ba6396f886
This commit adds a new switch -a/--available that appends a new column called 'available' to the output. The column displays an estimation of how much memory is available for starting new applications, without swapping. Unlike the data provided by the 'cached' or 'free' 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.
130 lines
3.3 KiB
Groff
130 lines
3.3 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 "September 2011" "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 total - free)
|
|
.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
|
|
\fBcached\fR
|
|
Memory used by the page cache (Cached in /proc/meminfo)
|
|
.TP
|
|
\fBavailable\fR
|
|
Estimation of how much memory is available for starting
|
|
new applications, without swapping. Unlike the data
|
|
provided by the \fBcached\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)
|
|
.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\-a\fR, \fB\-\-available\fR
|
|
Display the estimation of memory available for starting new applications,
|
|
without swapping. This switch makes the output wider than 80 characters.
|
|
.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\-o\fR, \fB\-\-old\fR
|
|
Display the output in old format, the only difference being this option
|
|
will disable the display of the "buffer adjusted" line.
|
|
.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
|