mirror of
https://gitlab.com/procps-ng/procps.git
synced 2024-11-24 02:24:51 +08:00
131 lines
3.4 KiB
Groff
131 lines
3.4 KiB
Groff
.\" -*-Nroff-*-
|
|
.\" This page Copyright (C) 1993 Matt Welsh, mdw@sunsite.unc.edu.
|
|
.\" Long options where added at April 15th, 2011.
|
|
.\" Freely distributable under the terms of the GPL
|
|
.TH FREE 1 "July 2014" "procps-ng" "User Commands"
|
|
.SH NAME
|
|
free \- Display amount of free and used memory in the system
|
|
.SH SYNOPSIS
|
|
.B free
|
|
.RI [ options ]
|
|
.SH DESCRIPTION
|
|
.B free
|
|
displays the total amount of free and used physical and swap memory in the
|
|
system, as well as the buffers and caches used by the kernel. The
|
|
information is gathered by parsing /proc/meminfo. The displayed
|
|
columns are:
|
|
.TP
|
|
\fBtotal\fR
|
|
Total installed memory (MemTotal and SwapTotal in /proc/meminfo)
|
|
.TP
|
|
\fBused\fR
|
|
Used memory (calculated as \fBtotal\fR - \fBfree\fR - \fBbuffers\fR - \fBcache\fR)
|
|
.TP
|
|
\fBfree\fR
|
|
Unused memory (MemFree and SwapFree in /proc/meminfo)
|
|
.TP
|
|
\fBshared\fR
|
|
Memory used (mostly) by tmpfs (Shmem in /proc/meminfo, available on
|
|
kernels 2.6.32, displayed as zero if not available)
|
|
.TP
|
|
\fBbuffers\fR
|
|
Memory used by kernel buffers (Buffers in /proc/meminfo)
|
|
.TP
|
|
\fBcache\fR
|
|
Memory used by the page cache and slabs (Cached and Slab in /proc/meminfo)
|
|
.TP
|
|
\fBbuff/cache\fR
|
|
Sum of \fBbuffers\fR and \fBcache\fR
|
|
.TP
|
|
\fBavailable\fR
|
|
Estimation of how much memory is available for starting
|
|
new applications, without swapping. Unlike the data
|
|
provided by the \fBcache\fR or \fBfree\fR fields,
|
|
this field takes into account page cache and also that
|
|
not all reclaimable memory slabs will be reclaimed
|
|
due to items being in use (MemAvailable in /proc/meminfo, available on
|
|
kernels 3.14, emulated on kernels 2.6.27+, otherwise the same as \fBfree\fR)
|
|
.SH OPTIONS
|
|
.TP
|
|
\fB\-b\fR, \fB\-\-bytes\fR
|
|
Display the amount of memory in bytes.
|
|
.TP
|
|
\fB\-k\fR, \fB\-\-kilo\fR
|
|
Display the amount of memory in kilobytes. This is the default.
|
|
.TP
|
|
\fB\-m\fR, \fB\-\-mega\fR
|
|
Display the amount of memory in megabytes.
|
|
.TP
|
|
\fB\-g\fR, \fB\-\-giga\fR
|
|
Display the amount of memory in gigabytes.
|
|
.TP
|
|
\fB\-\-tera\fR
|
|
Display the amount of memory in terabytes.
|
|
.TP
|
|
\fB\-h\fR, \fB\-\-human\fP
|
|
Show all output fields automatically scaled to shortest three digit unit and
|
|
display the units of print out. Following units are used.
|
|
.sp
|
|
.nf
|
|
B = bytes
|
|
K = kilos
|
|
M = megas
|
|
G = gigas
|
|
T = teras
|
|
.fi
|
|
.sp
|
|
If unit is missing, and you have petabyte of RAM or swap, the number is in
|
|
terabytes and columns might not be aligned with header.
|
|
.TP
|
|
\fB\-w\fR, \fB\-\-wide\fR
|
|
Switch to the wide mode. The wide mode produces lines longer
|
|
than 80 characters. In this mode \fBbuffers\fR and \fBcache\fR
|
|
are reported in two separate columns.
|
|
.TP
|
|
\fB\-c\fR, \fB\-\-count\fR \fIcount\fR
|
|
Display the result
|
|
.I count
|
|
times. Requires the
|
|
.B \-s
|
|
option.
|
|
.TP
|
|
\fB\-l\fR, \fB\-\-lohi\fR
|
|
Show detailed low and high memory statistics.
|
|
.TP
|
|
\fB\-s\fR, \fB\-\-seconds\fR \fIseconds\fR
|
|
Continuously display the result delay
|
|
.I seconds
|
|
apart. You may actually specify any floating point number for
|
|
.IR delay ,
|
|
.BR usleep (3)
|
|
is used for microsecond resolution delay times.
|
|
.TP
|
|
\fB\-\-si\fR
|
|
Use power of 1000 not 1024.
|
|
.TP
|
|
\fB\-t\fR, \fB\-\-total\fR
|
|
Display a line showing the column totals.
|
|
.TP
|
|
\fB\-\-help\fR
|
|
Print help.
|
|
.TP
|
|
\fB\-V\fR, \fB\-\-version\fR
|
|
Display version information.
|
|
.PD
|
|
.SH FILES
|
|
.TP
|
|
/proc/meminfo
|
|
memory information
|
|
.PD
|
|
.SH "SEE ALSO"
|
|
.BR ps (1),
|
|
.BR slabtop (1),
|
|
.BR top "(1),
|
|
.BR vmstat (8).
|
|
.SH AUTHORS
|
|
Written by Brian Edmonds.
|
|
.SH "REPORTING BUGS"
|
|
Please send bug reports to
|
|
.UR procps@freelists.org
|
|
.UE
|