Feature request: limit CPU usage

[neunenak]

When I apply a large update to multiple foreign hosts using colmena apply, if the update is large enough or involves nix packages requiring a significant amount of computation, every core on my local machine will get pegged with nix build operations and this can cause significant GUI slowdown or even crashes. I'd like it if there was a way to instruct colmena to avoid using every CPU core or otherwise deprioritize itself in favor of GUI operations (it's possible there's a way to do this with standard linux tooling that I'm simply not aware of, but if there is it would be nice if that was documented with colmena's other documentation).

[bjornfor]

Have you tried with colmena --nix-option max-jobs 1 --nix-option cores 1? It's supposed to work when doing local builds, which I think is the default.