Questions[ram-usage](ubuntu)

Some time ago I noticed a lot of ram(1.8/8GB) being used when my system was idle with only a day of uptime. I had to reinstall my Ubuntu because of some reason and now the ram usage has risen up much more. I only have a 26 hours of uptime and this is the result of free -m when my system is idle

          total        used        free      shared  buff/cache   available
Mem:      7738        3622        2810         136        1304        3720
Swap:     2047         271        1776

This is 3.6GB/8GB when my system is idle. The ram usage remains same when I turn off all the extensions too.This is way too much. I'm also posting a screenshot of processes running at this time. And this is not that my system automatically adjusts ram when I open applications, I'm only able to open very limited applications from before. This is way more than windows has ever used on idle.

Can someone please help me avoid this issue?

I'm running Ubuntu 20.04. I just switched from Windows a few weeks ago. I have 32GB RAM, which should be plenty even for what I'm doing, but I've had games crashing and after investigation I seem to constantly be at 95-99% memory usage. Looking at the system monitor "Processes" page, I should only be using around 10GB or so, but on the "Resources" page it is showing 30+. Even after a complete reboot, getting all my normal programs up brought it straight to 22GB or so on the "Resources" page (still just 10 according to "Processes"), then over several hours it climbed back to max out without opening any new programs. I can't track down the offending program efficiently if it isn't showing in the processes, so what can I do?

I checked buffer/cache mentioned in previous questions/answers and that accounts for only a small amount of the discrepancy. I also read there was a memory leak in GNOME a while back, but restarting it didn't change the used memory at all.

Processes:

^{(Click images to enlarge)}

Resources:

Console buffer check

I see the usage of "MiB" as measure to represent the size in Ubuntu. What does MiB stand for? In particular the "i"?

How do i create RAM drive under ubuntu. And would he automounted at startup?

When I open a RAM-intensive app (VirtualBox set at 2GB of RAM), some swap space is generally used, depending on what else I have open at the time.

However, when I quit that last application, the 2GB of RAM is freed up, but the same swap space use remains.

For example, right now, about two hours after having closed VirtualBox, I have 1.6GB free RAM and still 770MB in swap.

How can I tell Ubuntu to stop using that swap and to revert to using the RAM?