Le 01/03/2019 à 18:56, Reco a écrit :
First, there's huge amount of unused (not to be confused with "free") memory on your host. And no, it's not a filesystem's cache (600M), it's really "nothing there"-unused memory which amounts 1880M.
This is the amount reported in /proc/meminfo as MemFree - not MemUnused. Can you please explain your definitions of "free" and "unused" memory ?
Taking it all into the account, I propose the following scenario - not a long time ago there was a process (or a couple of those). Was it the browser, or something written in Java (or Python), or some kind of Virtual Machine - is not relevant, but it did consume RAM. But it got terminated, and what we're seeing here is the aftermath.
Another scenario : at some point the pagecache (file cache) grew much bigger due to massive file read/write operation, then the files were deleted or the filesystem was unmounted and the file cache pages were freed.