square-stat

(Proof of concept version, needs work)

Colored text-shell squarified treemaps presenting things like CPU and memory use.

Tries to group some known process sets, e.g.

• filesystem-related kernel processes
• other kernel processes
• various graphical interface support stuff
• tiny-use processes into 'sumsmaller' so they don't fall away (still tends to be small)

...all mostly because a shell isn't exactly high resolution, and this is for glanced overview.

Dependencies

• curses
• squarify (python package, can install with pip install squarify)
• smem CLI tool (optional)

square-cpu

Shows overall percentage. Sums to ~100%, regardless of core amount.

Based on running ps

square-mem

This one's a test, because

• counting kernel stuff usefully is nontrivial - consider buffers, caches, slab, etc, and how some details overlap, so how they are and are best reported.
  • Also because of practice. It e.g. turns out that in linux, ZFS ARC reports as unreclaimable slab - and is intentionally quite large.
• basic tools don't care abous shared memory at all
  • getting shared memory right is important to accuracy in some uses. One good example is postgresql workers, which extensively using shared memory for efficient sharing of table data.
  • ...in which case just adding up processes totals would over-report quite a lot. The sum of total memory, or free amount (from total-alluse) would also be noticably wrong.
  • The smem tool fixes this, but is slowish and CPU-heavy (not the tool's fault, it's the kernel's information that takes time). Which is why this isn't the default right now.

Based on running ps or smem

square-swap

Shows how swapped-out (/ allocated-in-swap) size, by program names.

Based on reading /proc/*/status

TODO

• learn curses better
  • stop misunderstanding curses colors
  • fix layouting bugs (it's integer rounding things)
  • fix redrawing

Note that there is no point in doing this for the filesystem when things like diskonaut exist.