https://www.intel.com/content/www/us/en/docs/onemkl/developer-reference-c/2024-2/mkl-cspblas-bsrsymv.html
mkl_cspblas_?bsrsymv
Computes matrix-vector product of a sparse symmetrical matrix stored in the BSR format (3-arrays variation) with zero-based indexing (deprecated).
mkl