Parallel FFTs 3d FFT is 3 sets of 1d FFTs
{"Image DocumentName": "Parallel FFTs 3d FFT is 3 sets of 1d FFTs", "Image ImageDescription": "in parallel, 3d grid is distributed across procs. perform 1d FFTs on-processor. native library or FFTW (www.fftw.org) 1d FFTs, transpose, 1d FFTs, transpose, ... transpose = data transfer. transfer of entire grid is costly. FFTs for PPPM can scale poorly. on large # of procs and on clusters. Good news: Cost of PPPM is only ~2x more than 8-10 Angstrom cutoff.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}