A multiprocessor computer can execute a program using multiple processors. If the problem can be divided into parts that can run on the following number of processors, what is the speedup?
Number of Processors 40 20 20 2
Percent of program serial 20 2 10 40
Amdahl’s law states that the time to perform the computation with parallel processing is serial fraction plusparallel fraction/number of processors = fs + (1 ? fs)/n where n is the number of processors. The speedup is time without parallel processors divided by the time with parallel processors = 1/( fs + (1 ? fs)/n) = n/(nfs + 1 ? fs)
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