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mkl: include Intel's libiomp.so in the MKL RPM unpack

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Since Intel's default openmp implementation is available in the same src
tarball, we can just include it in the package. This means that `mkl` now "just
works" without any environment variables, fragile setup-hooks, or forced
propagation.

Since the openmp implementation is only needed at runtime (and for test cases),
users can substitute a different one if they prefer by exporting it with
`LD_PRELOAD`, which is how Intel recommends handling this. If they do not do so,
`libiomp.so` lives next to `libmkl_rt.so` and thus will be in the RPATH as a
sane default.

Since this still comes from the same src tarball, we can ship it without losing
the fixed-output derivation; likewise, since Hydra is not building or caching
these, shipping these proprietary packages costs no bandwidth for the nix
community.
This commit is contained in:
Benjamin Hipple 2018-10-23 17:33:49 -04:00 • committed by Frederik Rietdijk
parent 65dfc2b272
commit 6206a342e0
4 changed files with 25 additions and 30 deletions
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11
doc/languages-frameworks/python.section.md
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@ -1104,7 +1104,7 @@ on `numpy` will be built with `mkl`.
The following is an overlay that configures `numpy` to use `mkl`:
```nix
self: super: {
python36 = super.python36.override {
python37 = super.python37.override {
packageOverrides = python-self: python-super: {
numpy = python-super.numpy.override {
blas = super.pkgs.mkl;
@ -1114,6 +1114,15 @@ self: super: {
}
```
`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.
## Contributing
### Contributing guidelines