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Optimal prefetching and caching for parallel I/O sytems

Published: 03 July 2001 Publication History

Abstract

We address the problem of prefetching and caching in a parallel I/O system and present a new algorithm for optimal parallel-disk scheduling. Traditional buffer management algorithms that minimize the number of I/O disk accesses, are substantially suboptimal in a parallel I/O system where multiple I/Os can proceed simultaneously.
We present a new algorithm SUPERVISOR for parallel-disk I/O scheduling. We show that in the off-line case, where apriori knowledge of all the requests is available, SUPERVISOR performs the minimum number of I/Os to service the given I/O requests. This is the first parallel I/O scheduling algorithm that is provably offline optimal. In the on-line case, we study SUPERVISOR in the context of global L-block lookahead, which gives the buffer management algorithm a lookahead consisting of L distinct requests. We show that the competitive ratio of SUPERVISOR, with global L-block lookahead, is Θ(M - L + D), when L ≤ M, and Θ(MD/L), when L > M, where the number of disks is D and buffer size is M.

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cover image ACM Conferences
SPAA '01: Proceedings of the thirteenth annual ACM symposium on Parallel algorithms and architectures
July 2001
340 pages
ISBN:1581134096
DOI:10.1145/378580
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Published: 03 July 2001

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SPAA '01 Paper Acceptance Rate 34 of 93 submissions, 37%;
Overall Acceptance Rate 447 of 1,461 submissions, 31%

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  • (2008)Profiler and compiler assisted adaptive I/O prefetching for shared storage cachesProceedings of the 17th international conference on Parallel architectures and compilation techniques10.1145/1454115.1454133(112-121)Online publication date: 25-Oct-2008
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