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9315d00f01
Previously the shared memory column was always zero for 2.6 series kernels (and later) due to the fact, that the value was taken from the MemShared entry that disappeared with 2.6 series kernels. Later a new Shmem entry appeared in the /proc/meminfo file and the 'shared' column now displays either the MemShared or the Shmem value (depending on their presence - the presence is mutually exclusive). If none of the two entries is exported by the kernel, then the column is zero.
101 lines
2.5 KiB
Groff
101 lines
2.5 KiB
Groff
.\" -*-Nroff-*-
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.\" This page Copyright (C) 1993 Matt Welsh, mdw@sunsite.unc.edu.
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.\" Long options where added at April 15th, 2011.
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.\" Freely distributable under the terms of the GPL
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.TH FREE 1 "September 2011" "procps-ng" "User Commands"
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.SH NAME
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free \- Display amount of free and used memory in the system
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.SH SYNOPSIS
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.B free
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.RI [ options ]
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.SH DESCRIPTION
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.B free
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displays the total amount of free and used physical and swap memory in the
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system, as well as the buffers used by the kernel.
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The shared memory column represents either the MemShared value (2.4 series
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kernels) or the Shmem value (2.6 series kernels and later) taken from the
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/proc/meminfo file. The value is zero if none of the entries is exported
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by the kernel.
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.SH OPTIONS
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.TP
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\fB\-b\fR, \fB\-\-bytes\fR
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Display the amount of memory in bytes.
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.TP
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\fB\-k\fR, \fB\-\-kilo\fR
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Display the amount of memory in kilobytes. This is the default.
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.TP
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\fB\-m\fR, \fB\-\-mega\fR
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Display the amount of memory in megabytes.
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.TP
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\fB\-g\fR, \fB\-\-giga\fR
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Display the amount of memory in gigabytes.
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.TP
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\fB\-\-tera\fR
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Display the amount of memory in terabytes.
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.TP
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\fB\-h\fR, \fB\-\-human\fP
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Show all output fields automatically scaled to shortest three digit unit and
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display the units of print out. Following units are used.
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.sp
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.nf
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B = bytes
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K = kilos
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M = megas
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G = gigas
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T = teras
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.fi
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.sp
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If unit is missing, and you have petabyte of RAM or swap, the number is in
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terabytes and columns might not be aligned with header.
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.TP
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\fB\-c\fR, \fB\-\-count\fR \fIcount\fR
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Display the result
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.I count
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times. Requires the
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.B \-s
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option.
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.TP
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\fB\-l\fR, \fB\-\-lohi\fR
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Show detailed low and high memory statistics.
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.TP
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\fB\-o\fR, \fB\-\-old\fR
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Display the output in old format, the only difference being this option
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will disable the display of the "buffer adjusted" line.
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.TP
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\fB\-s\fR, \fB\-\-seconds\fR \fIseconds\fR
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Continuously display the result delay
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.I seconds
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apart. You may actually specify any floating point number for
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.IR delay ,
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.BR usleep (3)
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is used for microsecond resolution delay times.
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.TP
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\fB\-\-si\fR
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Use power of 1000 not 1024.
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.TP
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\fB\-t\fR, \fB\-\-total\fR
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Display a line showing the column totals.
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.TP
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\fB\-\-help\fR
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Print help.
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.TP
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\fB\-V\fR, \fB\-\-version\fR
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Display version information.
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.PD
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.SH FILES
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.TP
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/proc/meminfo
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memory information
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.PD
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.SH "SEE ALSO"
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.BR ps (1),
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.BR slabtop (1),
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.BR top "(1),
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.BR vmstat (8).
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.SH AUTHORS
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Written by Brian Edmonds.
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.SH "REPORTING BUGS"
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Please send bug reports to
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.UR procps@freelists.org
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.UE
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