Accelerating Ab Initio Nuclear Physics Calculations with GPUs

This paper describes some applications of GPU acceleration in ab initio nu-clear structure calculations. Specifically, we discuss GPU acceleration of the software package MFDn, a parallel nuclear structure eigensolver. We modify the matrix construction stage to run partly on the GPU. On the Titan su-percomputer at the Oak Ridge Leadership Computing Facility, this produces a speedup of approximately 2.2x – 2.7x for the matrix construction stage and 1.2x – 1.4x for the entire run