8310b2d5d3
bli_arch_query_id() is used to select kernels in optimized BLAS APIs. Previous implementation incurred the overhead of multiple function calls. This has been reduced by: - Changing the function to be defined in a header file so it can be inlined. - Avoiding call to bli_arch_check_id_once that was a wrapper for a call to bli_pthread_once. Instead bli_pthread_once is called directly. - For builds with a single BLIS sub-configuration, correct arch_id is taken directly from a header file in the corresponding config subdirectory, avoiding the bli_pthread_once call and making the value explicit at compile time, which may enable additional optimizations. To enable these changes, the variables arch_id and model_id defined in frame/base/bli_arch.c are no longer static, as they must be accessed in multiple files (i.e. they are now global variables). Rename to g_arch_id and g_model_id to distinguish from any locally defined arch_id or model_id variables.
AOCL-BLAS library
AOCL-BLAS is AMD's optimized version of BLAS targeted for AMD EPYC and Ryzen CPUs. It is developed as a forked version of BLIS (https://github.com/flame/blis), which is developed by members of the Science of High-Performance Computing (SHPC) group in the Institute for Computational Engineering and Sciences at The University of Texas at Austin and other collaborators (including AMD). All known features and functionalities of BLIS are retained and supported in AOCL-BLAS library. AOCL-BLAS is regularly updated with the improvements from the upstream repository.
AOCL BLAS is optimized with SSE2, AVX2, AVX512 instruction sets which would be enabled based on the target Zen architecture using the dynamic dispatch feature. All prominent Level 3, Level 2 and Level 1 APIs are designed and optimized for specific paths targeting different size spectrums e.g., Small, Medium and Large sizes. These algorithms are designed and customized to exploit the architectural improvements of the target platform.
For detailed instructions on how to configure, build, install, and link against AOCL-BLAS on AMD CPUs, please refer to the AOCL User Guide located on AMD developer portal.
The upstream repository (https://github.com/flame/blis) contains further information on BLIS, including background information on BLIS design, usage examples, and a complete BLIS API reference.
AOCL-BLAS is developed and maintained by AMD. You can contact us on the email-id toolchainsupport@amd.com. You can also raise any issue/suggestion on the git-hub repository at https://github.com/amd/blis/issues.