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diff --git a/man/free.1 b/man/free.1 new file mode 100644 index 0000000..cfe9509 --- /dev/null +++ b/man/free.1 @@ -0,0 +1,169 @@ +.\" +.\" Copyright (c) 2011-2023 Craig Small <csmall@dropbear.xyz> +.\" Copyright (c) 2013-2023 Jim Warner <james.warner@comcast.net> +.\" Copyright (c) 2011-2012 Sami Kerola <kerolasa@iki.fi> +.\" Copyright (c) 2002-2003 Albert Cahalan +.\" Copyright (c) 1993 Matt Welsh <mdw@sunsite.unc.edu> +.\" +.\" This program is free software; you can redistribute it and/or modify +.\" it under the terms of the GNU General Public License as published by +.\" the Free Software Foundation; either version 2 of the License, or +.\" (at your option) any later version. +.\" +.\" +.TH FREE 1 "2023-05-02" "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 usable memory (MemTotal and SwapTotal in /proc/meminfo). This includes +the physical and swap memory minus a few reserved bits and kernel binary code. +.TP +\fBused\fR +Used or unavailable memory (calculated as \fBtotal\fR - \fBavailable\fR) +.TP +\fBfree\fR +Unused memory (MemFree and SwapFree in /proc/meminfo) +.TP +\fBshared\fR +Memory used (mostly) by tmpfs (Shmem in /proc/meminfo) +.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 SReclaimable 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\-\-kibi\fR +Display the amount of memory in kibibytes. This is the default. +.TP +\fB\-m\fR, \fB\-\-mebi\fR +Display the amount of memory in mebibytes. +.TP +\fB\-g\fR, \fB\-\-gibi\fR +Display the amount of memory in gibibytes. +.TP +\fB\-\-tebi\fR +Display the amount of memory in tebibytes. +.TP +\fB\-\-pebi\fR +Display the amount of memory in pebibytes. +.TP +\fB\-\-kilo\fR +Display the amount of memory in kilobytes. Implies --si. +.TP +\fB\-\-mega\fR +Display the amount of memory in megabytes. Implies --si. +.TP +\fB\-\-giga\fR +Display the amount of memory in gigabytes. Implies --si. +.TP +\fB\-\-tera\fR +Display the amount of memory in terabytes. Implies --si. +.TP +\fB\-\-peta\fR +Display the amount of memory in petabytes. Implies --si. +.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 + Ki = kibibyte + Mi = mebibyte + Gi = gibibyte + Ti = tebibyte + Pi = pebibyte +.fi +.sp +If unit is missing, and you have exbibyte of RAM or swap, the number is in +tebibytes 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\-L\fR, \fB\-\-line\fR +Show output on a single line, often used with the +.B \-s +option to show memory statistics repeatedly. +.TP +\fB\-s\fR, \fB\-\-seconds\fR \fIdelay\fR +Continuously display the result \fIdelay\fR seconds +apart. You may actually specify any floating point number for +\fIdelay\fR using either . or , for decimal point. +.BR usleep (3) +is used for microsecond resolution delay times. +.TP +\fB\-\-si\fR +Use kilo, mega, giga etc (power of 1000) instead of kibi, mebi, gibi (power +of 1024). +.TP +\fB\-t\fR, \fB\-\-total\fR +Display a line showing the column totals. +.TP +\fB\-v\fR, \fB\-\-committed\fR +Display a line showing the memory commit limit and amount of committed/uncommitted +memory. The \fBtotal\fR column on this line will display the memory commit +limit. This line is relevant if memory overcommit is disabled. +.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 BUGS +The value for the \fBshared\fR column is not available from kernels before +2.6.32 and is displayed as zero. +.TP +Please send bug reports to +.UR procps@freelists.org +.UE +.SH "SEE ALSO" +.BR ps (1), +.BR slabtop (1), +.BR top "(1), +.BR vmstat (8). |