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SUMMARY:KnightShift: Achieving Energy Proportionality Through Server-level
  Heterogeneity
DTSTART:20141029T161500
DTEND:20141029T173000
DTSTAMP:20260407T103003Z
UID:bc0c36fc7f6535dc0fcc4395ed178adb55b66227e51f5b9c64b66bb4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Murali Annavaram\, University of Southern California\nMeasurin
 g energy proportionality accurately and understanding the reasons for disp
 roportionality are critical first steps in designing energy efficient serv
 ers of the future. Toward this end we first present two metrics\, linear d
 eviation and proportionality gap\, that enable system designers to analyze
  and understand the energy consumption of a server at various utilization 
 levels. The value of these metrics is then demonstrated by analyzing the e
 nergy proportionality trend of 291 servers collected from the published SP
 ECpower results between November 2007 and December 2011. This analysis sho
 ws that energy proportionality improvements are not uniform across various
  server utilization levels. In particular\, the energy proportionality of 
 even a highly proportional server suffers significantly at non-zero but lo
 w utilizations. \nIn the second part of this talk we tackle the lack of e
 nergy proportionality at low utilization by using server-level heterogenei
 ty to provide an active low power mode. We present KnightShift\, where a h
 igh-performance server is tightly-coupled with a low-power compute node ca
 lled the Knight. Knight responds to low utilization requests while the pri
 mary server responds only to high utilization requests\, thereby enabling 
 two energy-efficient operating regions. KnightShift is evaluated against a
  variety of real-world datacenter workloads using a combination of prototy
 ping and simulation\, showing up to 75% energy savings with tail latency b
 ounded by the latency of the Knight. This talk is a amalgamation of our en
 ergy proportionality work that appeared in MICRO & IEEE Micro TopPicks 201
 3\, and HPCA 2014.
LOCATION:BC 410 https://plan.epfl.ch/?room==BC%20410
STATUS:CONFIRMED
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