I use free. Pretty much everybody I know who uses unix knows this. However, more importantly, you can't really show per-process cached ram and sum it up properly (since multiple processes can cache the same disk reads). Not really an issue in Chrome, which manages its own RAM cache (and is the system I was referring to here).
>I'm not sure exactly what you are saying
> This is visible on all systems I work with (mac, win, linux), either attributed to the process, or to OS read cache.
My response was directed at your part of the comment:
>I would expect any system that manages cache data to fill most of your RAM.
All systems do that, but they don't look "used" (eg. on the windows memory graph, the dark region excludes os cached memory). Unless using free[1], no reasonable person would think 99% of their ram's being used.
[1] https://www.linuxatemyram.com/