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Light NUCA: a proposal for bridging the inter-cache latency gap
Suárez, Dario; Monreal Arnal, Teresa; Vallejo, Fernando; Beivide Palacio, Julio Ramón; Viñals Yufera, Víctor
Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors
To deal with the “memory wall” problem, microprocessors include large secondary on-chip caches. But as these caches enlarge, they originate a new latency gap between them and fast L1 caches (inter-cache latency gap). Recently, Non-Uniform Cache Architectures (NUCAs) have been proposed to sustain the size growth trend of secondary caches that is threatened by wire-delay problems. NUCAs are size-oriented, and they were not conceived to close the inter-cache latency gap. To tackle this problem, we propose Light NUCAs (L-NUCAs) leveraging on-chip wire density to interconnect small tiles through specialized networks, which convey packets with distributed and dynamic routing. Our design reduces the tile delay (cache access plus one-hop routing) to a single processor cycle and places cache lines at a finer-granularity than conventional caches reducing cache latency. Our evaluations show that in general, L-NUCA improves simultaneously performance, energy, and area when integrated into both conventional or D-NUCA hierarchies.
Àrees temàtiques de la UPC::Informàtica::Arquitectura de computadors
Computer storage devices
Non-uniform cache architectures
Light NUCAs
Ordinadors -- Memòries
Attribution-NonCommercial-NoDerivs 3.0 Spain
IEEE Computer Society

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