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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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3 Dec 2025
@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
@glepage:matrix.orgGaétan LepageOk makes sense! Done.19:23:21
@glepage:matrix.orgGaétan Lepage connor (burnt/out) (UTC-8) the onnx bump should be good to go. 20:50:50
@keiichi:matrix.orgtetoI wonder what priority to set the cache.nixos-cuda.org cache to ? it's the defualt on the webpage but shouldn't a typical user fetch from cache.nixos.org first ? in terms of cost etc, is there any preference ? 21:17:23
@hexa:lossy.networkhexa (UTC+1)the priority is set on the server-side no?21:18:07
@hexa:lossy.networkhexa (UTC+1)and yes, you'll always want to prefer c.n.o21:18:28
@glepage:matrix.orgGaétan Lepage You can also append ?priority=3 to the substituters in /etc/nix/nix.conf 21:20:09
@hexa:lossy.networkhexa (UTC+1)ah ok21:20:19
@keiichi:matrix.orgtetoha yeah the server shows 50 as default https://cache.nixos-cuda.org/ so I have nothing to do nice :) 22:22:24
@keiichi:matrix.orgteto (I was indeed thinking of ?priority ) 22:22:39
@hexa:lossy.networkhexa (UTC+1)it does now 😛22:24:16

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