Article

Performance upper bound analysis and optimization of SGEMM on Fermi and Kepler GPUs

Authors:

Andre SeznecAuthors Info & Claims

CGO '13: Proceedings of the 2013 IEEE/ACM International Symposium on Code Generation and Optimization (CGO)

Pages 1 - 10

https://doi.org/10.1109/CGO.2013.6494986

Published: 23 February 2013 Publication History

Abstract

In this paper, we present an approach to estimate GPU applications' performance upper bound based on algorithm analysis and assembly code level benchmarking. As an example, we analyze the potential peak performance of SGEMM (Single-precision General Matrix Multiply) on Fermi (GF110) and Kepler (GK104) GPUs. We try to answer the question of how much optimization space is left for SGEMM and why. According to our analysis, the nature of Fermi (Kepler) instruction set and the limited issue throughput of the schedulers are the main limitation factors for SGEMM to approach the theoretical peak performance. The estimated upper-bound peak performance of SGEMM is around 82.5% of the theoretical peak performance on GTX580 Fermi GPU and 57.6% on GTX680 Kepler GPU. Guided by this analysis and using the native assembly language, on average, our SGEMM implementations achieve about 5% better performance than CUBLAS in CUDA 4.1 SDK for large matrices on GTX580. The achieved performance is around 90% of the estimated upper-bound performance of SGEMM on GTX580. On GTX680, the best performance we achieve is around 77.3% of the estimated performance upper bound. We also describe how to use native assembly language directly in the CUDA runtime source code.

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Performance upper bound analysis and optimization of SGEMM on Fermi and Kepler GPUs

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cover image ACM Conferences

CGO '13: Proceedings of the 2013 IEEE/ACM International Symposium on Code Generation and Optimization (CGO)

February 2013

366 pages

ISBN:9781467355247

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IEEE Computer Society

United States

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Published: 23 February 2013

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https://dl.acm.org/doi/10.1145/3581784.3607077
Rasch ASchulze RShabalin DElster AGorlatch SHall MVerbrugge CLhoták OShen X(2023)(De/Re)-Compositions Expressed Systematically via MDH-Based SchedulesProceedings of the 32nd ACM SIGPLAN International Conference on Compiler Construction10.1145/3578360.3580269(61-72)Online publication date: 17-Feb-2023
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