Approximate Parallel Scheduling, Vol. 2 PDF ePub eBook

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Approximate Parallel Scheduling, Vol. 2 free pdf Excerpt from Approximate Parallel Scheduling, Vol. 2: Part II: Applications to Optimal Parallel Graph Algorithms in Logarithmic Time Part I of this paper presented a novel technique for approximate parallel scheduling and a new logarithmic time optimal parallel algorithm for the list ranking problem. In this part, we give a new logarithmic time parallel (Pram) algorithm for computing the connected components of undirected graphs which uses this scheduling technique. The connectivity algorithm is optimal unless m= o(n log n), in graphs of n vertices and m edges. Using known results, this new algorithms imply logarithmic time optimal parallel algorithms for a number of other graph problems, including: biconnectivity, Euler tours, strong orientation and r-numbering. Another contribution of the present paper is a parallel union/find algorithm. To the best of our knowledge, this paper presents for the first time optimal, logarithmic time, parallel algorithms for problems on graphs. 1. Introduction The models of parallel computation used in this paper are all members of the parallel random, access machine (Pram) family. A Pram employs? synchronous processors all having access to a common memory. An exclusive-read exclusive-write (Crew) Pram does not allow simultaneous access by more than one processor to the same memory location for read or write purposes. A concurrent-read exclusive-write (Crew) Pram allows simultaneous access for reads but not writes. A concurrent-read concurrent-write (Crcw) Pram allows concurrent access for both reads and writes. For the Crcw Pram, we assume that if several processors attempt to write simultaneously at the same memory location then one of them succeeds but we do not know in advance which one. See [Vi-83] for a- survey of results concerning Prams. Let Seq(n) be the fastest known worst-case running time of a sequential algorithm, where nis the length of the input for the problem at hand. Obviously, the best upper bound on the parallel time achievable using pprocessors, without improving the sequential result, is of the form O(Seqn)/p). A parallel algorithm that achieves this running time is said to have optimal speed-up or more simply to be optimal. A primary goal in parallel computation is to design optimal algorithms that also run as fast as possible. Most of the problems we consider can be solved by parallel algorithms that obey the following framework. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully- any imperfections that remain are intentionally left to preserve the state of such historical works.

About Richard Cole

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Details Book

Author : Richard Cole
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 1332101542
EAN : 9781332101542
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 52 pages
Age + : 15 years
Language : English
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  • Approximate Parallel Scheduling, Vol. 2 free pdfApproximate Parallel Scheduling, Vol. 2

    . Excerpt from Approximate Parallel Scheduling, Vol. 2: Part II: Applications to Optimal Parallel Graph Algorithms in Logarithmic Time Part I of this paper presented a novel technique for approximate