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A Thermal Aware Routing Algorithm for Application-Specific Network-on-Chip

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Routing Algorithms in Networks-on-Chip

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Abstract

In this chapter, we propose a routing algorithm to reduce the hotspot temperature for application-specific Network-on-chip (NoC). Using the traffic information of the applications as well as the mapping of the tasks onto the NoC, we design a routing scheme which can achieve a higher adaptivity than the generic ones and at the same time distribute the traffic more uniformly across the chip. A set of admissible paths which is deadlock free for all the communications is first obtained. To reduce the hotspot temperature, we propose to route packets using the optimal distribution ratio of the communication traffic among the set of candidate paths. The problem of finding this optimal distribution ratio is formulated as a linear programming (LP) problem and is solved in the offline phase. A router microarchitecture which supports the ratio-based selection policy is also proposed. From the simulation results, the peak energy reduction considering the energy consumption of both the processor elements and routers can be as high as 20% for synthetic traffic and real benchmarks.

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Notes

  1. 1.

    \(C_{n}^{r}\) is the combination notation, where \(C_{n}^{r} = \frac{n!} {r!(n-r)!}\)

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Authors and Affiliations

  1. VLSI Research Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Hong Kong, China

    Zhiliang Qian & Chi-Ying Tsui

Authors
  1. Zhiliang Qian
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  2. Chi-Ying Tsui
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Correspondence to Zhiliang Qian .

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Editors and Affiliations

  1. Facoltà di Ingegneria, Università degli Studi di Enna, 'Kore', Enna, Italy

    Maurizio Palesi

  2. Department of IT, University of Turku, Turku, Finland

    Masoud Daneshtalab

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Qian, Z., Tsui, CY. (2014). A Thermal Aware Routing Algorithm for Application-Specific Network-on-Chip. In: Palesi, M., Daneshtalab, M. (eds) Routing Algorithms in Networks-on-Chip. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8274-1_11

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  • DOI: https://doi.org/10.1007/978-1-4614-8274-1_11

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  • Online ISBN: 978-1-4614-8274-1

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