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Publications of SPCL

M. Besta, M. Schneider, M. Konieczny, K. Cynk, E. Henriksson, S. Di Girolamo, A. Singla, T. Hoefler:

 FatPaths: Routing in Supercomputers and Data Centers when Shortest Paths Fall Short

(In Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC20), presented in , , ISBN: , Nov. 2020, )


Abstract

We introduce FatPaths: a simple, generic, and robust routing architecture that enables state-of-the-art low-diameter topologies such as Slim Fly to achieve unprecedented performance. FatPaths targets Ethernet stacks in both HPC supercomputers as well as cloud data centers and clusters. FatPaths exposes and exploits the rich (“fat”) diversity of both minimal and non-minimal paths for high-performance multi-pathing. Moreover, FatPaths uses a redesigned “purified” transport layer that removes virtually all TCP performance issues (e.g., the slow start), and incorporates flowlet switching, a technique used to prevent packet reordering in TCP networks, to enable very simple and effective load balancing. Our design enables recent low-diameter topologies to outperform powerful Clos designs, achieving 15% higher net throughput at 2× lower latency for comparable cost. FatPaths will significantly accelerate Ethernet clusters that form more than 50% of the Top500 list and it may become a standard routing scheme for modern topologies.

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BibTeX

@inproceedings{besta-fp,
  author={Maciej Besta and Marcel Schneider and Marek Konieczny and Karolina Cynk and Erik Henriksson and Salvatore Di Girolamo and Ankit Singla and Torsten Hoefler},
  title={{FatPaths: Routing in Supercomputers and Data Centers when Shortest Paths Fall Short}},
  year={2020},
  month={11},
  booktitle={Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC20)},
  location={},
  publisher={},
  isbn={},
  note={},
}