4. AOCL-Sparse#

AOCL-Sparse provides multi-thread support for specific APIs through OpenMP by default. Setting the total number of threads :

• AOCLSPARSE_NUM_THREADS (recommended)

• OMP_NUM_THREADS

• If both environment variables are set, AOCLSPARSE_NUM_THREADS has higher preference.

• If neither variable is set, the default number of threads is equal to the number of processors identified by the OpenMP library.

• The functions with multi-thread support include SpMV variants, Sp2M, SpMM, SpAdd (with version 5.0) and TRSM.

Tuning and Optimizations:

• AOCL-Sparse provides hint and optimize framework to accelerate the supported functions (at present SpMV) by a prior matrix analysis based on the users’ hints.

• AOCL-Sparse can be built with AVX512 code path enabled for certain APIs. However, we recommend using AVX2 code path (enabled by default) for best performance on Genoa.