https://gist.github.com/dunhamsteve/59f5e6b9a4bc69039853674d...
re: memory usage, because of the price of RAM these days, my original plan was for a hierarchical memory usage analyzer, but attribution of shared libraries on Linux isn't straightforward.
"Real" memory usage is unfortunately ill-defined since it could mean "memory freed by killing a process", "memory allocated specifically to the process", "proportional of system memory shared by other processes", etc.
Such a tool would likely need multiple subcommands to reflect how the user's intent, along with an extensive README to explain the subtleties.
To illustrate, if we only show the proportional set size in a hierarchy (e.g. IDE with LSP... I'm looking at you rust-analyzer!), but the user wants to know how much memory could be reclaimed by killing the parent process, two things could happen, as far as I understand. If it's the only hierarchy using a large chunk of shared libraries, the PSS will be pretty close. However, if other apps are using those libraries, very little memory will be freed (mostly what was allocated specifically to the killed app).
On top of that, we also have to consider swap space.
I may revisit this in the future once I have a better understanding of smaps and friends, if RAM prices don't normalize anytime soon.