Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 0.10
  • 10/21/2020
  • Public Content
Contents

mkl_get_clocks_frequency

Returns the frequency value in GHz based on constant-rate Time Stamp Counter.

Syntax

double
mkl_get_clocks_frequency
(
void
);
Include Files
  • mkl.h
Description
The function
mkl_get_clocks_frequency
 returns the CPU frequency value (in GHz) based on constant-rate Time Stamp Counter (TSC). Use of the constant-rate TSC ensures that each clock tick is constant even if the CPU frequency changes. Therefore, the returned frequency is constant.
Obtaining the frequency may take some time when
mkl_get_clocks_frequency
 is called for the first time. The same holds for functions
second/dsecnd
, which call
mkl_get_clocks_frequency
.
Return Values
Name
Type
Description
freq
double
Frequency value in GHz

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804