Download Algorithms - ESA 2008: 16th Annual European Symposium, by Mark Overmars, Ioannis Karamouzas, Roland Geraerts (auth.), PDF

By Mark Overmars, Ioannis Karamouzas, Roland Geraerts (auth.), Dan Halperin, Kurt Mehlhorn (eds.)

ISBN-10: 3540877436

ISBN-13: 9783540877431

ISBN-10: 3540877444

ISBN-13: 9783540877448

This publication constitutes the refereed lawsuits of the sixteenth Annual ecu Symposium on Algorithms, ESA 2008, held in Karlsruhe, Germany, in September 2008 within the context of the mixed convention ALGO 2008.

The sixty seven revised complete papers provided including 2 invited lectures have been conscientiously reviewed and chosen: fifty one papers out of 147 submissions for the layout and research tune and sixteen out of fifty three submissions within the engineering and functions song. The papers deal with all present topics in algorithmics attaining from layout and research problems with algorithms over to real-world purposes and engineering of algorithms in numerous fields. unique concentration is given to mathematical programming and operations learn, together with combinatorial optimization, integer programming, polyhedral combinatorics and community optimization.

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Extra resources for Algorithms - ESA 2008: 16th Annual European Symposium, Karlsruhe, Germany, September 15-17, 2008. Proceedings

Sample text

Our basic algorithm FFT(mj , x, j) for x FFTs on disjoint sets of mj /x points all initially held in the level j memory with the output to be held also at that level will be performed by doing (i) mj /mj−1 problems of type FFT(mj−1 , 1, j − 1), and (ii) on the mj values so obtained doing FFT(mj , xmj−1 , j). In other words (i) will solve each disjoint set of mj /x points by doing mj /(xmj−1 ) FFT’s on mj−1 points each, and (ii) states that the effect of this is to increase the A Bridging Model for Multi-core Computing 25 number (and hence reduce the size) of the resulting FFT problems remaining by a factor of mj−1 .

At each level the four parameters quantify, respectively, the number of subcomponents, the bandwidth, the synchronization cost, and the memory/cache size. It may be thought that proliferating numerical parameters only further exponentiates the difficulty of designing parallel algorithms. The main observation of this paper is that this is not necessarily the case. In particular we show, by means mostly of well-known ideas, that for problems such as matrix multiplication, fast Fourier transform and sorting, for which optimal algorithms can be written with the few parameters of the standard BSP model, the same holds also for an arbitrary number of levels.

13–28, 2008. G. Valiant parameters that reflect ultimate physical constraints, and (iii) it has as its nonlocal primitive barrier synchronization which is powerful and relatively easy to realize. In this paper we introduce the Multi-BSP model which extends BSP in two ways. First, it is a hierarchical model with an arbitrary number of levels that recognizes the physical realities of multiple memory and cache levels in single chips, as well as in multi-chip architectures constructed from these. The aim is to model all levels of an architecture together.

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