[理工] [記組]-CPI
Consider three different processors P1,P2,P3 excuting the same instruction set
with the clock rates and CPIs given in the following table.
Processor Clock rate CPI
P1 2 GHz 1.5
P2 1.5 GHz 1.0
P3 3 GHz 2.5
Q1.If the processors each excute a program in 10 seconds,find the number of
cycles and the number of instructions.
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我只知道
P1:1.5=C/I,但兩個未知數根本解不出來
Q2.We are trying to reduce the time by 30% but this leads to an increase of 20%
in the CPI.What clock rate should we have to get this time reduction?
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題目我就有點看不懂了reduce the time by 30%是指說假設我現在要花10秒,那我就必須變
成7秒,還是3秒?
另一個困擾,對我而言
0.7=(I/Program)*0.8*(seconds/cycles)
有未知數不知來自哪?
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