A program is run on a computer with the following parameters
clock cycle time 10 ns
instructions with 1 cycle 70%
instructions with 2 cycles 20%
instructions with 3 cycles 10%
What is the MIPS rating of this computer?
Average CPI = 0.70 × 1 + 0.20 × 2 + 0.10 × 3 = 0.70 + 0.40 + 0.30 = 1.40 CPI
If the clock cycle is 10ns, the average instruction takes 1.40 × 10 ns = 14 ns.
The number of instructions per second is 1/14ns = 109 × 1/14 = 1000/14 MIPS = 71.4 MIPS.
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