This GTK app for Linux [0] puts up a progress bar showing how much data is left in the "Dirty" and "Writeback" buffers. For good measure it also shows the progress on most simple file operations such as cp or mv.

The main purpose is to scratch my own itch when copying large files onto a USB drive. I want to be able to see the progress of sync (or "eject") operations whose feedback usually amounts to "wait" or "finished" !

At the CLI, of course, you can instead run progress [1] or just manually grep for "Writeback" in /proc/meminfo [2] but personally I like having something graphical!

[0] https://github.com/dcminter/meminfo-rs

[1] https://github.com/Xfennec/progress

[2] https://man7.org/linux/man-pages/man5/proc_meminfo.5.html