Maciej Besta, S. M. Hassan, S. Yalamanchili, R. Ausavarungnirun, Onur Mutlu, Torsten Hoefler:
Slim NoC: A Low-Diameter On-Chip Network Topology for High Energy Efficiency and Scalability
(Mar. 2018, Accepted at the 23rd ACM International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS'18) )
Abstract
Emerging chips with hundreds and thousands of cores require networks
with unprecedented energy/area efficiency and scalability.
To address this, we propose Slim NoC (SN): a new on-chip network
design that delivers significant improvements in efficiency and scalability
compared to the state-of-the-art. The key idea is to use two
concepts from graph and number theory, degree-diameter graphs
combined with non-prime finite fields, to enable the smallest number
of ports for a given core count. SN is inspired by state-of-the-art
off-chip topologies; it identifies and distills their advantages for NoC
settings while solving several key issues that lead to significant
overheads on-chip. SN provides NoC-specific layouts, which further
enhance area/energy efficiency. We show how to augment SN with
state-of-the-art router microarchitecture schemes such as Elastic
Links, to make the network even more scalable and efficient. Our
extensive experimental evaluations show that SN outperforms both
traditional low-radix topologies (e.g., meshes and tori) and modern
high-radix networks (e.g., various Flattened Butterflies) in area, latency,
throughput, and static/dynamic power consumption for both
synthetic and real workloads. SN provides a promising direction in
scalable and energy-efficient NoC topologies.
Documents
download article: download slides:
Recorded talk (best effort)
BibTeX
@inproceedings{, author={Maciej Besta and S. M. Hassan and S. Yalamanchili and R. Ausavarungnirun and Onur Mutlu and Torsten Hoefler}, title={{Slim NoC: A Low-Diameter On-Chip Network Topology for High Energy Efficiency and Scalability}}, year={2018}, month={Mar.}, note={Accepted at the 23rd ACM International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS'18)}, source={http://www.unixer.de/~htor/publications/}, }
