[leansensei]

The post explains why I don't want to use disksup. You have to start an extra application (os_mon) and configure disksup to update the starts more frequently than the default of every 30 minutes.

Do we really need to do all that instead of the equivalent of a df?

Agree about the C code, which is why the latest version (on GitHub, the HEAD, not yet released in Hex.pm) is now using Rust and Rustler.

[weatherlight]

:disksup.get_disk_info/1 (from :os_mon) just calls into the underlying OS once, grabs the info, and returns it. It’s not a blocking “long-running monitor” the way a NIF doing I/O in a scheduler thread would be. https://www.erlang.org/docs/26/man/disksup#get_disk_info-1

^ just use this.

:disksup.get_disk_data/0, which caches results in the :disksup server that updates every N seconds (configurable) which is what you are referring to.. https://www.erlang.org/docs/26/man/disksup#get_disk_data-0