1. Compare the performance of the two computers: Computer A: CPI=1.2 #instructio
ID: 3758768 • Letter: 1
Question
1. Compare the performance of the two computers:
Computer A: CPI=1.2 #instructions=100 Clock rate=2GHz
Computer B: CPI=1.5 #instructions=120 Clock rate=2.2GHz
Which machine is faster and by how much [how many times faster]?
2. Assume the following performance measurements for a program:
Measurement
Computer A
Computer B
Instruction Count
10 billion
8 billion
Clock Rate
4 GHz
4 GHz
CPI
1.0
1.1
a) Which computer has the highest MIPS rating? IPS = Hz/CPI
b) Which computer is faster? Calculate the execution time for each computer, and performance differential.
Measurement
Computer A
Computer B
Instruction Count
10 billion
8 billion
Clock Rate
4 GHz
4 GHz
CPI
1.0
1.1
Explanation / Answer
1)
computer A
it will be CPI * instruction * time
time = 1/2ghz = 500 ps
500 * 100 * 1.2 = 60,000 ps
computer B
time = 1/2.2ghz = 454 ps
1.5 * 120 * 454 = 81720
so computer B is faster in performance. It is higher in performance by 81720/60000 = 1.362
2)
a)
computer A has higher mips rating(4/1) compared to B (4/1.1)
b)
computer A is faster has clock rate is same but CPI * instruction count is more for computer A then B.
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