NDLI: TurboTag: lookup filtering to reduce coherence directory power

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TurboTag: lookup filtering to reduce coherence directory power

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TurboTag: lookup filtering to reduce coherence directory power

Content Provider	ACM Digital Library
Author	Ferdman, Michael Lotfi-Kamran, Pejman Crisan, Daniel Falsafi, Babak
Abstract	On-chip coherence directories of today's multi-core systems are not energy efficient. Coherence directories dissipate a significant fraction of their power on unnecessary lookups when running commercial server and scientific workloads. These workloads have large working sets that are beyond the reach of on-chip caches of modern processors. Limited to capturing a small part of the working set, private caches retain cache blocks only for a short period of time before replacing them with new blocks. Moreover, coherence enforcement is a known performance bottleneck of multi-threaded software, hence data-sharing in optimized high performance software is minimal. Consequently, the majority of the accesses to the coherence directory find no sharers in the directory because the data are not available in the on-chip private caches, effectively wasting power on the coherence checks. To improve energy-efficiency for future many-core systems, we propose TurboTag, a filtering mechanism to eliminate needless directory lookups. We analyze full-system traces of server and scientific workloads and find that over 69% of accesses to the directory find no sharers and can be entirely avoided. Taking advantage of this behavior, TurboTag achieves a 58% reduction in the directory's dynamic power consumption.
Starting Page	377
Ending Page	382
Page Count	6
File Format	PDF
ISBN	9781450301466
DOI	10.1145/1840845.1840929
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-08-18
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Filter Bloom Coherence Low power Directory
Content Type	Text
Resource Type	Article

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