[Bug?] memory stats on macOS and Windows don't match 0.8.0 after migration to sysinfo

[ClementTsang]

Checklist

• I've looked through troubleshooting, known problems, and existing open issues for similar issues.

Describe the issue

Behaviour changed after #1036.

macOS

On macOS, the reported used memory usage is way too high to be correct. Figured this one out at least. The issue is that it displays memory used + cached files, whereas the previous one reported something closer to htop. The new value is closer to what something like top or the Activity Monitor reports.

Now, is this behaviour better? Unfortunately, it seems like this might boil down to "what are we measuring?" - not necessarily straightforward. One thing I'm not a fan of regarding the new value is that it'll just always show memory usage pinned at near 100%. Maybe what we should do is separate memory used vs cached files, a la Activity Monitor, if possible?

Related issue: #785

Windows

On Windows, "swap", or paged memory, is lower both in usage and total amount. Not sure why sysinfo reports it this way, will look at what heim is doing.

What operating system and version are you using?

macOS Catalina, Windows 11

What architecture are you using?

x86_64 / AMD64, arm64

What terminal(s) are you running bottom on?

iTerm, Alacritty

What version of bottom are you running?

master

How did you install bottom?

Repos (developing)

How can we reproduce this?

Turn it on and look.

Additional information

No response