26TH INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY & NUCLEAR PHYSICS (CHEP2023)

Performance Portability with Compiler Directives for Lattice QCD in the Exascale Era

May 8, 2023, 12:00 PM

15m

Marriott Ballroom VII (Norfolk Waterside Marriott)

Oral Track 10 - Exascale Science Track X - Exascale Science, Heterogeneous Computing and Accelerators, and Quantum Computing

Speaker

Lin, Meifeng (Brookhaven National Laboratory)

Description

The upcoming exascale computers in the United States and elsewhere will have diverse node architectures, with or without compute accelerators, making it a challenge to maintain a code base that is performance portable across different systems. As part of the US Exascale Computing Project (ECP), the USQCD collaboration has embarked on a collaborative effort to prepare the lattice QCD software suites for exascale, with a particular focus on achieving performance portability across diverse exascale architectures.

In this presentation, I will focus on efforts to use compiler directives, OpenMP and OpenACC, to port the Grid C++ lattice QCD library to AMD/Intel/NVIDIA GPUs and multi/many-core CPUs. Performance comparisons with architecture-native implementations in HIP, SYCL and CUDA will be given. I will also discuss the problems encountered and pros and cons of using compiler directives for performance portability.

Presentation materials

MeifengLin_LQCD_CHEP2023.pdf