I’m using ambrop72’s fix on 19.03pre154487.0a7e258012b (Koi).
hardware.nvidia.modesetting.enable = true;
hardware.nvidia.optimus_prime = {
enable = true;
intelBusId = "PCI:0:2:0";
nvidiaBusId = "PCI:9:0:0";
};
with
nixpkgs.config.allowUnfree = true;
(...)
services.xserver.videoDrivers = [ "nvidia" ];
nvidia-smi seems to work:
$ nvidia-smi
Wed Oct 10 09:49:31 2018
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 390.87 Driver Version: 390.87 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GT 740M Off | 00000000:09:00.0 N/A | N/A |
| N/A 47C P5 N/A / N/A | 80MiB / 2004MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| 0 Not Supported |
+-----------------------------------------------------------------------------+
What I’m trying to do is set up CUDA & nvcc, but I’m finding some issues due to lack of info, like:
- It seems that cudatoolkit isn’t listed as package in nixos packages? But works fine if added in
environment.systemPackages. - The wiki mentions that an additional rule needs to created:
Vulkan, CUDA and OpenCL work, though CUDA needs an additional device creation rule https://github.com/NixOS/nixpkgs/blob/05e375d7103ac51e2da917965c37246c99f1ae4f/nixos/modules/hardware/video/nvidia.nix#L72
Should I add this on my configuration.nix? nvidia.nix already seems to do that.
- There’s no mention in the wiki to Grahamc’s CUDA example repo. Which is what I’ve been trying to emulate.
# CUDA
systemd.services.nvidia-control-devices = {
wantedBy = [
"multi-user.target"
];
serviceConfig.ExecStart = "${pkgs.linuxPackages.nvidia_x11}/bin/nvidia-smi";
};
However, while trying to build the examples:
$ cd cuda-samples
$ nix-build default.nix -A examplecuda
error: Package ‘cudatoolkit-9.1.85.1’ in /nix/store/wly35vrz5p3vhbjpf2xsr4zgqqyhsjvm-nixos-19.03pre154487.0a7e258012b/nixos/pkgs/development/compilers/cudatoolkit/default.nix:145 has an unfree license (‘unfree’), refusing to evaluate.
a) For `nixos-rebuild` you can set
{ nixpkgs.config.allowUnfree = true; }
in configuration.nix to override this.
b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
{ allowUnfree = true; }
to ~/.config/nixpkgs/config.nix.
Edit: nvidia-control-devices seems to fail to start.
sudo systemctl status nvidia-control-devices.service
● nvidia-control-devices.service
Loaded: loaded (/nix/store/7wc1p30n6ysi44jz9dcsi06f9hzwprzw-unit-nvidia-control-devices.service/nvidia-control-devices.service; enabled; vendor>
Active: failed (Result: exit-code) since Wed 2018-10-10 10:11:59 -03; 1s ago
Process: 2362 ExecStart=/nix/store/wkbhrvlnngd1r3mgc7075qcl3ql3splb-nvidia-x11-390.87-4.14.74/bin/nvidia-smi (code=exited, status=203/EXEC)
Main PID: 2362 (code=exited, status=203/EXEC)
