nix: add a comment on the many nixpkgs-with-cuda instances

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Someone Serge 2024-01-21 03:29:38 +00:00 committed by Someone
parent 5e97ec91ae
commit 28603cd283

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