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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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12 Nov 2025
@arilotter:matrix.orgAri Lotterfails :)17:15:03
@arilotter:matrix.orgAri Lotterrunning again to hopefully get a real message..17:15:11
@daniel-fahey:matrix.orgDaniel Faheyany luck with this approach?17:22:28
@arilotter:matrix.orgAri Lotterah will try that next17:22:41
@arilotter:matrix.orgAri Lottershould i just import from hydra?17:23:18
@arilotter:matrix.orgAri Lotterthen move on?17:23:20
@daniel-fahey:matrix.orgDaniel FaheyUp to you, I'm in your debt already, I thought you were having fun messing about and learning17:53:34
@arilotter:matrix.orgAri Lotteroh yeah i meant like, to run review17:56:26
@arilotter:matrix.orgAri Lotterhow big is this closure lmao17:56:30
@arilotter:matrix.orgAri Lotterim at 3gb downloaded so far17:56:34
@arilotter:matrix.orgAri Lotteroh there we go17:56:40
@arilotter:matrix.orgAri Lotterok will try the review again heh17:57:13
@arilotter:matrix.orgAri Lotter

huh. nixpkgs at b3d51a0365f6695e7dd5cdf3e180604530ed33b4 (based off nixos-unstable)` seems to have something broken with torch / cuda / cudnn...
torch 2.8 worked fine, but 2.9 with my same application code throws

[cuda:0]: cuDNN Frontend error: No valid engine configs for Matmul_MUL_ADD_Reduction_SUB_EXP_Reduction_LOG_ADD_DIV_Matmul_
{"engineId":2,"smVersion":900,"knobChoices":{"CUDNN_KNOB_TYPE_KERNEL_CFG":7}}
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: Could not open libnvrtc at: this->libnvrtc == nullptr
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: compiler.load()
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: rtk(kernelNumRunning)->loadDLL()
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: status == CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: ptr->isSupported()
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: finalize_internal()

{"engineId":1,"smVersion":900,"knobChoices":{"CUDNN_KNOB_TYPE_KERNEL_CFG":3}}
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: Could not open libnvrtc at: this->libnvrtc == nullptr
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: compiler.load()
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: rtk(kernelNumRunning)->loadDLL()
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: status == CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: ptr->isSupported()
Warning: CUDNN_STATUS_NOT_SUPPORTED_RUNTIME_PREREQUISITE_MISSING; Reason: finalize_internal()
17:58:30
@arilotter:matrix.orgAri Lottermissing nvrtc i guess..17:58:40
@arilotter:matrix.orgAri Lottergonna compare against my weird 2.9.0-nightly setup i was using before..18:00:37
@daniel-fahey:matrix.orgDaniel FaheyWould need a reprex I think with the smallest bit of your application code that can trigger this18:40:46

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