Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content

Cluster FFT Interface

To use the cluster FFT functions, you need to
access the module
through the "
" statement
The Fortran interface provides a derived type
; a number of named constants representing various names of configuration parameters and their possible values; and a number of overloaded functions through the generic functionality of Fortran 95.
To provide communication between parallel processes through MPI, the following include statement must be present in your code:
  • Fortran:
    INCLUDE "mpif.h"
    (for some MPI versions,
    header may be used instead).
There are three main categories of the cluster FFT functions in
Intel® MKL
  1. Descriptor Manipulation
    . There are three functions in this category. The
    function creates an FFT descriptor whose storage is allocated dynamically. The
    function "commits" the descriptor to all its settings. The
    function frees up the memory allocated for the descriptor.
  2. FFT Computation
    . There are two functions in this category. The
    function performs the forward FFT computation, and the
    function performs the backward FFT computation.
  3. Descriptor Configuration
    . There are two functions in this category. The
    function sets one specific configuration value to one of the many configuration parameters. The
    function gets the current value of any of these configuration parameters, all of which are readable. These parameters, though many, are handled one at a time.

Product and Performance Information


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