nixos/nix
1
1
Fork 0
mirror of https://github.com/NixOS/nix.git synced 2025-11-08 19:46:02 +01:00
Code Activity
nix/doc/manual/rl-next/build-cores-auto-detect.md
DavHau fb5e22e318 build-cores: detect cores automatically if set to 0 
This changes makes nix detect a machines available cores automatically whenever build-cores is set to 0.

So far, nix simply passed NIX_BUILD_CORES=0 whenever build-cores is set to 0. (only when build-cores is unset it was detecting cores automatically)

The behavior of passing NIX_BUILD_CORES=0 leads to a performance penalty when sourcing nixpkgs' generic builder's `setup.sh`, as setup.sh has to execute `nproc`. This significantly slows down sourcing of setup.sh
2025-07-07 10:33:42 +07:00

379 B
Raw Blame History

synopsis prs
`build-cores = 0` now auto-detects CPU cores
13402

When build-cores is set to 0, nix now automatically detects the number of available CPU cores and passes this value via NIX_BUILD_CORES, instead of passing 0 directly. This matches the behavior when build-cores is unset. This prevents the builder from having to detect the number of cores.