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Run time (i.e., minimal wall-clock time in ms) measurement of a single-precision 2D squared complex-to-complex out-of-place Fourier transform of FFTW, clFFT, and cuFFT libraries. clFFT and cuFFT benchmarks were obtained for NVIDIA GeForce Titan Black; the FFTW benchmark was obtained for Intel Xeon E5-2650 utilizing 8 threads. FFTW is initialized with FFTW_MEASURE. The clFFT library has only limited support for mixed radix FFTs and achieves good performance for power of 2 FFTs only.
