running

README.md

@@ -0,0 +1,8 @@
+
+Example cuda code compilation in nix.
+
+```bash
+$ nix run github:osbm/cuda-kernel-nix
+Free mem: 22112 MB Total mem: 24078 MB
+Free mem: 21 GB Total mem: 23 GB
+```

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1734988233,
+        "lastModified": 1756159630,
-        "narHash": "sha256-Ucfnxq1rF/GjNP3kTL+uTfgdoE9a3fxDftSfeLIS8mA=",
+        "narHash": "sha256-ohMvsjtSVdT/bruXf5ClBh8ZYXRmD4krmjKrXhEvwMg=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "de1864217bfa9b5845f465e771e0ecb48b30e02d",
+        "rev": "84c256e42600cb0fdf25763b48d28df2f25a0c8b",
         "type": "github"
       },
       "original": {

flake.nix

@@ -29,20 +29,39 @@
     packages."${system}" = {
       # just one main.cu file for now
       # compile it and place it to $out/bin/cuda-kernel
-      cuda-kernel = pkgs.stdenv.mkDerivation {
+      cuda-kernel = let
-        name = "cuda-kernel";
+        # Use CUDA 12.0 which should be compatible with driver 580.76.05
-        src = ./.;
+        cudaPackages = pkgs.cudaPackages;
-        buildInputs = with pkgs; [
+        cudatoolkit = cudaPackages.cudatoolkit;
+      in
+        cudaPackages.backendStdenv.mkDerivation {
+          name = "cuda";
+          src = ./main.cu;
+          unpackPhase = "true";
+          buildInputs = [
             cudatoolkit
             cudaPackages.cuda_cudart
-          linuxPackages.nvidia_x11
           ];
-        LD_LIBRARY_PATH = "${pkgs.linuxPackages.nvidia_x11}/lib";
+          nativeBuildInputs = [
+            cudatoolkit
+            pkgs.autoAddDriverRunpath
+          ];
+          LD_LIBRARY_PATH = "${cudatoolkit}/lib:${cudaPackages.cuda_cudart}/lib";
           buildPhase = ''
-          nvcc -o main main.cu
+            echo "GCC Version:"
+            gcc --version
+            echo "NVCC Version:"
+            nvcc --version
+
+            echo "Building CUDA program..."
+            nvcc -arch=sm_89 -o main $src
             mkdir -p $out/bin
-          mv main $out/bin/cuda-kernel
+            cp main $out/bin/
           '';
+          meta = {
+            mainProgram = "main";
+            platforms = ["x86_64-linux"];
+          };
         };
       default = self.packages."${system}".cuda-kernel;
     };

main.cu

@@ -1,13 +1,13 @@
-#include <unistd.h>
 #include <iostream>
-
+#include "cuda.h"
 
 int main() {
-
+  size_t free_t, total_t;
-    size_t mf, ma;
+  cudaError_t err;
-    cudaMemGetInfo(&mf, &ma);
+  err = cudaMemGetInfo(&free_t, &total_t);
-    std::cout << "Free memory (mb): " << mf/1024/1024 << std::endl;
+  if (err != cudaSuccess) { printf("cudaMalloc d_steps_arr error: %s\n", cudaGetErrorString(err)); return 1; }
-    std::cout << "Total memory (mb): " << ma/1024/1024 << std::endl;
+  std::cout << "Free mem: " << free_t / (1024 * 1024) << " MB Total mem: " << total_t / (1024 * 1024) << " MB" << std::endl;
-
+  std::cout << "Free mem: " << free_t / (1024 * 1024 * 1024) << " GB Total mem: " << total_t / (1024 * 1024 * 1024) << " GB" << std::endl;
   return 0;
 }
+