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Wellposed®

About hOpenBLAS

hOpenBLAS is an open source component of the Wellposed® mathematical software suite.

Members of the numerical haskell open source community can be found on irc at #numerical-haskell on freenode, and via the numericalhaskell mailing list.

Build Status

hOpenBLAS is a self contained full (well, not quite yet) BLAS and LAPACK binding that provides the full BLAS and LAPACKE APIs in a simple, unopinionated, Haskell wrapper.

This library is NOT meant to be used by end users, it is designed to be an unopinionated, simple, portable, easy to install BLAS/LAPACK substrate for higher level numerical computing libraries to build upon. Morever, this library is strictly a wrapper, and simply makes using the functionality of OpenBLAS more accessible.

This library is NOT meant to be used a standalone array library (except in desperation), but rather should be used by a higher level numerical array library to provide high performance linear algebra routines.

hOpenBLAS requires having gfortran or another fortran compiler installed in order to build, along with OpenBLAS itself. For now, only OpenBLAS is supported, because it is the only actively maintained BLAS that is multi-threaded and threadsafe by default. Patches to add support for other threadsafe BLAS/LAPACK variants is welcome.

how to install

  • On OS X systems, brew tap homebrew/science ; brew install openblas will handle all the prereqs for using hOpenBLAS.
  • On Linux, BSD, and other unix systems, a dev version of OpenBLAS is often available via the system package manager. NOTE: some linux package managers (i'm looking at you, debian / ubuntu) don't provide a LAPACK built with OpenBLAS. Don't use these packages. Many BLAS / LAPACK variants, including the reference ones and Atlas, aren't threadsafe! OpenBLAS is thread safe, and thus when LAPACK is built using OpenBLAS (as in the standard OpenBLAS build), it is threadsafe too.
  • Otherwise, read the documentation at https://github.com/xianyi/OpenBLAS for how to install on your system. This will typically involve:
git clone https://github.com/xianyi/OpenBLAS ; 
cd OpenBLAS ; 
make ;
make install PREFIX=$yourPrefixHere # eg PREFIX=/usr on linux systems

note that if you plan to deploy applications on multiple machines that have different cpu versions, you may want to build openblas with make DYNAMIC_ARCH=1 NO_SHARED=1 ; make install NO_SHARED=1 PREFIX=$blah and on OSX systems you may want to also pass CC=clang to the build command.

once openblas is installed, hOpenBLAS can be easily installed just like any other haskell library, if your cloned this repo, cabal install will work, otherwise cabal install hOpenBLAS will do the trick.

getting involved

patches, bug reports, and other contributions welcome.