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Computer Science > Distributed, Parallel, and Cluster Computing

arXiv:2211.11817 (cs)
[Submitted on 21 Nov 2022]

Title:High-Quality Fault-Resiliency in Fat-Tree Networks (Extended Abstract)

Authors:John Gliksberg (LI-PaRAD, UCLM), Antoine Capra, Alexandre Louvet, Pedro Javier Garcia (UCLM), Devan Sohier (LI-PaRAD)
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Abstract:Coupling regular topologies with optimized routing algorithms is key in pushing the performance of interconnection networks of HPC systems. In this paper we present Dmodc, a fast deterministic routing algorithm for Parallel Generalized Fat-Trees (PGFTs) which minimizes congestion risk even under massive topology degradation caused by equipment failure. It applies a modulo-based computation of forwarding tables among switches closer to the destination, using only knowledge of subtrees for pre-modulo division. Dmodc allows complete rerouting of topologies with tens of thousands of nodes in less than a second, which greatly helps centralized fabric management react to faults with high-quality routing tables and no impact to running applications in current and future very large-scale HPC clusters. We compare Dmodc against routing algorithms available in the InfiniBand control software (OpenSM) first for routing execution time to show feasibility at scale, and then for congestion risk under degradation to demonstrate robustness. The latter comparison is done using static analysis of routing tables under random permutation (RP), shift permutation (SP) and all-to-all (A2A) traffic patterns. Results for Dmodc show A2A and RP congestion risks similar under heavy degradation as the most stable algorithms compared, and near-optimal SP congestion risk up to 1% of random degradation.
Subjects: Distributed, Parallel, and Cluster Computing (cs.DC); Networking and Internet Architecture (cs.NI)
Cite as: arXiv:2211.11817 [cs.DC]
  (or arXiv:2211.11817v1 [cs.DC] for this version)
  https://doi.org/10.48550/arXiv.2211.11817
Journal reference: 2019 IEEE Symposium on High-Performance Interconnects (HOTI), Aug 2019, Santa Clara, United States. pp.9-12
Related DOI: https://doi.org/10.1109/HOTI.2019.00015

Submission history

From: John Gliksberg [view email] [via CCSD proxy]
[v1] Mon, 21 Nov 2022 19:29:43 UTC (89 KB)
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