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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/#cuda60 Servers

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10 Mar 2026
@glepage:matrix.orgGaétan Lepage I got you connor (burnt/out) (UTC-8)
https://github.com/NixOS/nixpkgs/pull/498523
11:52:20
@glepage:matrix.orgGaétan Lepage We do have libcublasmp. Is this doc outdated? https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/cuda-modules/README.md#distinguished-packages 12:31:03
@connorbaker:matrix.orgconnor (he/him)Ah yep it’s outdated, I packages nvshmem: https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/cuda-modules/packages/libnvshmem.nix15:28:13
@glepage:matrix.orgGaétan Lepage connor (burnt/out) (UTC-8) if I want to bump libcublasmp (to 0.7.x) for example, how do I know which cudaPackage_X should be affected? 17:36:23
@connorbaker:matrix.orgconnor (he/him)A very deep reading of the changelog, package contents changes, and thorough rebuilds and runtime verification for consumers17:38:14
@connorbaker:matrix.orgconnor (he/him)Yet another reason we need test suites for downstream packages which exercise those libraries — relying on NVIDIA’s samples (if they’re even available) isn’t sufficient because we care about whether consumers break17:39:46
@connorbaker:matrix.orgconnor (he/him)All of the assertions I added to the packages were the result of a ton of reading and gleaning meaning through changelogs and actual package contents changes17:40:16
@glepage:matrix.orgGaétan LepageSounds like a ton of fun :')17:47:23
@cameron-matrix:matrix.orgCameron Barker joined the room.18:18:26
11 Mar 2026
@justbrowsing:matrix.orgKevin Mittman (jetlagged/UTC+8)Redacted or Malformed Event01:54:11
@glepage:matrix.orgGaétan Lepage connor (burnt/out) (UTC-8) would you agree with a 12.8 -> 12.9 global bump before messing around with 13.0? 11:05:21
@ctheune:matrix.flyingcircus.ioTheuni changed their display name from Theuni to Christian Theune.14:13:00
@connorbaker:matrix.orgconnor (he/him)Sure! I remember some weird breakages a while back when I had wanted to bump immediately after 12.9 became available, but hopefully they’re all resolved by now :)16:08:54
@glepage:matrix.orgGaétan Lepage https://github.com/NixOS/nixpkgs/pull/498861 16:43:46
@glepage:matrix.orgGaétan Lepage

connor (burnt/out) (UTC-8)
About https://github.com/NixOS/nixpkgs/pull/498681, I plan to build torch and vllm. If this works fine, I will merge it.
With the CUDA PRs on the way, I won't have the capacity to exhaustively test all of them.

No objection on your side?

23:37:24
@glepage:matrix.orgGaétan Lepage (same reasonning for https://github.com/NixOS/nixpkgs/pull/498678#issuecomment-4035473707). 23:39:46
@glepage:matrix.orgGaétan Lepage * (same reasonning for https://github.com/NixOS/nixpkgs/pull/498678). 23:39:52
@connorbaker:matrix.orgconnor (he/him)Sounds good! I’ll leave a comment on them23:51:04
@glepage:matrix.orgGaétan Lepage I'm testing the CUDA bump more thoroughly though.
~1.3k rebuilds left (out of 1.8k)
23:53:19
@glepage:matrix.orgGaétan Lepage *

connor (burnt/out) (UTC-8)
About https://github.com/NixOS/nixpkgs/pull/498681, I plan to build torch and vllm. If this works fine, I will merge it.
With all the CUDA PRs in the queue, I won't have the capacity to exhaustively test all of them.

No objection on your side?

23:54:04
12 Mar 2026
@ctheune:matrix.flyingcircus.ioTheuni changed their display name from Christian Theune to Theuni.07:18:55
4 Aug 2022
@winterqt:nixos.devWinter (she/her) joined the room.03:26:42
@winterqt:nixos.devWinter (she/her)(hi, just came here to read + respond to this.)03:28:52
@tpw_rules:matrix.orgtpw_ruleshey. i had previously sympathzied with samuela and like i said before had some of the same frustrations. i just edited my github comment to add "[CUDA] packages are universally complicated, fragile to package, and critical to daily operations. Nix being able to manage them is unbelievably helpful to those of us who work with them regularly, even if support is downgraded to only having an expectation of function on stable branches."03:29:14
@winterqt:nixos.devWinter (she/her)
In reply to @tpw_rules:matrix.org
i'm mildly peeved about a recent merging of something i maintain where i'm pretty sure the merger does not own the expensive hardware required to properly test the package. i don't think it broke anything but i was given precisely 45 minutes to see the notification before somebody merged it
ugh, 45 minutes? that's... not great. not to air dirty laundry but did you do what samuela did in the wandb PR and at least say that that wasn't a great thing to do? (not sure how else to word that, you get what i mean)
03:30:23
@tpw_rules:matrix.orgtpw_rulesno, i haven't yet, but i probably will03:31:03
@winterqt:nixos.devWinter (she/her) i admittedly did that with a PR once, i forget how long the maintainer was requested for but i merged it because multiple people reported it fixed the issue. the maintainer said "hey, don't do that" after and now i do think twice before merging. so it could help, is what i'm saying. 03:31:50
@tpw_rules:matrix.orgtpw_rulesi'm not sure what went wrong with the wandb PR anyway, i think it was just a boneheaded move on the maintainer's part03:32:10
@winterqt:nixos.devWinter (she/her)(it was also simple enough that it was fine and the maintainer said it looked good after)03:32:15
@tpw_rules:matrix.orgtpw_rules * i'm not sure what went wrong with the wandb PR anyway, i think it was just a boneheaded move on the merger's part03:32:19

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