nix: add a comment on the many nixpkgs-with-cuda instances
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@ -7,6 +7,18 @@
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{ system, ... }:
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{
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_module.args = {
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# Note: bringing up https://zimbatm.com/notes/1000-instances-of-nixpkgs
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# again, the below creates several nixpkgs instances which the
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# flake-centric CLI will be forced to evaluate e.g. on `nix flake show`.
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#
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# This is currently "slow" and "expensive", on a certain scale.
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# This also isn't "right" in that this hinders dependency injection at
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# the level of flake inputs. This might get removed in the foreseeable
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# future.
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#
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# Note that you can use these expressions without Nix
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# (`pkgs.callPackage ./devops/nix/scope.nix { }` is the entry point).
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pkgsCuda = import inputs.nixpkgs {
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inherit system;
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# Ensure dependencies use CUDA consistently (e.g. that openmpi, ucc,
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