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.25 .50 .75 1.0

f=Fraction of time doing fp operations

Speed-up

Amount of improvement in FP operations = 5

execution time

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KEY QUESTION: Suppose the MFP executes 3x108

instructions when it runs the BMP. How many instructions does the MNFP execute?

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MFP Extime = IC/(MIPS x 106) = 300x106/27.6x106 = 11 secs

MNFP Extime = 2760x106/50x106 = 55.2 secs.

MIPS can be a flawed/misleading performance measure

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5.38 on page 339,

CPI=(.21)(5)+(.12)(4)+(.46)(4)+(.21)(3)

CPI=(.21)(5)+(.12)(4)+(.46)(4)+(.21)(3)