NDLI: Heterogeneous microarchitectures trump voltage scaling for low-power cores

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Heterogeneous microarchitectures trump voltage scaling for low-power cores

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Heterogeneous microarchitectures trump voltage scaling for low-power cores

Content Provider	ACM Digital Library
Author	Wenisch, Thomas F. Das, Reetuparna Padmanabha, Shruti Lukefahr, Andrew Dreslinski, Ronald Mahlke, Scott
Abstract	Heterogeneous architectures offer many potential avenues for improving energy efficiency in today's low-power cores. Two common approaches are dynamic voltage/frequency scaling (DVFS) and heterogeneous microarchitectures (HMs). Traditionally both approaches have incurred large switching overheads, which limit their applicability to coarse-grain program phases. However, recent research has demonstrated low-overhead mechanisms that enable switching at granularities as low as 1K instructions. The question remains, in this fine-grained switching regime, which form of heterogeneity offers better energy efficiency for a given level of performance? The effectiveness of these techniques depend critically on both efficient architectural implementation and accurate scheduling to maximize energy efficiency for a given level of performance. Therefore, we develop PaTH, an offline analysis tool, to compute (near-)optimal schedules, allowing us to determine Pareto-optimal energy savings for a given architecture. We leverage PaTH to study the potential energy efficiency of fine-grained DVFS and HMs, as well as a hybrid approach. We show that HMs achieve higher energy savings than DVFS for a given level of performance. While at a coarse granularity the combination of DVFS and HMs still proves beneficial, for fine-grained scheduling their combination makes little sense as HMs alone provide the bulk of the energy efficiency.
Starting Page	237
Ending Page	250
Page Count	14
File Format	PDF
ISBN	9781450328098
DOI	10.1145/2628071.2628078
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-08-24
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Fine-grained architectures Heterogeneous multicores Energy efficiency Dvfs
Content Type	Text
Resource Type	Article

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