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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/#cuda59 Servers

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25 Feb 2026
@hugo:okeso.euHugo *

Related to PyTorch but not to 2.10, it looks like my CI cannot build it since yesterday morning (it was still python3.13-torch-2.9.1) 🤔
Torch 2.10.0 does not solve that issue.

I build with:

      run: "cd nixpkgs-master\n  nix-build -I nixpkgs=. --arg config '{ allowUnfree\
        \ = true; cudaSupport = true; openclSupport = true; rocmSupport = false;}'\
        \ --option allow-import-from-derivation false --max-jobs 1 -A python313Packages.torch"

Here is the last log (after 3h12 of build).
https://bpa.st/5CQA

Any idea what could be the cause?

15:22:17
@hugo:okeso.euHugoEdited my message with this link as well.15:22:31
@glepage:matrix.orgGaétan LepageAre you sure that you're not simply OOMing?19:43:36
@hugo:okeso.euHugoI investigated my metrics, it looks like OOM-ing for 2.10, but not for the latest failure of 2.9.1 🤔20:28:31
@hugo:okeso.euHugoI started a build with less cores, will see where that goes (mostl likely from 3.10 to ~5 hours)20:29:13
26 Feb 2026
@ctheune:matrix.flyingcircus.ioChristian Theune joined the room.07:05:25
@ctheune:matrix.flyingcircus.ioChristian Theune👋07:09:09
@ctheune:matrix.flyingcircus.ioChristian Theune Gaétan Lepage: if you need help testing the vllm 0.16 branch, i can do that. 07:27:08
@glepage:matrix.orgGaétan Lepage

Hi! Thanks :)
I rebased the PR yesterday: https://github.com/NixOS/nixpkgs/pull/490175

I couldn't do much as its dependendency xgrammar is broken. Once I'll properly bump the {c,q}utlass et al. overrides, then sure, help with testing will be welcome :)

07:57:01
@glepage:matrix.orgGaétan Lepage From my initial testing, 2.10 is significantly heavier to build.
Took me >1h instead of 45 min to build with cudaSupport on a 64T Threadripper
07:58:09

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