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An MPI/OpenACC implementation of a high-order electromagnetics solver with GPUDirect communication
KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Parallelldatorcentrum, PDC. KTH, Centra, SeRC - Swedish e-Science Research Centre.ORCID-id: 0000-0002-3859-9480
Vise andre og tillknytning
2016 (engelsk)Inngår i: The international journal of high performance computing applications, ISSN 1094-3420, E-ISSN 1741-2846, Vol. 30, nr 3, s. 320-334Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We present performance results and an analysis of a message passing interface (MPI)/OpenACC implementation of an electromagnetic solver based on a spectral-element discontinuous Galerkin discretization of the time-dependent Maxwell equations. The OpenACC implementation covers all solution routines, including a highly tuned element-by-element operator evaluation and a GPUDirect gather-scatter kernel to effect nearest neighbor flux exchanges. Modifications are designed to make effective use of vectorization, streaming, and data management. Performance results using up to 16,384 graphics processing units of the Cray XK7 supercomputer Titan show more than 2.5x speedup over central processing unit-only performance on the same number of nodes (262,144 MPI ranks) for problem sizes of up to 6.9 billion grid points. We discuss performance-enhancement strategies and the overall potential of GPU-based computing for this class of problems.

sted, utgiver, år, opplag, sider
Sage Publications, 2016. Vol. 30, nr 3, s. 320-334
Emneord [en]
Hybrid MPI, OpenACC, GPUDirect, spectral element-discontinuous Galerkin
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-194020DOI: 10.1177/1094342015626584ISI: 000382958000005Scopus ID: 2-s2.0-84983414976OAI: oai:DiVA.org:kth-194020DiVA, id: diva2:1037621
Forskningsfinansiär
Swedish e‐Science Research Center
Merknad

QC 20161017

Tilgjengelig fra: 2016-10-17 Laget: 2016-10-14 Sist oppdatert: 2018-01-14bibliografisk kontrollert

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