The Essentials ofComputer(computer) 443

The Essentials ofComputer(computer) 443 - isnt amenable to...

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isn’t amenable to a parallel solution, generally it is not cost effective to port it to a multiprocessing parallel architecture. Implemented correctly, parallelism results in higher throughput, better fault tolerance, and a more attractive price/performance ratio. Although parallelism can result in significant speedup, this speedup can never be perfect. Given n proces- sors running in parallel, perfect speedup would imply that a computational job could complete in 1 n time, leading to an n -fold increase in power (or a runtime decrease by a factor of n ). We need only recall Amdahl’s Law to realize why perfect speedup is not pos- sible. If two processing components run at two different speeds, the slower speed will dominate. This law also governs the speedup attainable using parallel proces- sors on a problem. No matter how well you parallelize an application, there will always be a small portion of work done by one processor that must be done seri- ally. Additional processors can do nothing but wait until the serial processing is
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