NDLI: Compact network reconfiguration in fat-trees

Content Provider	Springer Nature Link
Author	Zahid, Feroz Gran, Ernst Gunnar Bogdański, Bartosz Johnsen, Bjørn Dag Skeie, Tor Tasoulas, Evangelos
Copyright Year	2016
Abstract	In large high-performance computing systems, the probability of component failure is high. At the same time, for a sustained system performance, reconfiguration is often needed to ensure high utilization of available resources. Reconfiguration in interconnection networks, like InfiniBand (IB), typically involves computation and distribution of a new set of routes in order to maintain connectivity and performance. In general, current routing algorithms do not consider the existing routes in a network when calculating new ones. Such configuration-oblivious routing might result in substantial modifications to the existing paths, and the reconfiguration becomes costly as it potentially involves a large number of source–destination pairs. In this paper, we propose a novel routing algorithm for IB-based fat-tree topologies, SlimUpdate. SlimUpdate employs path preservation techniques to achieve a decrease of up to 80 % in the number of total path modifications, as compared to the OpenSM’s fat-tree routing algorithm, in most reconfiguration scenarios. Furthermore, we present a metabase-aided re-routing method for fat-trees, based on destination leaf-switch multipathing. Our proposed method significantly reduces network reconfiguration overhead, while providing greater routing flexibility. On successive runs, our proposed method saves up to 85 % of the total routing time over the traditional re-routing scheme. Based on the metabase-aided routing, we also present a modified SlimUpdate routing algorithm to dynamically optimize routes for a given MPI node order.
Starting Page	4438
Ending Page	4467
Page Count	30
File Format	PDF
ISSN	09208542
Journal	The Journal of Supercomputing
Volume Number	72
Issue Number	12
e-ISSN	15730484
Language	English
Publisher	Springer US
Publisher Date	2016-05-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Routing algorithms Interconnection networks Network reconfiguration Fat-trees InfiniBand Programming Languages, Compilers, Interpreters Processor Architectures Computer Science
Content Type	Text
Resource Type	Article
Subject	Theoretical Computer Science Information Systems Hardware and Architecture Software

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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