ECSS Symposium June 19 2012: P3DFFT Introduction - Pekurovsky

Fourier and related types of transforms are widely used in scientific community. Three-dimensional Fast Fourier Transforms (3D FFT), for example, are used in many areas such as DNS turbulence, astrophysics, material science, chemistry, oceanography and X-ray crystallography. In many cases this is a very compute-intensive operation. Lately there has been a need for implementations of 3D FFT and related algorithms with good scaling on Petascale parallel machines. Most existing implementations of 3D FFT use one-dimensional task decomposition, and therefore are subject to scaling limitation when the number of cores reaches domain size. P3DFFT library overcomes this limitation. It is an open-source, easy-to-use software package providing general solution for 3D FFT based on two-dimensional decomposition. In this way it is different from majority of other libraries such as FFTW, PESSL, MKL and ACML. In this talk we will discuss what P3DFFT does, its evolution, and scaling on sub-petascale platforms.

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