By J. T. Feo
As execution speeds achieve the actual limits of unmarried cpu pcs, the single desire of attaining larger computing energy is with parallel platforms. Researchers have proposed numerous new programming languages, yet their alterations, similarities, strengths, weaknesses and challenge domain names are sophisticated and infrequently no longer good understood. expert comparability of parallel languages is difficult.
This quantity compares 8 parallel programming languages in response to ideas to 4 difficulties. every one bankruptcy encompasses a description of the language's philosophy, semantics and syntax, and an answer to every challenge. via contemplating suggestions instead of language gains or theoretical houses, the distance is bridged among the language experts and clients. either execs and scholars within the fields of machine and computational technology will locate the discussions beneficial and understandable.
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Extra info for A Comparative Study of Parallel Programming Languages. The Salishan Problems
In the problem solu tions, we make only limited use of this facility. In the paraffins prob lem, we use discriminants and variant parts to define a record type for paraffin radicals that can have one of two distinct layouts and a record type for paraffin molecules that can also have one of two distinct lay outs. In the skyline matrix problem, we use discriminants to hold the bounds of a record component that is an array. In both cases, the ob jects of the record types are dynamically allocated with constrained layouts.
1. Serial Solution For the sake of simplicity, we develop in this section a completely serial solution to the paraffins problem; in the next section, we discuss the opportunities for parallelism presented by the problem and obtain one parallel solution by a straightforward modification of a small part of the serial solution. At the top level, our serial solution is in the form of a function, paraffins (shown in Figure 15), that takes a positive integer n, and re turns an array, indexed by the values 1 t o n , whose i-th component is a list of the unique paraffin isomers of size L The function is compiled in the context of some application-dependent types for radicals and molecules that are defined in the two library packages ( r a d i c a l s and molecules) named in its context clauses.
As each such partition is enumerated, we subordinately enumerate all lexicographically ordered quads of radicals having the indicated sizes. Each such quad gives the actual radicals that need to be attached (in order) to a carbon atom to obtain a CCP of size I In theory, we do not need to enumerate partitions to obtain the sizes of the constituent radicals of BCPs of size i, since the only parti tion we need is (2, 2), and it c a n be obtained simply by constructing its sole element. However, we can reuse the software components used for generating radicals and CCPs by supplying them with parameters that will enumerate all ordered, nondecreasing, binary partitions of i having elements of both minimum and maximum size ^ of course, there will be only one.
A Comparative Study of Parallel Programming Languages. The Salishan Problems by J. T. Feo