diff options
| author | Pauli Virtanen <pav@iki.fi> | 2019-12-01 15:41:25 +0200 |
|---|---|---|
| committer | Pauli Virtanen <pav@iki.fi> | 2019-12-01 15:41:25 +0200 |
| commit | 3892cad45c6318a5828ea2a80c896ac648c293fc (patch) | |
| tree | 216ed30c8bf98731b21f42d0d994d083c3f94eb8 /doc | |
| parent | 33a2fcb4aebba8f80fdf12a7ecef879a3aaa0e63 (diff) | |
| download | numpy-3892cad45c6318a5828ea2a80c896ac648c293fc.tar.gz | |
DOC: document NPY_USE_BLAS64_ environment variable
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/source/user/building.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/doc/source/user/building.rst b/doc/source/user/building.rst index b4b4371e5..8e2b5c03b 100644 --- a/doc/source/user/building.rst +++ b/doc/source/user/building.rst @@ -195,6 +195,25 @@ or:: BLAS=None LAPACK=None ATLAS=None python setup.py build +64-bit BLAS and LAPACK with symbol suffix +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Numpy also supports 64-bit OpenBLAS with ``64_`` symbol suffix. Such +library is obtained by compiling OpenBLAS with settings:: + + make INTERFACE64=1 SYMBOLSUFFIX=64_ + +To make Numpy use it, set ``NPY_USE_BLAS64_=1`` environment variable +when building Numpy. You may also need to configure the +``[openblas64_]`` section in ``site.cfg``. + +The symbol suffix avoids symbol name clashes between 32-bit and 64-bit +BLAS/LAPACK libraries, meaning that you can link to both in the same +program. This avoids potential issues when using 64-bit BLAS/LAPACK in +Numpy while simultaneously using other Python software that uses the +32-bit versions. + + Supplying additional compiler flags ----------------------------------- |