NDLI: Safe limits on voltage reduction efficiency in GPUs: a direct measurement approach

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Safe limits on voltage reduction efficiency in GPUs: a direct measurement approach

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Safe limits on voltage reduction efficiency in GPUs: a direct measurement approach

Content Provider	ACM Digital Library
Author	Bose, Pradip Bertran, Ramon Reddi, Vijay Janapa Buyuktosunoglu, Alper Leng, Jingwen
Abstract	Energy efficiency of GPU architectures has emerged as an important aspect of computer system design. In this paper, we explore the energy benefits of reducing the GPU chip's voltage to the safe limit, i.e. $V_{min}$ point. We perform such a study on several commercial off-the-shelf GPU cards. We find that there exists about 20% voltage guardband on those GPUs spanning two architectural generations, which, if "eliminated" completely, can result in up to 25% energy savings on one of the studied GPU cards. The exact improvement magnitude depends on the program's available guardband, because our measurement results unveil a program dependent $V_{min}$ behavior across the studied programs. We make fundamental observations about the program-dependent $V_{min}$ behavior. We experimentally determine that the voltage noise has a larger impact on $V_{min}$ compared to the process and temperature variation, and the activities during the kernel execution cause large voltage droops. From these findings, we show how to use a kernel's microarchitectural performance counters to predict its $V_{min}$ value accurately. The average and maximum prediction errors are 0.5% and 3%, respectively. The accurate $V_{min}$ prediction opens up new possibilities of a cross-layer dynamic guardbanding scheme for GPUs, in which software predicts and manages the voltage guardband, while the functional correctness is ensured by a hardware safety net mechanism.
Starting Page	294
Ending Page	307
Page Count	14
File Format	PDF
ISBN	9781450340342
DOI	10.1145/2830772.2830811
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-12-05
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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