| 20 Sep 2025 |
 connor (he/him) | Posted a reply back | 21:45:34 |
| 21 Sep 2025 |
 tomberek | Hey, through the GitHub Open Source security program we can get a significant amount of Azure credits. Would the CUDA team be able to effectively use that? Would that make a difference in the maintenance burden? | 14:10:32 |
 SomeoneSerge (back on matrix) | I'm afraid that expert-hours are 146% the scarcest resource right now (as always?) | 15:48:56 |
| SomeoneSerge (back on matrix) | connor (he/him) (UTC-7): repeatedly mentioned he's been experimenting with building nixos images for Azure | 15:49:27 |
| SomeoneSerge (back on matrix) | If we could have ephemeral azure instances with a mutable nix store that would be amazing | 15:50:19 |
| 22 Sep 2025 |
| SomeoneSerge (back on matrix) | Judging by Gaétan Lepage's emoji reaction, he's already imagining them nixpkgs-reviews going brrrrrrrr. Gaétan Lepage would you have the availability for this one? | 08:01:20 |
 Gaétan Lepage | To work on the Azure stuff? | 09:16:35 |
| Gaétan Lepage | I have gained access to a beefy builder since then, so I'm less constrained than before on the x86_64-linux side of things. | 09:17:08 |
 matthewcroughan | SomeoneSerge (back on matrix): can you bump or have you bumped privately https://github.com/NixOS/nixpkgs/blob/nixos-unstable/pkgs/development/python-modules/opensfm/default.nix#L144 ? | 20:19:03 |
| matthewcroughan | I need it for https://github.com/NixOS/nixpkgs/pull/442003 | 20:19:15 |
| matthewcroughan | because none of the SfM tools work properly in nixpkgs anymore | 20:19:27 |
| matthewcroughan | SfM tools are tools that take a dir of image and tag it with inferred data like rotation, coordinates etc, to pipe into gaussian splat utils like brush | 20:19:52 |
| matthewcroughan | https://github.com/NixOS/nixpkgs/pull/438672 | 20:43:43 |
| matthewcroughan | hmm, this gets close to fixing colmap | 20:43:50 |
| 23 Sep 2025 |
| SomeoneSerge (back on matrix) | matthewcroughan: hard pressed right now, maybe end of week... | 00:30:01 |
 hexa | did anyone here make substitions from the flox cache work yet? | 01:51:21 |
| Gaétan Lepage | I had some cache hits is this is your question | 08:23:23 |
| Gaétan Lepage | FYI Zowoq has restored the cuda jobset on nix-community:
https://matrix.to/#/%21PbtOpdWBSRFbEZRLIf%3Anumtide.com/%240hueN5_QPZEhj5g4nqSa-gFgmCYe3CMKlG79bd2E-nM?via=blad.is&via=matrix.org&via=envs.net | 08:24:47 |
 Hugo | @ss:someonex.net Thanks for your feedback on my PR adding Cuda tests.
I implemented most, but cannot test because I cannot rebuild xformers with CUDA enabled 🫤. I tried many times on multiple machines but no luck. It builds fine without Cuda though.
| 10:19:57 |
| Hugo | Redacted or Malformed Event | 10:20:52 |
| Hugo | 
Download Screenshot_20250923_122127.png | 10:22:03 |
| Hugo | 
Download Screenshot_20250923_122117.png | 10:22:24 |
| Hugo | I also find it really weird that CPU stays at 100% while the build is stuck. | 10:22:25 |
| Hugo | Is that a known bug in Nix or in the build tools? | 10:22:55 |
|  kenji changed their display name from a-kenji to kenji. | 10:42:31 |
 Albert Larsan | nvcc spawns multiple compiler instances per invocation, and ninja spawns as many nvcc instances as the number of cores/threads, which makes the CPU overcommited (ex: you have 16 threads, ninja spawn 16 nvcc instances, and each one of the nvcc intances spawns 6 cicc instances, and each cicc instance consumes one full cpu thread. So you end up with 16*6=96 processes trying to run at the same time). The build is not stuck, it just takes a very long time to happen (because it tries to do more at the same time than your computer can handle) | 11:32:01 |
| Hugo | Tanks for this explanation. My impression is more that the system goes OOM and then something gets stuck and never resumes. | 11:44:59 |
| Hugo | Especially since a working build (previous release) finished in 14 minutes. | 12:08:09 |
 Gregor Burger | Hi Guys, quick question is there an equivalent cudaPackages.backendStdenv for clang? | 12:09:25 |
| Gregor Burger | * Hi, quick question is there an equivalent cudaPackages.backendStdenv for clang? | 12:11:37 |
