An Energy Efficiency Feature Survey of the Intel Haswell Processor

The recently introduced Intel Xeon E5-1600 v3 and E5-2600 v3 series processors -- codenamed Haswell-EP -- implement major changes compared to their predecessors. Among these changes are integrated voltage regulators that enable individual voltages and frequencies for every core. In this paper we ana...

Celý popis

Uloženo v:

Podrobná bibliografie
Vydáno v:	2015 IEEE International Parallel and Distributed Processing Symposium Workshop s. 896 - 904
Hlavní autoři:	Hackenberg, Daniel, Schone, Robert, Ilsche, Thomas, Molka, Daniel, Schuchart, Joseph, Geyer, Robin
Médium:	Konferenční příspěvek
Jazyk:	angličtina
Vydáno:	IEEE 01.05.2015
Témata:	Benchmark testing Energy measurement Frequency measurement Power demand Random access memory Regulators Voltage control
On-line přístup:	Získat plný text
Tagy:	Přidat tag Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!

Popis
Shrnutí:	The recently introduced Intel Xeon E5-1600 v3 and E5-2600 v3 series processors -- codenamed Haswell-EP -- implement major changes compared to their predecessors. Among these changes are integrated voltage regulators that enable individual voltages and frequencies for every core. In this paper we analyze a number of consequences of this development that are of utmost importance for energy efficiency optimization strategies such as dynamic voltage and frequency scaling (DVFS) and dynamic concurrency throttling (DCT). This includes the enhanced RAPL implementation and its improved accuracy as it moves from modeling to actual measurement. Another fundamental change is that every clock speed above AVX frequency -- including nominal frequency -- is opportunistic and unreliable, which vastly decreases performance predictability with potential effects on scalability. Moreover, we characterize significantly changed p-state transition behavior, and determine crucial memory performance data.
DOI:	10.1109/IPDPSW.2015.70