Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

mkl_set_num_stripes

Specifies the number of partitions along the leading dimension of the output matrix for parallel
?gemm
 functions.

Syntax

void mkl_set_num_stripes
(
int
ns
)
;
Include Files
  • mkl.h
Input Parameters
Name
Type
Description
ns
int
ns
 > 0 - Specifies the number of partitions to use.
ns
= 0 - Instructs
Intel® oneAPI Math Kernel Library
 to use the default partitioning algorithm.
ns
 < 0 - Invalid value; ignored.
Description
This function enables you to specify the number of stripes, or partitions along the leading dimension of the output matrix, for parallel
?gemm
functions. If this number is not set (default) or if it is set to zero,
Intel® oneAPI Math Kernel Library
?gemm
 functions use the default partitioning algorithm. The specified number of partitions only applies to
?gemm
 functions.
The number specified is a hint, and
Intel® oneAPI Math Kernel Library
 may actually use a smaller number.
This function takes precedence over the
MKL_NUM_STRIPES
 environment variable.

Example

#include "mkl.h"
…
mkl_set_num_stripes(4);
dgemm(...);	 // Intel MKL uses up to 4 stripes for dgemm

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.