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doc/overlays.xml: update documentation for BLAS/LAPACK

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This expands the documentation and explains how to assert LP64.
This commit is contained in:
Matthew Bauer
2020-04-21 11:03:10 -05:00
parent 8f58fa044d
commit 3c41d61514
2 changed files with 42 additions and 27 deletions
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29
doc/languages-frameworks/python.section.md
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@@ -1290,32 +1290,9 @@ self: super: {
### How to use Intel's MKL with numpy and scipy?
A `site.cfg` is created that configures BLAS based on the `blas` parameter of
the `numpy` derivation. By passing in `mkl`, `numpy` and packages depending on
`numpy` will be built with `mkl`.
The following is an overlay that configures `numpy` to use `mkl`:
```nix
self: super: {
python37 = super.python37.override {
packageOverrides = python-self: python-super: {
numpy = python-super.numpy.override {
blas = super.pkgs.mkl;
};
};
};
}
```
`mkl` requires an `openmp` implementation when running with multiple processors.
By default, `mkl` will use Intel's `iomp` implementation if no other is
specified, but this is a runtime-only dependency and binary compatible with the
LLVM implementation. To use that one instead, Intel recommends users set it with
`LD_PRELOAD`.
Note that `mkl` is only available on `x86_64-{linux,darwin}` platforms;
moreover, Hydra is not building and distributing pre-compiled binaries using it.
MKL can be configured using an overlay. See the section “[Using
overlays to configure
alternatives](#sec-overlays-alternatives-blas-lapack)”.
### What inputs do `setup_requires`, `install_requires` and `tests_require` map to?