Returns full precision elapsed CPU clocks.
Syntax
Fortran:
call mkl_get_cpu_clocks( clocks )
C:
mkl_get_cpu_clocks( &clocks );
Include Files
The FORTRAN 77 interface is specified in the mkl_service.fi include file and the C interface is specified in the mkl_service.h include file.
Output Parameters
Name |
Type |
Description |
|---|---|---|
clocks |
FORTRAN: INTEGER*8 C: unsigned MKL_INT64 |
Elapsed CPU clocks |
Description
The mkl_get_cpu_clocks function returns the elapsed CPU clocks.
This may be useful when timing short intervals with high resolution. The mkl_get_cpu_clocks function is also applied in pairs like second/dsecnd. Note that out-of-order code execution on IA-32 or Intel® 64 architecture processors may disturb the exact elapsed CPU clocks value a little bit, which may be important while measuring extremely short time intervals.
Note
getcpuclocks is an obsolete name for the mkl_get_cpu_clocks function that is referenced in the library for back compatibility purposes but is deprecated and subject to removal in subsequent releases.
Optimization Notice |
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The Intel® Math Kernel Library (Intel® MKL) contains functions that are more highly optimized for Intel microprocessors than for other microprocessors. While the functions in Intel® MKL offer optimizations for both Intel and Intel-compatible microprocessors, depending on your code and other factors, you will likely get extra performance on Intel microprocessors. While the paragraph above describes the basic optimization approach for Intel® MKL as a whole, the library may or may not be optimized to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include Intel® Streaming SIMD Extensions 2 (Intel® SSE2), Intel® Streaming SIMD Extensions 3 (Intel® SSE3), and Supplemental Streaming SIMD Extensions 3 (Intel® 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. Intel recommends that you evaluate other library products to determine which best meets your requirements. |