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BLD: Allow users to specify BLAS and LAPACK library link order #13132

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Merged
merged 7 commits into from
May 1, 2019
Merged

BLD: Allow users to specify BLAS and LAPACK library link order #13132

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ed6611d
ENH: allowed external users to select BLAS and LAPACK library link order
zerothi Mar 15, 2019
aa144f3
ENH: amended documentation and changed env-vars as suggested
zerothi Mar 18, 2019
146a174
BUG: ensured that warnings/errors are raised when nothing is requested
zerothi Mar 18, 2019
74a7808
BUG: fixed lapack_lite sources
zerothi Mar 18, 2019
6781e1f
MAINT: fixed last issues and questions according to #13132
zerothi Apr 29, 2019
178a53f
BUG: fixed PYTHONOPTIMIZE run
zerothi Apr 29, 2019
995665e
MAINT: fixed several PYTHONOPTIMIZE=2 failures
zerothi Apr 30, 2019
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5 changes: 5 additions & 0 deletions .travis.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,11 @@ matrix:
- python: 3.6
env:
- PYTHONOPTIMIZE=2
- BLAS=None
- LAPACK=None
- ATLAS=None
- NPY_BLAS_ORDER=mkl,blis,openblas,atlas,accelerate,blas
- NPY_LAPACK_ORDER=MKL,OPENBLAS,ATLAS,ACCELERATE,LAPACK
- USE_ASV=1
- python: 3.5
dist: trusty # remove after April 2019
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60 changes: 59 additions & 1 deletion doc/source/user/building.rst
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Expand Up @@ -118,12 +118,70 @@ means that g77 has been used. If libgfortran.so is a dependency, gfortran
has been used. If both are dependencies, this means both have been used, which
is almost always a very bad idea.

Accelerated BLAS/LAPACK libraries
---------------------------------

NumPy searches for optimized linear algebra libraries such as BLAS and LAPACK.
There are specific orders for searching these libraries, as described below.

BLAS
~~~~

The default order for the libraries are:

1. MKL
2. BLIS
3. OpenBLAS
4. ATLAS
5. Accelerate (MacOS)
6. BLAS (NetLIB)


If you wish to build against OpenBLAS but you also have BLIS available one
may predefine the order of searching via the environment variable
``NPY_BLAS_ORDER`` which is a comma-separated list of the above names which
is used to determine what to search for, for instance::

NPY_BLAS_ORDER=ATLAS,blis,openblas,MKL python setup.py build

will prefer to use ATLAS, then BLIS, then OpenBLAS and as a last resort MKL.
If neither of these exists the build will fail (names are compared
lower case).

LAPACK
~~~~~~

The default order for the libraries are:

1. MKL
2. OpenBLAS
3. ATLAS
4. Accelerate (MacOS)
5. LAPACK (NetLIB)


If you wish to build against OpenBLAS but you also have MKL available one
may predefine the order of searching via the environment variable
``NPY_LAPACK_ORDER`` which is a comma-separated list of the above names,
for instance::

NPY_LAPACK_ORDER=ATLAS,openblas,MKL python setup.py build

will prefer to use ATLAS, then OpenBLAS and as a last resort MKL.
If neither of these exists the build will fail (names are compared
lower case).


Disabling ATLAS and other accelerated libraries
-----------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Usage of ATLAS and other accelerated libraries in NumPy can be disabled
via::

NPY_BLAS_ORDER= NPY_LAPACK_ORDER= python setup.py build

or::

BLAS=None LAPACK=None ATLAS=None python setup.py build


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