OpenBLAS Extensions

• BLAS-like extensions

Routine	Data Types	Description
?gemm3m	c,z	gemm3m
?imatcopy	s,d,c,z	in-place transpositon/copying
?omatcopy	s,d,c,z	out-of-place transpositon/copying
?geadd	s,d,c,z	matrix add

• LAPACK-like extensions

  • SHGEMM half-precision GEMM taking bfloat16 arguments

  NOTE the SH... naming scheme has been agreed on with Jack Dongarra of netlib

• Utility functions

  • openblas_get_num_threads
  • openblas_set_num_threads
  • int openblas_get_num_procs(void) returns the number of processors available on the system (may include "hyperthreading cores")
  • int openblas_get_parallel(void) returns 0 for sequential use, 1 for platform-based threading and 2 for OpenMP-based threading
  • char * openblas_get_config() returns something like NO_LAPACKE DYNAMIC_ARCH NO_AFFINITY Haswell
  • int openblas_set_affinity(int thread_index, size_t cpusetsize, cpu_set_t *cpuset) sets the cpu affinity mask of the given thread to the provided cpuset. (Only available under Linux, with semantics identical to pthread_setaffinity_np)