NixOS CUDA - Public Room Timeline - Matrix Static

	NixOS CUDA	309 Members
	CUDA packages maintenance and support in nixpkgs \| https://github.com/orgs/NixOS/projects/27/ \| https://nixos.org/manual/nixpkgs/unstable/#cuda	60 Servers

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Sender	Message	Time
6 Oct 2025
connor (burnt/out) (UTC-8)	I made a faster diffing thing (but it requires a fair amount of memory): https://github.com/ConnorBaker/nix-nixpkgs-review	14:33:23
connor (burnt/out) (UTC-8)	As an example: `nix build -L .#diffs.x86_64-linux.pkgs-pre-pkgs-cuda-pre --build-dir /run/temp-ramdisk --builders '' --override-input nixpkgs-pre github:NixOS/nixpkgs` will evaluate a copy of nixpkgs using the `nixpkgs-pre` input without CUDA enabled and with CUDA enabled, and then diff the results (each step happens in a separate derivation so there's caching) It's IO and memory hungry though (IO because it's instantiating ~1.5 GB worth of derivations) and memory hungry because it's evaluating all of Nixpksg in a single pass I've written it so it uses DetSys' parallel eval as well	14:39:10
connor (burnt/out) (UTC-8)	Here's the result of that command: https://gist.github.com/ConnorBaker/b1bbb3547d6c15921843ba0e048f94fd	14:41:08
connor (burnt/out) (UTC-8)	When the evaluations of Nixpkgs instantiations are done in the derivations, the `--eval-store` argument is set to the `evalStore` output so we can keep the derivations around. The entries in the `packages` output of the flake are small wrapper scripts which run a nix build using the added and changed derivations -- the `evalStore` outputs are used as extra substituters so derivations are copied as needed into the store and we avoid doing evaluation again	14:44:52
connor (burnt/out) (UTC-8)	Anyway, I built that because I didn't have a way to run `nixpkgs-review` with content-addressed derivations and got irritated that it kept evaluating the base commit of PRs that hadn't changed (all it needed to do was re-evaluate the head of the PR).	14:48:28

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