this post was submitted on 29 Oct 2023
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There might be an actual issue in your case, but this feels to me like https://www.linuxatemyram.com/
I’m expecting mapping will write a lot of map data to files in your world folder which might explain the apparent high ram usage. Try looking at disk usage while the issue occur maybe ?
It doesn't look like a map data problem to me. My System Monitor applet is showing 10% of RAM used and ~80% cached. The resources tab of my System Monitor is showing 20% used.
I'm guessing from that, that System Monitor doesn't display map data as used RAM. Please correct me if I'm wrong.
If I understand your reply correctly (the output of free would be clearer), having 80% of RAM used as cache would indicate that it is used for caching files such as map and chunk data. This is normal in Linux, and the game would lag more without this feature. The link I shared explains it better than I can.
If you feel this is still not the case, you can share info such as free output, list of open files, etc, while the issue occurs.
Disk caching only benefits spinning rust.
Operating from solid state storage such as SSD or NVME pointlessly wastes CPU/RAM resources juggling memory.
I turn all this archaic nonsense off (as far as I can) when running solid state media.