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Efficient Ab-Initio Molecular Dynamic Simulations by Offloading Fast Fourier Transformations to FPGAs
Arjun Ramaswami, Tobias Kenter, Thomas D. Kühne, Christian Plessl
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A large share of today's HPC workloads is used for Ab-Initio Molecular Dynamics (AIMD) simulations, where the interatomic forces are computed on-the-fly by means of accurate electronic structure calculations. They are computationally intensive and thus constitute an interesting application class for energy-efficient hardware accelerators such as FPGAs. In this paper, we investigate the potential of offloading 3D Fast Fourier Transformations (FFTs) as a critical routine of plane-wave-based electronic structure calculations to FPGA and in conjunction demonstrate the tolerance of these simulations to lower precision computations.
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