NDLI: Removing the latency overhead of the ITB mechanism in COWs with source routing

Content Provider	IEEE Xplore Digital Library
Author	Flich, J. Malumbres, M.P. Lopez, P. Duato, J.
Copyright Year	2002
Description	Author affiliation: Dpto. of Comput. Eng. (DISCA), Univ. Politecnica de Valencia, Spain (Flich, J.)
Abstract	Clusters of workstations (COWs) are becoming increasingly popular as a cost-effective alternative to parallel computers. The in-transit buffer (ITB) mechanism can improve network performance when applied to COWs with irregular topology and source routing. This mechanism considerably improves the performance of this kind of network when compared to current source routing algorithms; however, it introduces a latency penalty. An implementation of this mechanism was performed, showing that the latency overhead of the mechanism may be noticeable, especially for short messages and at low network loads. In this paper, we analyze in detail the latency overhead of ITBs, proposing several mechanisms to reduce, hide and remove it. Firstly, we show, by simulation, the effect of an ITB implementation that is much slower than the one implemented. Then we propose three mechanisms that try to overcome the latency penalty. All the mechanisms are simple and can be easily implemented; also, they are out of the critical path of the ITB packet-processing procedure. The results show very good behaviour of the proposed mechanisms, considerably reducing or even completely removing the latency overhead.
Starting Page	463
Ending Page	470
File Size	334283
Page Count	8
File Format	PDF
ISBN	0769514448
DOI	10.1109/EMPDP.2002.994334
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-01-09
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay Cows Routing Network topology Concurrent computing Workstations Local area networks Telecommunication traffic Large-scale systems Parallel processing
Content Type	Text
Resource Type	Article

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