137ccd9dd9
The wording in some places is not grammatically correct. This change also provides minor adjustments to the Markdown formatting which provide modest improvements to readability.
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Markdown
224 lines
8.4 KiB
Markdown
# OpenBLAS
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[](https://gitter.im/xianyi/OpenBLAS?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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Travis CI: [](https://travis-ci.org/xianyi/OpenBLAS)
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AppVeyor: [](https://ci.appveyor.com/project/xianyi/openblas/branch/develop)
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## Introduction
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OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.
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Please read the documentation on the OpenBLAS wiki pages: <http://github.com/xianyi/OpenBLAS/wiki>.
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## Binary Packages
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We provide official binary packages for the following platform:
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* Windows x86/x86_64
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You can download them from [file hosting on sourceforge.net](https://sourceforge.net/projects/openblas/files/).
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## Installation from Source
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Download from project homepage, http://xianyi.github.com/OpenBLAS/, or check out the code
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using Git from https://github.com/xianyi/OpenBLAS.git.
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### Dependencies
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Building OpenBLAS requires the following to be installed:
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* GNU Make
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* A C compiler, e.g. GCC or Clang
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* A Fortran compiler (optional, for LAPACK)
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* IBM MASS (optional, see below)
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### Normal compile
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Simply invoking `make` (or `gmake` on BSD) will detect the CPU automatically.
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To set a specific target CPU, use `make TARGET=xxx`, e.g. `make TARGET=NEHALEM`.
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The full target list is in the file `TargetList.txt`.
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### Cross compile
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Set `CC` and `FC` to point to the cross toolchains, and set `HOSTCC` to your host C compiler.
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The target must be specified explicitly when cross compiling.
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Examples:
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* On an x86 box, compile this library for a loongson3a CPU:
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```sh
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make BINARY=64 CC=mips64el-unknown-linux-gnu-gcc FC=mips64el-unknown-linux-gnu-gfortran HOSTCC=gcc TARGET=LOONGSON3A
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```
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* On an x86 box, compile this library for a loongson3a CPU with loongcc (based on Open64) compiler:
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```sh
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make CC=loongcc FC=loongf95 HOSTCC=gcc TARGET=LOONGSON3A CROSS=1 CROSS_SUFFIX=mips64el-st-linux-gnu- NO_LAPACKE=1 NO_SHARED=1 BINARY=32
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```
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### Debug version
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A debug version can be built using `make DEBUG=1`.
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### Compile with MASS support on Power CPU (optional)
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The [IBM MASS](http://www-01.ibm.com/software/awdtools/mass/linux/mass-linux.html) library
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consists of a set of mathematical functions for C, C++, and Fortran applications that are
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are tuned for optimum performance on POWER architectures.
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OpenBLAS with MASS requires a 64-bit, little-endian OS on POWER.
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The library can be installed as shown:
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* On Ubuntu:
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```sh
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wget -q http://public.dhe.ibm.com/software/server/POWER/Linux/xl-compiler/eval/ppc64le/ubuntu/public.gpg -O- | sudo apt-key add -
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echo "deb http://public.dhe.ibm.com/software/server/POWER/Linux/xl-compiler/eval/ppc64le/ubuntu/ trusty main" | sudo tee /etc/apt/sources.list.d/ibm-xl-compiler-eval.list
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sudo apt-get update
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sudo apt-get install libxlmass-devel.8.1.5
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```
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* On RHEL/CentOS:
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```sh
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wget http://public.dhe.ibm.com/software/server/POWER/Linux/xl-compiler/eval/ppc64le/rhel7/repodata/repomd.xml.key
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sudo rpm --import repomd.xml.key
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wget http://public.dhe.ibm.com/software/server/POWER/Linux/xl-compiler/eval/ppc64le/rhel7/ibm-xl-compiler-eval.repo
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sudo cp ibm-xl-compiler-eval.repo /etc/yum.repos.d/
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sudo yum install libxlmass-devel.8.1.5
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```
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After installing the MASS library, compile OpenBLAS with `USE_MASS=1`.
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For example, to compile on Power8 with MASS support: `make USE_MASS=1 TARGET=POWER8`.
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### Install to a specific directory (optional)
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Use `PREFIX=` when invoking `make`, for example
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```sh
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make install PREFIX=your_installation_directory
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```
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The default installation directory is `/opt/OpenBLAS`.
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## Supported CPUs and Operating Systems
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Please read `GotoBLAS_01Readme.txt`.
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### Additional supported CPUs
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#### x86/x86-64
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- **Intel Xeon 56xx (Westmere)**: Used GotoBLAS2 Nehalem codes.
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- **Intel Sandy Bridge**: Optimized Level-3 and Level-2 BLAS with AVX on x86-64.
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- **Intel Haswell**: Optimized Level-3 and Level-2 BLAS with AVX2 and FMA on x86-64.
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- **AMD Bobcat**: Used GotoBLAS2 Barcelona codes.
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- **AMD Bulldozer**: x86-64 ?GEMM FMA4 kernels. (Thanks to Werner Saar)
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- **AMD PILEDRIVER**: Uses Bulldozer codes with some optimizations.
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- **AMD STEAMROLLER**: Uses Bulldozer codes with some optimizations.
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#### MIPS64
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- **ICT Loongson 3A**: Optimized Level-3 BLAS and the part of Level-1,2.
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- **ICT Loongson 3B**: Experimental
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#### ARM
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- **ARMv6**: Optimized BLAS for vfpv2 and vfpv3-d16 (e.g. BCM2835, Cortex M0+)
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- **ARMv7**: Optimized BLAS for vfpv3-d32 (e.g. Cortex A8, A9 and A15)
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#### ARM64
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- **ARMv8**: Experimental
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- **ARM Cortex-A57**: Experimental
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#### PPC/PPC64
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- **POWER8**: Optmized Level-3 BLAS and some Level-1, only with `USE_OPENMP=1`
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#### IBM zEnterprise System
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- **Z13**: Optimized Level-3 BLAS and Level-1,2 (double precision)
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### Supported OS
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- **GNU/Linux**
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- **MinGW or Visual Studio (CMake)/Windows**: Please read <https://github.com/xianyi/OpenBLAS/wiki/How-to-use-OpenBLAS-in-Microsoft-Visual-Studio>.
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- **Darwin/macOS**: Experimental. Although GotoBLAS2 supports Darwin, we are not macOS experts.
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- **FreeBSD**: Supported by the community. We don't actively test the library on this OS.
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- **OpenBSD**: Supported by the community. We don't actively test the library on this OS.
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- **DragonFly BSD**: Supported by the community. We don't actively test the library on this OS.
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- **Android**: Supported by the community. Please read <https://github.com/xianyi/OpenBLAS/wiki/How-to-build-OpenBLAS-for-Android>.
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## Usage
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Statically link with `libopenblas.a` or dynamically link with `-lopenblas` if OpenBLAS was
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compiled as a shared library.
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### Setting the number of threads using environment variables
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Environment variables are used to specify a maximum number of threads.
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For example,
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```sh
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export OPENBLAS_NUM_THREADS=4
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export GOTO_NUM_THREADS=4
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export OMP_NUM_THREADS=4
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```
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The priorities are `OPENBLAS_NUM_THREADS` > `GOTO_NUM_THREADS` > `OMP_NUM_THREADS`.
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If you compile this library with `USE_OPENMP=1`, you should set the `OMP_NUM_THREADS`
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environment variable; OpenBLAS ignores `OPENBLAS_NUM_THREADS` and `GOTO_NUM_THREADS` when
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compiled with `USE_OPENMP=1`.
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### Setting the number of threads at runtime
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We provide the following functions to control the number of threads at runtime:
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```c
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void goto_set_num_threads(int num_threads);
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void openblas_set_num_threads(int num_threads);
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```
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If you compile this library with `USE_OPENMP=1`, you should use the above functions too.
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## Reporting bugs
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Please submit an issue in https://github.com/xianyi/OpenBLAS/issues.
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## Contact
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* OpenBLAS users mailing list: https://groups.google.com/forum/#!forum/openblas-users
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* OpenBLAS developers mailing list: https://groups.google.com/forum/#!forum/openblas-dev
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## Change log
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Please see Changelog.txt to view the differences between OpenBLAS and GotoBLAS2 1.13 BSD version.
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## Troubleshooting
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* Please read the [FAQ](https://github.com/xianyi/OpenBLAS/wiki/Faq) first.
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* Please use GCC version 4.6 and above to compile Sandy Bridge AVX kernels on Linux/MinGW/BSD.
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* Please use Clang version 3.1 and above to compile the library on Sandy Bridge microarchitecture.
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Clang 3.0 will generate the wrong AVX binary code.
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* The number of CPUs/cores should less than or equal to 256. On Linux `x86_64` (`amd64`),
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there is experimental support for up to 1024 CPUs/cores and 128 numa nodes if you build
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the library with `BIGNUMA=1`.
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* OpenBLAS does not set processor affinity by default.
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On Linux, you can enable processor affinity by commenting out the line `NO_AFFINITY=1` in
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Makefile.rule. However, note that this may cause
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[a conflict with R parallel](https://stat.ethz.ch/pipermail/r-sig-hpc/2012-April/001348.html).
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* On Loongson 3A, `make test` may fail with a `pthread_create` error (`EAGAIN`).
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However, it will be okay when you run the same test case on the shell.
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## Contributing
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1. [Check for open issues](https://github.com/xianyi/OpenBLAS/issues) or open a fresh issue
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to start a discussion around a feature idea or a bug.
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2. Fork the [OpenBLAS](https://github.com/xianyi/OpenBLAS) repository to start making your changes.
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3. Write a test which shows that the bug was fixed or that the feature works as expected.
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4. Send a pull request. Make sure to add yourself to `CONTRIBUTORS.md`.
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## Donation
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Please read [this wiki page](https://github.com/xianyi/OpenBLAS/wiki/Donation).
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