Editing Free (command)

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<code>free</code> display amount of free and used [[memory]] in the system. It is included in <code>[[procps]]</code> package.
* https://man7.org/linux/man-pages/man1/free.1.html

 free -h
              total        used        free      shared  buff/cache   available
 Mem:           503G         21G         43G        2.1M        438G        478G
 Swap:          975M         50M        925M

 free
              total        used        free      shared  buff/cache   available
 Mem:      528029540    22891532    48868648        2128   456269360   501718128
 Swap:        999420       51456      947964

No [[swap]] configured:
 free -h
              total        used        free      shared  buff/cache   available
 Mem:           985M        468M         79M         65M        437M        302M
 [[Swap]]:            0B          0B          0B

 free -g

== Activities ==
# Empty the [[buffers cache]]: <code>free -h && [[sync]] && echo 3 > /proc/sys/vm/[[drop_caches]] && free -h</code><ref>https://unix.stackexchange.com/questions/87908/how-do-you-empty-the-buffers-and-cache-on-a-linux-system</ref>
# Use <code>[[fio]]</code> with <code>direct=0</code> to fill up your cache.
# Review historical memory usage with: <code>[[sar -r --human]]</code>
# Review <code>[[/proc/meminfo]]</code>
#  <code>[[ps]] -eo pid,user,s,comm,size,vsize,rss --sort -size | head</code>

== See also ==

* [[free (C)]]
* <code>[[sync]]</code>
* <code>[[sar -r]]</code>
* [[RAM]] and [[file Systems|filesystem]]
* {{swap}}
* [[linux-ftools]]

[[Category:Linux]]