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2013 Euromicro Conference on Digital System Design (2013)
Los Alamitos, CA, USA USA
Sept. 4, 2013 to Sept. 6, 2013
pp: 56-59
The continuous increase of the number of cores in tiled chip-multi-processors (CMP) will prevent traditional electronic networks on chip (NoC) to maintain an acceptable tradeoff between performance and power consumption. Recent advances in silicon-photonics open new opportunities for fast and low-energy on-chip interconnections but specific design and tuning is needed. This paper proposes Olympic, an all-optical NoC architecture using a hierarchical topology made up of replicated and cascaded simple photonic building blocks (rings). Local rings connect tiles within clusters directly and a global ring glues together local ones and enables inter-cluster communications. The all-optical approach allows to achieve a low-energy solution, very important for future embedded CMPs. The cost of these benefits resides mainly in the additional optical-electronic-optical conversions needed for inter-cluster transmissions and in this paper we single out promising design tradeoffs using the PARSEC benchmark suite. We show that a careful design of our Olympic clustered architecture can achieve 65% energy reduction with only 1% slowdown compared to a full 2D mesh, for a 16-core CMP.
Tiles, Photonics, Topology, Optical switches, Energy consumption, Wavelength division multiplexing, System-on-chip

S. Bartolini, L. Lusnig and E. Martinelli, "Olympic: A Hierarchical All-Optical Photonic Network for Low-Power Chip Multiprocessors," 2013 Euromicro Conference on Digital System Design(DSD), Los Alamitos, CA, USA USA, 2013, pp. 56-59.
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