Probably a stupid question, but is there a good reliable way to run pants commands with nice? I guess once pantsd is started you have to renice it, but you also never know when pantsd will need to be restarted, so you'd have to nice the invocation of

./pants

too? Like this:

renice 19 $(cat .pids/**/pid)
nice ./pants ...

Does this make sense or am I thinking about this all wrong?

Would you want all invoked subprocesses to also be `nice`’d?

yeah that's actually what I want niced

that’s charitable 😉

That would be useful in the future

also this is a relatively easy change to make to Pants especially for a new contributor. Define an option (e.g.,

--subprocess-environment-priority=...

), thread it through into the local execution runner in Rust (there are several PRs that serve as examples), and then invoke the correct API from the libc crate to set the nice value (probably using https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.pre_exec on the

Command

and

setpriority

https://docs.rs/libc/0.2.117/libc/fn.setpriority.html)