NDLI: Sliding Substitution of Failed Nodes

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Sliding Substitution of Failed Nodes

Content Provider	ACM Digital Library
Author	Ishikawa, Yutaka Yoshinaga, Kazumi Bouteiller, Aurélien Herault, Thomas Hori, Atsushi Bosilca, George
Abstract	This paper considers the questions of how spare nodes should be allocated, how to substitute them for faulty nodes, and how much the communication performance is affected by such a substitution. The third question stems from the modification of the rank mapping by node substitutions, which can incur additional message collisions. In a stencil computation, rank mapping is done in a straightforward way on a Cartesian network without incurring any message collisions. However, once a substitution has occurred, the node- rank mapping may be destroyed. Therefore, these questions must be answered in a way that minimizes the degradation of communication performance. In this paper, several spare-node allocation and nodesubstitution methods will be proposed, analyzed, and compared in terms of communication performance following the substitution. It will be shown that when a failure occurs, the peer-to-peer (P2P) communication performance on the K computer can be slowed by a factor of three and collective performance can be cut in half. On BG/Q, P2P performance can be slowed by a factor of five and collective performance can be slowed by a factor of ten. However, those numbers can be reduced by using an appropriate substitution method.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISBN	9781450337953
DOI	10.1145/2802658.2802670
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-09-21
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Fault mitigation Fault tolerance Spare node Communication performance
Content Type	Text
Resource Type	Article

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