New PDF release: Concurrent Scientific Computing

By Eric F. Van de Velde

ISBN-10: 1461208491

ISBN-13: 9781461208495

ISBN-10: 1461269210

ISBN-13: 9781461269212

Mathematics is enjoying an ever extra vital function within the actual and organic sciences, scary a blurring of obstacles among clinical dis­ ciplines and a resurgence of curiosity within the glossy in addition to the classical thoughts of utilized arithmetic. This renewal of curiosity, either in examine and educating, has ended in the institution of the sequence: Texts in utilized Mathe­ matics (TAM). the improvement of recent classes is a average final result of a excessive point of pleasure at the examine frontier as more moderen recommendations, resembling numerical and symbolic desktops, dynamical structures, and chaos, combine with and strengthen the conventional tools of utilized arithmetic. hence, the aim of this textbook sequence is to satisfy the present and destiny wishes of those advances and inspire the instructing of latest classes. TAM will post textbooks compatible to be used in complicated undergraduate and starting graduate classes, and may supplement the utilized Mathematical Sciences (AMS) sequence, on the way to specialise in complicated textbooks and examine point monographs. Preface A winning concurrent numerical simulation calls for physics and math­ ematics to boost and research the version, numerical research to advance answer equipment, and desktop technology to boost a concurrent implemen­ tation. No unmarried path can or may still disguise a majority of these disciplines. as an alternative, this direction on concurrent medical computing specializes in an issue that isn't lined or is insufficiently lined through different disciplines: the algorith­ mic constitution of numerical methods.

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Extra info for Concurrent Scientific Computing

Example text

If the sequential computation is too slow for some reason, the resulting speed-up may leave the impression of good performance, independent of whether good performance was actually achieved. The popularity of speed-up and efficiency plots is partially due to an inflated regard for the importance of Theorem 1. Its simple formulation is deceptive and hides the fact that its result is far removed from the practical world of computing. The number of nodes remains as the only study parameter, because all other computational parameters are eliminated by the clever definition of the best p-node computation as the optimum over the space of all possible p-node computations.

P - 1, \1m E Mp : x Yrn and, for an arbitrary value of p E (j(=) o.. P - value(x[p] [m]) at initially value(y[p] [m]) at initially 1, let = value((j[p]) at end. 3, which establishes the lemma. L but also the process p that defines the value (j(=) is left unspecified. Once again, the duplication step is followed by the selection step. Here, we impose a specific data distribution on the arrays x and y and eliminate superfluous arithmetic from program Inner-Product-2. L of the index set M = O.. M - l.

P - 1 II p program Inner-Product-3 declare i : integer; a : real; w : array [O .. , i .. p".. L- 1 (p,i) assign := ( + i : i E Ip :: x[i]y[i] ) send w[P] to all ; ( ; q : 0::; q < P and q =I- p .. receive w[q] from q w[P] ); a :=( end +q : 0::; q < P :: w[q] ) The process identifier of all variables is implicit. The variable w is an array of length P in every process. Program Inner-Product-3 no longer contains a barrier; it has become superfluous, because the value of w[P] is sent out only after it has been properly initialized and the receive primitive waits until the message arrives.

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Concurrent Scientific Computing by Eric F. Van de Velde

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