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There are many different versions of the `cudatoolkit` and related
cuda packages, and it can be tricky to ensure they remain compatible.
- `cudaPackages` is now a package set with `cudatoolkit`, `cudnn`, `cutensor`, `nccl`, as well as `cudatoolkit` split into smaller packages ("redist");
- expressions should now use `cudaPackages` as parameter instead of the individual cuda packages;
- `makeScope` is now used, so it is possible to use `.overrideScope'` to set e.g. a different `cudnn` version;
- `release-cuda.nix` is introduced to easily evaluate cuda packages using hydra.
35 lines
1.2 KiB
Markdown
35 lines
1.2 KiB
Markdown
# CUDA {#cuda}
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CUDA-only packages are stored in the `cudaPackages` packages set. This set
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includes the `cudatoolkit`, portions of the toolkit in separate derivations,
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`cudnn`, `cutensor` and `nccl`.
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A package set is available for each CUDA version, so for example
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`cudaPackages_11_6`. Within each set is a matching version of the above listed
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packages. Additionally, other versions of the packages that are packaged and
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compatible are available as well. For example, there can be a
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`cudaPackages.cudnn_8_3_2` package.
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To use one or more CUDA packages in an expression, give the expression a `cudaPackages` parameter, and in case CUDA is optional
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```nix
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cudaSupport ? false
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cudaPackages ? {}
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```
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When using `callPackage`, you can choose to pass in a different variant, e.g.
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when a different version of the toolkit suffices
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```nix
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mypkg = callPackage { cudaPackages = cudaPackages_11_5; }
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```
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If another version of say `cudnn` or `cutensor` is needed, you can override the
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package set to make it the default. This guarantees you get a consistent package
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set.
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```nix
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mypkg = let
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cudaPackages = cudaPackages_11_5.overrideScope' (final: prev {
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cudnn = prev.cudnn_8_3_2;
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}});
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in callPackage { inherit cudaPackages; };
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```
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