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jonny [76]
3 years ago
11

Suppose that we are developing a new version of the AMD Barcelona processor with a 4 GHz clock rate. We have added some addition

al instructions to the instruction set in such a way that the number of instructions has been reduced by 15%. The execution time is reduced to 700 s. Find the new CPI.
Computers and Technology
1 answer:
bixtya [17]3 years ago
6 0

Question:

Barcelona has an instruction count of 2.389E12, an execution time of 750 s, and a  reference time of 9650 s.

Answer:

New CPI is 1.379

Explanation:

Given:

Clock Rate=4 GHz

Reduction in number of instructions=15%

Execution time=700 sec

Instruction Count=2.389*10^{12}

Find:

New CPI=?

Solution:

Cycle Time=1/Clock Rate

Cycle\ Time= 0.25*10^{-9} sec

Execution Time= Clock cycles * Cycle Time

Clock Cycles=Execution Time/Cycle Time

Clock Cycles=\frac{700}{0.25*10^{-9}}

Clock\ Cycles= 2.8*10^{12}

New Instruction Count=2.389*10^{12}*0.85

New Instruction Count=2.03*10^{12}

CPI=\frac{Clock\ Cycles}{New\ Instructions} \\CPI=\frac{2.8*10^{12}}{2.03*10^{12}} \\CPI= 1.379

New CPI is 1.379

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