(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.
Shows overall percentage. Sums to ~100%, regardless of core amount.
Based on running ps
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
smemtool 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
Shows how swapped-out (/ allocated-in-swap) size, by program names.
Based on reading /proc/*/status
- learn curses better
- stop misunderstanding curses colors
- fix layouting bugs (it's integer rounding things)
- fix redrawing