Experiences in porting mini‐applications to OpenACC and OpenMP on heterogeneous systems. (24th April 2020)

• Record Type: Journal Article
• Authors: Vergara Larrea, Verónica G.; Budiardja, Reuben D.; Gayatri, Rahulkumar; Daley, Christopher; Hernandez, Oscar; Joubert, Wayne
• Other Names: Gil‐Costa Veronica guestEditor.; Senger Hermes guestEditor.; Robinson Timothy W. guestEditor.; Thota Abhinav guestEditor.
• Is Part Of: Concurrency and computation. Volume 32:Number 20(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-04-24
• Subjects: mini‐applications -- OpenACC -- OpenMP -- performance evaluation; Parallel processing (Electronic computers) -- Periodicals; Parallel computers -- Periodicals; 004.35
• DOI: 10.1002/cpe.5780
• Languages: English
• ISSNs: 1532-0626

Abstract

Summary: This article studies mini‐applications—Minisweep, GenASiS, GPP, and FF—that use computational methods commonly encountered in HPC. We have ported these applications to develop OpenACC and OpenMP versions, and evaluated their performance on Titan (Cray XK7 with K20x GPUs), Cori (Cray XC40 with Intel KNL), Summit (IBM AC922 with Volta GPUs), and Cori‐GPU (Cray CS‐Storm 500NX with Intel Skylake and Volta GPUs). Our goals are for these new ports to be useful to both application and compiler developers, to document and describe the lessons learned and the methodology to create optimized OpenMP and OpenACC versions, and to provide a description of possible migration paths between the two specifications. Cases where specific directives or code patterns result in improved performance for a given architecture are highlighted. We also include discussions of the functionality and maturity of the latest compilers available on the above platforms with respect to OpenACC or OpenMP implementations.