CentOS Linux Server Guide

CentOS Linux system information - memory information

free

command used to display amount of free and used memory in the Centos Linux system.
comand displays the total amount of free and used physical and swap memory in the sys-
tem, as well as the buffers used by the kernel.
The shared memory column should beignored; it is obsolete.

Synopsis

free [options]

Options	Description
-b	displays the amount of memory in bytes
-k	displays memory information in kilobytes
-m	displays memory information iin megabytes.
-t	displays memory information and add in a line containing the totals of memory usage

# free -b
total used free shared buffers cached
Mem: 526786560 507113472 19673088 0 49758208 385011712
-/+ buffers/cache: 72343552 454443008
Swap: 1073733632 0 1073733632

# free -k
total used free shared buffers cached
Mem: 514440 495228 19212 0 48592 375988
-/+ buffers/cache: 70648 443792
Swap: 1048568 0 1048568

#free -m
total used free shared buffers cached
Mem: 502 483 18 0 47 367
-/+ buffers/cache: 69 433
Swap: 1023 0 1023

# free -t
total used free shared buffers cached
Mem: 514440 495228 19212 0 48600 375980
-/+ buffers/cache: 70648 443792
Swap: 1048568 0 1048568
Total: 1563008 495228 1067780

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