Fast Fourier Transforms (FFT)

FFTs for Multiple Needs

FFT functions in one, two, or three dimensions with support for mixed radices (not limited to sizes that are powers of 2). Distributed versions of these FFT functions are used on clusters. Supported functions include:

  • One-dimensional versions in single and double precision
  • Multidimensional, complex-to-complex, real-to-complex, and real-to-real transforms of arbitrary length
  • FFTW interfaces for compatibility with industry-standard APIs

Fourier Transform Functions for Clusters

When single-node performance is insufficient, get support for distributed computation across a cluster of compute nodes.

benchmark of performance on an Intel Xeon Phi processor

See below for further notes and disclaimers.1


FFT Performance Boost Benchmark

Make informed decisions regarding which functions to use in your applications, comparing the performance of Intel® Math Kernel Library to FFTW.

Additional Features


1 Benchmark results were obtained prior to implementation of recent software patches and firmware updates that are intended to address exploits referred to as "Spectre" and "Meltdown." Implementation of these updates may make these results inapplicable to your device or system.

Software and workloads used in performance tests may have been optimized for performance only on Intel® microprocessors. Performance tests, such as SYSmark and MobileMark, are measured using specific computer systems, components, software, operations, and functions. Any change to any of those factors may cause the results to vary. You should consult other information and performance tests to assist you in fully evaluating your contemplated purchases, including the performance of that product when combined with other products. For more complete information, visit

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