Hybrid-parallel sparse matrix-vector multiplication with explicit communication overlap on current multicore-based systems.

Hager G, Wellein G, Schubert G, Fehske H (2011)

Publication Type: Journal article

Publication year: 2011

Journal

Parallel Processing Letters World Scientific Publishing Co

Publisher: World Scientific Publishing Co

Book Volume: 21

Pages Range: 339-358

Journal Issue: 3

DOI: 10.1142/S0129626411000254

Abstract

We evaluate optimized parallel sparse matrix-vector operations for several representative application areas on widespread multicore-based cluster configurations. First the single-socket baseline performance is analyzed and modeled with respect to basic architectural properties of standard multicore chips. Beyond the single node, the performance of parallel sparse matrix-vector operations is often limited by communication overhead. Starting from the observation that nonblocking MPI is not able to hide communication cost using standard MPI implementations, we demonstrate that explicit overlap of communication and computation can be achieved by using a dedicated communication thread, which may run on a virtual core. Moreover we identify performance benefits of hybrid MPI/OpenMP programming due to improved load balancing even without explicit communication overlap. We compare performance results for pure MPI, the widely used "vector-like" hybrid programming strategies, and explicit overlap on a modern multicore-based cluster and a Cray XE6 system. © 2011 World Scientific Publishing Company.

Authors with CRIS profile

Georg Hager Regionales Rechenzentrum Erlangen (RRZE) Gerhard Wellein Professur für Höchstleistungsrechnen

Involved external institutions

Universität Greifswald DE Germany (DE)

How to cite

APA:

Hager, G., Wellein, G., Schubert, G., & Fehske, H. (2011). Hybrid-parallel sparse matrix-vector multiplication with explicit communication overlap on current multicore-based systems. Parallel Processing Letters, 21(3), 339-358. https://dx.doi.org/10.1142/S0129626411000254

MLA:

Hager, Georg, et al. "Hybrid-parallel sparse matrix-vector multiplication with explicit communication overlap on current multicore-based systems." Parallel Processing Letters 21.3 (2011): 339-358.

BibTeX: Download