Evaluating Performance Portability of OpenMP for SNAP on NVIDIA, Intel, and AMD GPUs Using the Roofline Methodology
TimeFriday, 13 November 20201pm - 1:25pm EDT
DescriptionIn this paper, we show that OpenMP 4.5-based implementation of TestSNAP, a proxy-app for the Spectral Neighbor Analysis Potential (SNAP) in LAMMPS, can be ported across the NVIDIA, Intel and AMD GPUs. Roofline analysis is employed to asses the performance of TestSNAP on each of the architectures. The main contributions of this paper are two-fold: provide OpenMP as a viable option for application portability across multiple GPU architectures, and provide a methodology based on the roofline analysis to determine the performance portability of OpenMP implementations on the target architectures. The GPUs used for this work are Intel Gen9, AMD Radeon Instinct MI60, and NVIDIA Volta V100.