diff options
| author | Benjamin Hipple <bhipple@protonmail.com> | 2018-10-23 17:33:49 -0400 |
|---|---|---|
| committer | Frederik Rietdijk <freddyrietdijk@fridh.nl> | 2018-12-19 22:05:22 +0100 |
| commit | 6206a342e0c409de25d3573f7f444434ab75d0ed (patch) | |
| tree | 17b3f2fcf1f53a995789917861e5df993bb4b2d6 /doc/languages-frameworks/python.section.md | |
| parent | 65dfc2b272819760f7c7adf848ccff36390c0425 (diff) | |
mkl: include Intel's libiomp.so in the MKL RPM unpack
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.
Diffstat (limited to 'doc/languages-frameworks/python.section.md')
| -rw-r--r-- | doc/languages-frameworks/python.section.md | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/doc/languages-frameworks/python.section.md b/doc/languages-frameworks/python.section.md index 3e4e12665bd0..acd2bf769b0d 100644 --- a/doc/languages-frameworks/python.section.md +++ b/doc/languages-frameworks/python.section.md @@ -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 |