Beyond DVFS: A First Look at Performance under a Hardware-Enforced Power Bound

Dynamic Voltage Frequency Scaling (DVFS) has been the tool of choice for balancing power and performance in high-performance computing (HPC). With the introduction of Intel's Sandy Bridge family of processors, researchers now have a far more attractive option: user-specified, dynamic, hardware-...

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Veröffentlicht in:2012 26th IEEE International Parallel and Distributed Processing Symposium Workshops S. 947 - 953
Hauptverfasser: Rountree, B., Ahn, D. H., de Supinski, B. R., Lowenthal, D. K., Schulz, M.
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: IEEE 01.05.2012
Schlagworte:
Benchmark testing
Clamps
Computer architecture
Power bound
Power demand
Power measurement
Program processors
RAPL
Time measurement
ISBN:1467309745, 9781467309745
Online-Zugang:Volltext
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Zusammenfassung:Dynamic Voltage Frequency Scaling (DVFS) has been the tool of choice for balancing power and performance in high-performance computing (HPC). With the introduction of Intel's Sandy Bridge family of processors, researchers now have a far more attractive option: user-specified, dynamic, hardware-enforced processor power bounds. In this paper we provide a first look at this technology in the HPC environment and detail both the opportunities and potential pitfalls of using this technique to control processor power. As part of this evaluation we measure power and performance for single-processor instances of several of the NAS Parallel Benchmarks. Additionally, we focus on the behavior of a single benchmark, MG, under several different power bounds. We quantify the well-known manufacturing variation in processor power efficiency and show that, in the absence of a power bound, this variation has no correlation to performance. We then show that execution under a power bound translates this variation in efficiency into variation in performance.
ISBN:1467309745
9781467309745
DOI:10.1109/IPDPSW.2012.116