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nix-daemon: Fix builduser count to work when maxJobs is auto #65709

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merged 1 commit into from Aug 1, 2019

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c00w
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@c00w c00w commented Aug 1, 2019

Motivation for this change

I wanted to set nix.maxJobs="auto"

This should probably have a test added.

Fixes #65708

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
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@@ -467,7 +467,7 @@ in
fi
'';

nix.nrBuildUsers = mkDefault (lib.max 32 cfg.maxJobs);
nix.nrBuildUsers = mkDefault (lib.max 32 (if cfg.maxJobs == "auto" then 0 else cfg.maxJobs));
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This option becomes interesting once you have more then 32 hyper threads/cores :)

@Mic92 Mic92 merged commit f477314 into NixOS:master Aug 1, 2019
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nix.maxJobs is broken with "auto"
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