Leveraging GPUs in Ab Initio Nuclear Physics Calculations

This paper describes initial steps to leverage accelerators, such as GPUs, in ab initio nuclear physics calculations. Specifically, parallel nuclear structure calculations performed by the MFDn package are considered with selected stages adapted for GPUs. This paper outlines the necessary steps to make MFDn utilize GPUs in its matrix construction stage. The experiments are presented to compare the multithreaded CPU-based version of this phase with the newly designed GPU-based version. Four-to ten-fold speedups were observed for the code executing on GPUs.