Evaluation of the Intel Xeon Phi offload runtimes for domain decomposition solvers. (November 2018)

• Record Type: Journal Article
• Authors: Maly, Lukas; Zapletal, Jan; Merta, Michal; Riha, Lubomir; Vondrak, Vit
• Is Part Of: Advances in engineering software. Volume 125(2018)
• Page Start: 146
• Page End: 154
• Publication Date: 2018-11
• Subjects: Intel Xeon Phi -- Coprocessor -- Many-core -- Offload -- Domain decomposition; Computer-aided engineering -- Periodicals; Engineering -- Computer programs -- Periodicals; Engineering -- Software -- Periodicals; Periodicals; 620.0028553
• DOI: 10.1016/j.advengsoft.2018.06.011
• Languages: English
• ISSNs: 0965-9978

Abstract

Highlights: Performance and ease of use of various Xeon Phi offload runtimes have been tested. Simple load-balancing strategy is employed to decrease the processing time. Provided graphs and tables illustrate the performance of individual approaches. Abstract: In the paper we provide a comparison of several runtimes which can be used for offloading computationally intensive kernels to the Intel Xeon Phi coprocessors. The presented benchmark application is a stripped-down version of an iterative solver used within the Schur complement finite or boundary element tearing and interconnecting (FETI, BETI) domain decomposition methods where the sparse solve with local stiffness matrices is replaced by the multiplication with dense matrices in order to exploit coalesced memory access patterns. We present offload approaches based on the Intel Language Extension for Offload (LEO), Hetero Streams Library (hStreams), and Heterogeneous Active Messages (HAM), and compare their performance and ease of use.