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Full Discussion: Linux memory usage
Operating Systems Linux Red Hat Linux memory usage Post 84199 by junkmail426 on Thursday 22nd of September 2005 01:50:05 PM
Old 09-22-2005
Linux memory usage

What's the best way to find out how much memory is being used/available? I tried using free, but I didn't quite understand the output. Can someone explain it?

$ free
total used free shared buffers cached
Mem: 16304536 16256376 48160 0 234000 15358344
-/+ buffers/cache: 664032 15640504
Swap: 4194192 0 4194192
$ man free
$ free -m
total used free shared buffers cached
Mem: 15922 15877 44 0 228 15000
-/+ buffers/cache: 649 15273
Swap: 4095 0 4095
 

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FREE(1) 							Linux User's Manual							   FREE(1)

NAME
free - display information about free and used memory on the system SYNOPSIS
free [-b|-k|-m|-g] [-l] [-o] [-t] [-s delay ] [-c count ] DESCRIPTION
free(1) displays the total amount of free and used physical memory and swap space in the system, as well as the buffers and cache consumed by the kernel. OPTIONS
Normal invocation of free(1) does not require any options. The output, however, can be fine-tuned by specifying one or more of the follow- ing flags: -b, --bytes Display output in bytes. -k, --kb Display output in kilobytes (KB). This is the default. -m, --mb Display output in megabytes (MB). -g, --gb Display output in gigabytes (GB). -l, --lowhigh Display detailed information about low vs. high memory usage. -o, --old Use old format. Specifically, do not display -/+ buffers/cache. -t, --total Display total summary for physical memory + swap space. -c n, --count=n Display statistics n times, then exit. Used in conjunction with the -s flag. Default is to display only once, unless -s was speci- fied, in which case default is to repeat until interrupted. -s n, --repeat=n Repeat, pausing every n seconds in-between. -V, --version Display version information and exit. --help Display usage information and exit FILES
/proc/meminfo -- memory information SEE ALSO
ps(1), top(1), vmstat(1) AUTHORS
Written by Robert Love. The procps package is maintained by Rik van Riel and Robert Love and was created by Michael Johnson. Send bug reports to <procps-list@redhat.com>. Linux 18 Nov 2002 FREE(1)
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