Download A Comparative Study of Parallel Programming Languages. The by J. T. Feo PDF

By J. T. Feo

As execution speeds succeed in the actual limits of unmarried cpu desktops, the single wish of attaining better computing strength is with parallel structures. Researchers have proposed numerous new programming languages, yet their transformations, similarities, strengths, weaknesses and challenge domain names are refined and sometimes no longer good understood. educated comparability of parallel languages is difficult.

This quantity compares 8 parallel programming languages in accordance with suggestions to 4 difficulties. each one bankruptcy incorporates a description of the language's philosophy, semantics and syntax, and an answer to every challenge. by means of contemplating strategies instead of language gains or theoretical houses, the space is bridged among the language experts and clients. either execs and scholars within the fields of desktop and computational technology will locate the discussions necessary and understandable.

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Extra resources for A Comparative Study of Parallel Programming Languages. The Salishan Problems

Sample text

The prob­ lem is as follows: Given an integer n, output—in order of increasing size—structural representations of all paraffin molecules for £ < n, in­ cluding all isomers but no duplicates. The paraffins problem was designed to reveal the strengths of ap­ plicative languages. Turner's original solution [10] in the applicative language KRC makes extensive use of set abstraction and higher-order functions to produce a compact and elegant program at the cost of some inefficiency. His program was designed to produce all paraffin molecules of a given size by attaching paraffin radicals of appropriate Ada 41 sizes to a leading carbon atom without regard, initially, to the fact that this simple process yields many different representations (different orientations) of each of the distinct paraffin isomers.

Finally, it is worth emphasizing that the trees we construct to rep­ resent radicals and molecules share components. Thus, the subradicals of a radical do not occupy storage independently from their oc­ currences as top-level radicals in their own right, or from other oc­ currences of themselves as subradicals of a different radical. The cre­ ation of a new radical does not require the copying of subradicals, nor does the creation of a molecule require the copying of radicals; they require only the allocation of a single new root node, which is initial­ ized with pointers to the appropriate subnodes.

These names in­ clude r a d i c a l l i s t s and m o l e c u l e l i s t s , the packages obtained in r a d i c a l s and m o l e c u l e s by the instantiation therein of l i s t s . However, the visible names do not include those of the operations on lists (head, t a i l , append, i s e m p t y ) , since those operations are not declared in r a d i c a l s or m o l e c u l e s . It is the function of the second use clause, the one in the declarative part of the p a r a f f i n s function, to provide direct visibility to them.

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