Consider the following problem: You are the chief designer for the next generati
ID: 3571702 • Letter: C
Question
Consider the following problem: You are the chief designer for the next generation smart gadget. In order to work optimally, you need the fastest processor possible. Processor A has a clock rate of 2GHz and an average CPI of 2.0 Processor B has a clock rate of 8GHz, but the average CPI is 7. What is the cycle time of Processor A? Assume a program has 100 instructions, what is the CPU time for Processor A? What is the cycle time of Processor B? Assume the same program with 100 instructions, what is the CPU time for Processor B? Which is faster, and by how much? (What is the speed up?) *Do not subtract the 2 numbers and expect to get this right on the exam.Explanation / Answer
a)clock cycle timea
=(1/clock ratea)
=(1/2*109)
=0.5ns or 0.5 nanoseconds or 0.5*10-9s
c)clock cycle timeb
=(1/clock rateb)
=(1/8*109)
=0.125*10-9s or 0.125ns or 0.125nanoseconds
=0.5ns or 0.5*10-9s