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sladkih
3 months ago
9

Assume a program requires the execution of 50 x 106 FP instructions, 110 x 106 INT instructions, 80 x 106 L/S instructions, and

16 x 106 branch instructions. The CPI for each type of instruction is 1 1, 4, and 2, respectively. Assume that the processor has a 2 GHz clock rate 1.141 [10] <$1.10 By how much must we improve the CPI of FP instructions if we want the program to run two times faster? 1.14.2 [10]
Computers and Technology
1 answer:
ivann1987 [1K]3 months ago
3 0

Clarification:

FP - 50 \times 10^6

CPI - 1

INT - 110 \times 10^6,

CPI - 1

I/S - 80 \times 10^6,

CPI - 4

Branch - 16 \times 10^6

CPI - 2

Clock Speed - 2 \times 10^9

Time(old) = \frac{50 x 10^6 + 110 x 10^6 + 4 x ( 80 x 10^6) + 2 x (16 x 10^ 6)}{2 x 10^9}

Time(old) = 256 \times 10^ {-3}

Time(new) = \frac{256 \times 10^{-3}}{2}

                = 128 \times 10^{-3}

                = \frac{CPI(new) x [50 x 10^6 + 110 x 10^6 + 4 x ( 80 x 10^6) + 2 x (16 x 10^ 6)]}{2 x 10^9}

                = 128 \times 10^{-3}

CPI(new) = \frac{-206}{50}

               = -4.12

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