NDLI: Assessing One-to-One Parallelism Levels Mapping for OpenMP Offloading to GPUs

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Assessing One-to-One Parallelism Levels Mapping for OpenMP Offloading to GPUs

Content Provider	ACM Digital Library
Author	Khaldi, Dounia Shen, Chen Chapman, Barbara Tian, Xiaonan
Abstract	The proliferation of accelerators in modern clusters makes efficient coprocessor programming a key requirement if application codes are to achieve high levels of performance with acceptable energy consumption on such platforms. This has led to considerable effort to provide suitable programming models for these accelerators, especially within the OpenMP community. While OpenMP 4.5 offers a rich set of directives, clauses and runtime calls to fully utilize accelerators, an efficient implementation of OpenMP 4.5 for GPUs remains a non-trivial task, given their multiple levels of thread parallelism. In this paper, we describe a new implementation of the corresponding features of OpenMP 4.5 for GPUs based on a one-to-one mapping of its loop hierarchy parallelism to the GPU thread hierarchy. We assess the impact of this mapping, in particular the use of GPU warps to handle innermost loop execution, on the performance of GPU execution via a set of benchmarks that include a version of the NAS parallel benchmarks specifically developed for this research; we also used the Matrix-Matrix multiplication, Jacobi, Gauss and Laplacian kernels.
Starting Page	68
Ending Page	73
Page Count	6
File Format	PDF
ISBN	9781450348836
DOI	10.1145/3026937.3026945
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-02-04
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Llvm Openmp Openuh Gpus
Content Type	Text
Resource Type	Article

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