Advanced Computer Architecture and Parallel Processing by Hesham El-Rewini, Mostafa Abd-El-Barr

By Hesham El-Rewini, Mostafa Abd-El-Barr

Laptop structure offers with the actual configuration, logical constitution, codecs, protocols, and operational sequences for processing information, controlling the configuration, and controlling the operations over a working laptop or computer. It additionally encompasses notice lengths, guide codes, and the interrelationships one of the major elements of a working laptop or computer or staff of pcs. This two-volume set deals a entire insurance of the sphere of desktop association and structure.

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Determine whether it is possible to connect input #I to output (i mod 8) for all I simultaneously. If it is possible show the routing in each case. 4. Consider a simple cost comparison between an n  n crossbar and an n  n Shuffle– Exchange MIN. While the crossbar uses cross points, the Shuffle network uses 2  2 switching elements (SEs). Assume that the cost of a 2  2SE is four times that of a cross point. What is the relative cost of an n  n Shuffle – Exchange network with respect to that of a crossbar of the same size?

In MINs, the routing of a message from a given source to a given destination is based on the destination address (self-routing). 9 Switches Switches Multistage interconnection network. 10 An example 8 Â 8 Shuffle – Exchange network (SEN). N Â N MIN. The number of bits in any destination address in the network is log2 N. Each bit in the destination address can be used to route the message through one stage. The destination address bits are scanned from left to right and the stages are traversed from left to right.

However, let us show the effect of the communication overhead on the speedup factor, given that a fraction, f, of the computation is not parallelizable. As stated earlier, the communication overhead should be included in the processing time. 1 f (n n 1 ¼ À 1) þ 1 þ n(tc =ts ) f þ (tc =ts ) The above formula indicates that the maximum speedup factor is determined not by the number of parallel processors employed but by the fraction of the computation that is not parallelized and the communication overhead.

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