On many hosts I’ve a strange problem: RAM usage increase suddenly (for example +20GB), and then stay this high, until I drop cache (echo 3 > /proc/sys/vm/drop_caches , need to do it several times).
I can’t figure out what is using this memory, as it is NOT reported to by used as “cache” in ‘top’.
The top (ordered by ram usage) before drop_cache: https://prnt.sc/lxd45p (29GB used)
The top after dropping cache: https://prnt.sc/lxd64e (dropped to 5GB)
Munin RAM graph: http://prntscr.com/lxdbj3
Could this be related to LXD ?