\-active\fR
|
|
Display active and inactive memory, given a 2.5.41 kernel or better.
|
|
.TP
|
|
\fB\-f\fR, \fB\-\-forks\fR
|
|
The
|
|
.B \-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.
|
|
.TP
|
|
\fB\-m\fR, \fB\-\-slabs\fR
|
|
Displays slabinfo.
|
|
.TP
|
|
\fB\-n\fR, \fB\-\-one-header\fR
|
|
Display the header only once rather than periodically.
|
|
.TP
|
|
\fB\-s\fR, \fB\-\-stats\fR
|
|
Displays a table of various event counters and memory statistics. This
|
|
display does not repeat.
|
|
.TP
|
|
\fB\-d\fR, \fB\-\-disk\fR
|
|
Report disk statistics (2.5.70 or above required).
|
|
.TP
|
|
\fB\-D\fR, \fB\-\-disk-sum\fR
|
|
Report some summary statistics about disk activity.
|
|
.TP
|
|
\fB\-p\fR, \fB\-\-partition\fR \fIdevice\fR
|
|
Detailed statistics about partition (2.5.70 or above required).
|
|
.TP
|
|
\fB\-S\fR, \fB\-\-unit\fR \fIcharacter\fR
|
|
Switches outputs between 1000
|
|
.RI ( k ),
|
|
1024
|
|
.RI ( K ),
|
|
1000000
|
|
.RI ( m ),
|
|
or 1048576
|
|
.RI ( M )
|
|
bytes. Note this does not change the swap (si/so) or block (bi/bo)
|
|
fields.
|
|
.TP
|
|
\fB\-V\fR, \fB\-\-version\fR
|
|
Display version information and exit.
|
|
.TP
|
|
\fB\-h\fR, \fB\-\-help\fR
|
|
Display help and exit.
|
|
.PD
|
|
.SH "FIELD DESCRIPTION FOR VM MODE"
|
|
.SS
|
|
.B "Procs"
|
|
.nf
|
|
r: The number of runnable processes (running or waiting for run time).
|
|
b: The number of processes in uninterruptible sleep.
|
|
.fi
|
|
.PP
|
|
.SS
|
|
.B "Memory"
|
|
.nf
|
|
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)
|
|
.fi
|
|
.PP
|
|
.SS
|
|
.B "Swap"
|
|
.nf
|
|
si: Amount of memory swapped in from disk (/s).
|
|
so: Amount of memory swapped to disk (/s).
|
|
.fi
|
|
.PP
|
|
.SS
|
|
.B "IO"
|
|
.nf
|
|
bi: Blocks received from a block device (blocks/s).
|
|
bo: Blocks sent to a block device (blocks/s).
|
|
.fi
|
|
.PP
|
|
.SS
|
|
.B "System"
|
|
.nf
|
|
in: The number of interrupts per second, including the clock.
|
|
cs: The number of context switches per second.
|
|
.fi
|
|
.PP
|
|
.SS
|
|
.B "CPU"
|
|
These are percentages of total CPU time.
|
|
.nf
|
|
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.
|
|
.fi
|
|
.PP
|
|
.SH "FIELD DESCRIPTION FOR DISK MODE"
|
|
.SS
|
|
.B "Reads"
|
|
.nf
|
|
total: Total reads completed successfully
|
|
merged: grouped reads (resulting in one I/O)
|
|
sectors: Sectors read successfully
|
|
ms: milliseconds spent reading
|
|
.fi
|
|
.PP
|
|
.SS
|
|
.B "Writes"
|
|
.nf
|
|
total: Total writes completed successfully
|
|
merged: grouped writes (resulting in one I/O)
|
|
sectors: Sectors written successfully
|
|
ms: milliseconds spent writing
|
|
.fi
|
|
.PP
|
|
.SS
|
|
.B "IO"
|
|
.nf
|
|
cur: I/O in progress
|
|
s: seconds spent for I/O
|
|
.fi
|
|
.PP
|
|
.SH "FIELD DESCRIPTION FOR DISK PARTITION MODE"
|
|
.nf
|
|
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
|
|
.fi
|
|
.PP
|
|
.SH "FIELD DESCRIPTION FOR SLAB MODE"
|
|
.nf
|
|
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
|
|
.fi
|
|
.SH NOTES
|
|
.B "vmstat "
|
|
does not require special permissions.
|
|
.PP
|
|
These reports are intended to help identify system bottlenecks. Linux
|
|
.B vmstat
|
|
does not count itself as a running process.
|
|
.PP
|
|
All linux blocks are currently 1024 bytes. Old kernels may report blocks as
|
|
512 bytes, 2048 bytes, or 4096 bytes.
|
|
.PP
|
|
Since procps 3.1.9, vmstat lets you choose units (k, K, m, M). Default is K
|
|
(1024 bytes) in the default mode.
|
|
.PP
|
|
vmstat uses slabinfo 1.1
|
|
.SH FILES
|
|
.ta
|
|
.nf
|
|
/proc/meminfo
|
|
/proc/stat
|
|
/proc/*/stat
|
|
.fi
|
|
.SH "SEE ALSO"
|
|
.BR free (1),
|
|
.BR iostat (1),
|
|
.BR mpstat (1),
|
|
.BR ps (1),
|
|
.BR sar (1),
|
|
.BR top (1)
|
|
.PP
|
|
.SH BUGS
|
|
Does not tabulate the block io per device or count the number of system calls.
|
|
.SH AUTHORS
|
|
Written by
|
|
.UR al172@yfn.\:ysu.\:edu
|
|
Henry Ware
|
|
.UE .
|
|
.br
|
|
.UR ffrederick@users.\:sourceforge.\:net
|
|
Fabian Fr\('ed\('erick
|
|
.UE
|
|
(diskstat, slab, partitions...)
|
|
.SH "REPORTING BUGS"
|
|
Please send bug reports to
|
|
.UR procps@freelists.org
|
|
.UE
|