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NixOS CUDA

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CUDA packages maintenance and support in nixpkgs | https://github.com/orgs/NixOS/projects/27/ | https://nixos.org/manual/nixpkgs/unstable/#cuda57 Servers

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2 Dec 2025
@glepage:matrix.orgGaétan Lepage connor (burnt/out) (UTC-8) I approved your onnx PR 08:14:41
@glepage:matrix.orgGaétan LepageI can tackle the bump to 1.20.0 after it's merged08:14:56
@keiichi:matrix.orgtetois caching disabled for unstable ? I have to build onnxruntime and then I read this https://discourse.nixos.org/t/cuda-cache-for-nix-community/56038/3 11:45:21
@hexa:lossy.networkhexa (UTC+1)building cuda packages on nix-community was discontinued12:07:37
@hexa:lossy.networkhexa (UTC+1)there is now the flox cache, which builds for their versions of nixpkgs12:08:00
@hexa:lossy.networkhexa (UTC+1)* there is now the flox cache, which builds for their versions of nixpkgs, which don't really align with our channels12:08:09
@hexa:lossy.networkhexa (UTC+1)and possibly the build results from nixos-cuda.org12:08:32
@keiichi:matrix.orgtetoI had totally missed that. The discourse comment made it sound like it is retaliation against flox actions ?12:11:30
@hexa:lossy.networkhexa (UTC+1)Redacted or Malformed Event12:45:08
@connorbaker:matrix.orgconnor (burnt/out) (UTC-8)I am 🔪23:20:33
@connorbaker:matrix.orgconnor (burnt/out) (UTC-8)

okay how the hell did you all manage to debug this on master:

error: output '/nix/store/pb5lmj07b9vs4awlxrga9s6wkfzzrk1i-onnxruntime-1.22.2-dev' is not allowed to refer to the following paths:
         /nix/store/rf7a79c1a73ny3j6jw77nza4wd5z40i1-cuda11.4-cuda_nvcc-11.4.152
23:20:49
@connorbaker:matrix.orgconnor (burnt/out) (UTC-8)(I am building ONNX Runtime for CUDA 11.4 for a single architecture)23:21:13
@connorbaker:matrix.orgconnor (burnt/out) (UTC-8) CC Gaétan Lepage SomeoneSerge (back on matrix) 23:21:23
3 Dec 2025
@connorbaker:matrix.orgconnor (burnt/out) (UTC-8) ugh
it's through cudnn-frontend
because https://github.com/NVIDIA/cudnn-frontend/blob/0258951d4d512f4714eb1574496f4d57669b1b93/CMakeLists.txt#L43 means the generate cmake target has the include directory of NVCC
and since I made NVCC a single-output derivation, the output containing include and bin are one and the same
so ONNX Runtime's disallowedRequisites = lib.optionals cudaSupport [ (lib.getBin cuda_nvcc) ]; is tripped because of the cmake config from cudnn-frontend
so I guess I'm trying to split up NVCC again
fml
00:09:44
@glepage:matrix.orgGaétan Lepage FYI, https://hydra.nixos-cuda.org is now building nixos-25.11-small too :) 09:50:51
@glepage:matrix.orgGaétan Lepage * FYI (for stable channel users), https://hydra.nixos-cuda.org is now building nixos-25.11-small too :) 09:51:06
@hexa:lossy.networkhexa (UTC+1)after renaming you need to toggle the jobsets for them to work again09:52:00
@hexa:lossy.networkhexa (UTC+1)otherwise they just09:52:10
@hexa:lossy.networkhexa (UTC+1)

evaluation failed with exit code 255

09:52:15
@hexa:lossy.networkhexa (UTC+1)as can be seen here https://hydra.nixos-cuda.org/jobset/nixos-cuda/cuda-packages-unstable#tabs-errors09:52:24
@hexa:lossy.networkhexa (UTC+1)and here https://hydra.nixos-cuda.org/jobset/nixos-cuda/cuda-packages-legacy#tabs-errors09:52:38
@hexa:lossy.networkhexa (UTC+1)https://github.com/NixOS/hydra/issues/128809:52:56
@glepage:matrix.orgGaétan Lepage Thanks for the tip hexa (UTC+1)! 09:54:14
@hexa:lossy.networkhexa (UTC+1) Gaétan Lepage: you probably also want a lower priority (higher value) than cache.nixos.org 15:58:01
@hexa:lossy.networkhexa (UTC+1) * Gaétan Lepage: you probably also want a lower priority (higher value) than cache.nixos.org, which has prio 30 15:58:10
@glepage:matrix.orgGaétan LepageWhat are you referring to? Something in the nix-cuda infra?17:36:09
@hexa:lossy.networkhexa (UTC+1)https://cache.nixos-cuda.org/nix-cache-info18:22:39
@hexa:lossy.networkhexa (UTC+1)https://cache.nixos.org/nix-cache-info18:22:52
@hexa:lossy.networkhexa (UTC+1)harmonia is greedy18:23:00
@hexa:lossy.networkhexa (UTC+1)this makes everyone who wants to substitute prefer nixos-cuda over c.n.o18:23:28

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