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Guide to Nix for KoboldCpp

  • KoboldCpp is available on Nixpkgs and can be installed by adding just koboldcpp to your environment.systemPackages (or it can also be placed in home.packages).

KoboldCpp Nix - CUDA Support

In order to enable NVIDIA CUDA support, you'll need to configure several settings:

  • Enable required options:
nixpkgs.config.allowUnfree = true;    # Allow proprietary software
nixpkgs.config.cudaSupport = true;    # Enable CUDA functionality
  • Set your GPU architecture:
nixpkgs.config.cudaCapabilities = [ "sm_75" ];  # Example for RTX 2080

To find your GPU's architecture code:

  1. Visit the NVIDIA Architecture Guide
  2. Locate your GPU Architecture
  3. Use the corresponding sm_XX code in your configuration

Hardware Support

  • ✅ Vulkan: Enabled by default on Linux
  • ✅ Metal: Enabled by default on macOS
  • ❌ ROCm: Not currently available

Example KoboldCpp Nix Configuration

nixpkgs.config = {
  allowUnfree = true;
  cudaSupport = true;
  cudaCapabilities = [ "sm_75" ];
};
environment.systemPackages = [ pkgs.koboldcpp ];
# If you're using home-manager to install KoboldCpp
# home.packages = [ pkgs.koboldcpp ];

# You can also just override koboldcpp to add your CUDA architecture:
# environment.systemPackages = [ (koboldcpp.override { cudaArches = ["sm_75"]; }) ]
# or
# home.packages = [ (koboldcpp.override { cudaArches = ["sm_75"]; }) ];

KoboldCpp - Home Manager

The setup for Home Manager is the same as regular Nix, with one exception regarding Home Manager's instance of nixpkgs. By default, Home Manager manages its own isolated instance of nixpkgs, which has two implications:

  1. You can keep your private Home Manager nixpkgs instance and simply repeat your nixpkgs.config in home manager.
  2. You can set home-manager.useGlobalPkgs = true; to copy your module system's nixpkgs instance. This way, you only need to define it in your configuration.nix, and Home Manager will "inherit" this configuration.

Getting Help for KoboldCpp Nix

  • If you face any issues with running KoboldCpp on Nix, please open an issue here