Algorithms and Parallel Computing (Wiley Series on Parallel by Fayez Gebali

By Fayez Gebali

There's a software program hole among the capability and the functionality that may be attained utilizing today's software program parallel application improvement instruments. The instruments want handbook intervention through the programmer to parallelize the code. Programming a parallel desktop calls for heavily learning the objective set of rules or program, extra so than within the conventional sequential programming now we have all discovered. The programmer needs to be conscious of the verbal exchange and knowledge dependencies of the set of rules or program. This e-book presents the concepts to discover the prospective how you can software a parallel machine for a given program.

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Extra resources for Algorithms and Parallel Computing (Wiley Series on Parallel and Distributed Computing)

Example text

4 Serial Algorithms A serial algorithm is one where the tasks must be performed in series one after the other due to their data dependencies. 3 Example of serial, parallel, and serial–parallel algorithms. (a) Serial algorithm. (b) Parallel algorithm. (c) Serial–parallel algorithm. like a long string or queue of dependent tasks. 3a shows an example of a serial algorithm. The algorithm shown is for calculating Fibonnaci numbers. 4) with n0 = 0 and n1 = 1 given as initial conditions. Clearly, we can find a Fibonacci number only after the preceding two Fibonacci numbers have been calculated.

The time taken to process the task on N processors is given by Tp ( N ) = (1 − f )τ p + f τ p = τ p . 28) When this task is executed on a single processor, the serial part is unchanged, but the parallel part will increase as given by Tp (1) = (1 − f )τ p + Nfτ p . 29) The speedup is given now by S( N ) = Tp (1) Tp ( N ) = (1 − f ) + Nf = 1 + ( N − 1) f . 9 shows the speedup versus f for different values of N. 5. Notice that there is speedup even for very small values of f and the situation improves as N gets larger.

4 PARALLEL COMPUTING DESIGN CONSIDERATIONS This section discusses some of the important aspects of the design of parallel computing systems. The design of a parallel computing system requires considering many design options. The designer must choose a basic processor architecture that is capable of performing the contemplated tasks. The processor could be a simple element or it could involve a superscalar processor running a multithreaded operating system. The processors must communicate among themselves using some form of an interconnection network.

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