Difference between revisions of "Free (command)"
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↑ http://man7.org/linux/man-pages/man1/free.1.html
↑ https://unix.stackexchange.com/questions/87908/how-do-you-empty-the-buffers-and-cache-on-a-linux-system
Tags: Mobile web edit, Mobile edit |
Tags: Mobile web edit, Mobile edit |
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# Emptying 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> | # Emptying 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. | # Use <code>[[fio]]</code> with <code>direct=0</code> to fill up your cache. | ||
| − | # Review historical memory usage with: <code>[[sar -r]]</code> | + | # Review historical memory usage with: <code>[[sar -r --human]]</code> |
== See also == | == See also == | ||
Revision as of 10:27, 10 May 2020
free [1] display amount of free and used memory in the system
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
Activities
- Emptying the buffers cache:
free -h && sync && echo 3 > /proc/sys/vm/drop_caches && free -h[2] - Use
fiowithdirect=0to fill up your cache. - Review historical memory usage with:
sar -r --human
See also
syncsar -r- RAM and filesystem
- Swap,
swapon,swapoff,mkswap,swaplabel,free,sar -r,sar -S,sar -W,vmstat,vm.swappiness,/proc/swaps,/etc/fstab, Add a swap disk,systemd.swap - linux-ftools
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