Hybrid CPU-GPU Generation of the Hamiltonian and Overlap Matrices in FLAPW Methods

  • Diego Fabregat-Traver
  • Davor Davidović
  • Markus Höhnerbach
  • Edoardo Di Napoli
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10164)

Abstract

In this paper we focus on the integration of high-performance numerical libraries in ab initio codes and the portability of performance and scalability. The target of our work is FLEUR, a software for electronic structure calculations developed in the Forschungszentrum Jülich over the course of two decades. The presented work follows up on a previous effort to modernize legacy code by re-engineering and rewriting it in terms of highly optimized libraries. We illustrate how this initial effort to get efficient and portable shared-memory code enables fast porting of the code to emerging heterogeneous architectures. More specifically, we port the code to nodes equipped with multiple GPUs. We divide our study in two parts. First, we show considerable speedups attained by minor and relatively straightforward code changes to off-load parts of the computation to the GPUs. Then, we identify further possible improvements to achieve even higher performance and scalability. On a system consisting of 16-cores and 2 GPUs, we observe speedups of up to 5\(\times \) with respect to our optimized shared-memory code, which in turn means between 7.5\(\times \) and 12.5\(\times \) speedup with respect to the original FLEUR code.

Keywords

DFT High-performance computing Performance portability Heterogeneous architectures FLAPW method FLEUR 

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Diego Fabregat-Traver
    • 1
  • Davor Davidović
    • 2
  • Markus Höhnerbach
    • 1
  • Edoardo Di Napoli
    • 1
    • 3
    • 4
  1. 1.AICESRWTH AachenAachenGermany
  2. 2.RBIZagrebCroatia
  3. 3.JARA-HPCJülichGermany
  4. 4.Jülich Supercomputing Center, Forschungszentrum JülichJülichGermany

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