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Problem 4 . Amdahl s Law ( 2 0 points ) Please show all work and calculations in your answers. Assume a program requires the
Problem Amdahls Law points
Please show all work and calculations in your answers.
Assume a program requires the execution of e FP instructions, e INT instructions, e LS instructions, and e branch instructions. The CPI for each type of instruction is and respectively. Assume that the processor has a GHz clock rate.
Execution Time Number of Instructions CPI Clock Rate
FP: ee Seconds
INT: ee seconds
LS: ee seconds
Branch: ee seconds
Total Execution time
By how much must we improve the CPI of FP instructions if we want the program to run two times faster?
By how much must we improve the CPI of LS instructions if we want the program to run two times faster?
By how much is the execution time of the program improved if the CPI of INT and FP instructions is reduced by and the CPI of LS and Branch is reduced by
Suppose we can improve the floatingpoint instruction performance of a CPU by a factor of The floatingpoint instructions are accomplished times faster. If floating point instructions account for of the total time executing a program, how much speedup can be achieved with this improvement?
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