Answered Essay: Two single core processors, P1 and P2, have different architectures. P1 runs at 3.4GHz and costs $100.

Two single core processors, P1 and P2, have different architectures. P1 runs at 3.4GHz and costs $100. P2 runs at 2.6GHz and costs $100. We can use two different compilers for these processors. For a specific benchmark program, compiler A generates 7000 instructions with an effective CPI of 1.2 for P1 and 1500 instructions and CPI of 2.2 for P2. Compiler B generates 5000 instructions with a CPI of 1.5 for P1 and 1000 instructions with a CPI of 4.0 for P2.

What is the best compiler-processor combination?

Expert Answer

Let me summarize the given question into tabular form for better understanding:

Now, considering execution time of the program as the performance metric, where

seconds/program = ((instructions/program)*(clock cycles/instructions)*(seconds/clock cycle))

We have,

Processor P1 for compiler A:

7000*1.3/3.4*10⁹ = 2.47*10^-6 seconds/program

Processor P1 for compiler B:

5000*1.5/3.4*10⁹ = 2.20*10^-6 seconds/program

Processor P2 for compiler A:

1500*2.2/2.6*10⁹ = 1.26*10^-6 seconds/program ——–> Best Combination

Processor P2 for compiler B:

1000*4.0/2.6*10⁹ = 1.53*10^-6 seconds/program

Seeing above, we can easily conclude that combination of processor P2 and compiler A has lesser execution time, thus this is the best compiler-processor combination.

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