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PRODID:-//Cornell U. Department of Computer Science//Brown Bag Seminar//EN
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SUMMARY:Brown bag: José Martínez
DESCRIPTION:Title: XChange: Scalable Dynamic Multi-Resource Allocation in
	 Multicore Architectures\nSpeaker: José Martínez\nAbstract: Efficiently
	 allocating shared on-chip resources across cores is critical to optimize
	 execution in chip multiprocessors (CMPs). Techniques proposed in the
	 literature often rely on global\, centralized mechanisms that seek to
	 maximize system throughput. However\, global optimization may hurt
	 scalability: as more cores are integrated on a die\, the search space
	 grows exponentially\, making it harder to achieve optimal or even
	 acceptable operating points at run-time without incurring significant
	 overheads.\n\nIn this paper\, we propose XChange\, a novel CMP resource
	 allocation mechanism that delivers scalable high throughput and
	 fairness. Through XChange\, the CMP functions as a market\, where each
	 shared resource is assigned a price which changes over time\, and each
	 core seeks to maximize its own utility\, by bidding for these shared
	 resources. Because each core works largely independently\, the resource
	 allocation becomes a scalable\, mostly distributed decision-making
	 process. In addition\, by distributing the resources proportionally to
	 the bids\, the system avoids unfairness\, treating each core in an
	 unbiased manner.\n\nOur evaluation shows that\, using detailed
	 simulations of a 64-core CMP configuration running a variety of
	 multiprogrammed workloads\, the proposed XChange mechanism improves
	 system throughput (weighted speedup) by about 21% on average\, and
	 fairness (harmonic speedup) by about 24% on average\, compared with
	 equal-share on-chip cache and power distribution. On both metrics\, that
	 is at least about twice as much improvement over equal-share as a
	 state-of-the-art centralized allocation scheme. Furthermore\, our
	 results show that XChange is significantly more scalable than the
	 state-of-the-art centralized allocation scheme we compare against.
LOCATION:Gates 122
UID:2015-03-17
STATUS:CONFIRMED
DTSTART:20150317T160000Z
DTEND:20150317T170000Z
LAST-MODIFIED:20150311T200459Z
ORGANIZER;CN=Jonathan Shi:http://www.cs.cornell.edu/~jshi/brownbag/
DTSTAMP:20260408T173059Z
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