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* Performance

Performance = 1/Execution Time

Seconds/Program = (Instructions/Program)  *  (Cycles/Instruction)  *  (Seconds/Cycle)

-> CPI                    -> Cycle time (cf. Cycles/Second -> Clock rate)

즉, CPU Time = CPU Clock Cycles * Clock Cycle Time (= CPU Clock Cycles/Clock Rate)

Cock Cycles = Instruction Count * Cycles per Instruction

그러므로ㅋㅋㅋ 

CPU Time = Instruction Count * CPI * Clock Cycle Time

               = (Instruction Count * CPI) / Clock Rate

즉...!!!

CPU Time은 인스트럭션에 CPI에 클락 싸이클 타임을 곱한 것! (또는 클락 싸이클 타임을 곱하는 것 대신 클락 레이트로 나누는 것)