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 |
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== Activities == | == Activities == | ||
− | # 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 --human]]</code> | # Review historical memory usage with: <code>[[sar -r --human]]</code> |
Revision as of 10:59, 28 April 2021
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
free -g
Activities
- Emptying the buffers cache:
free -h && sync && echo 3 > /proc/sys/vm/drop_caches && free -h
[2] - Use
fio
withdirect=0
to fill up your cache. - Review historical memory usage with:
sar -r --human
- Review
/proc/meminfo
ps -eo pid,user,s,comm,size,vsize,rss --sort -size | head
See also
- free (C)
sync
sar -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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