Abnormally high ram usage on idle (NixOS)

DeaDvey@lemmy.ml to Linux@lemmy.ml – 29 points –

My computer over the last week has (after using the computer for a few hours) shown very high ram usage, around 50 - 60% out of 32GB, even though nothing in htop appears to be the culprit with the highest consumer being Firefox at 1.6% ram, even in a tty, around half of my ram is being used up even though no process shows over 0.1% ram. Rebooting does seem to work, but I'd prefer not to every few hours. Do you think it might be an issue with hardware? I did build my pc so perhaps something's broken?

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               total        used        free      shared  buff/cache   available
Mem:           32032       20961        2048         464        9022       10152
Swap:           2048         138        1909

Here's the output

Something's using a lot of memory. It's not just buffer/cache memory. That's definitely not normal.

Did it just recently start using that much memory? I would suspect that something has a memory leak.