614 A program is run on a computer with the following parame

[6.14] 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? (Hint: First calculate CPI)

A)14

B)1.4

C)71.4

D)54

Solution

Answer :

Calculate CPI :

.................

Clocks per Instruction(CPI)=(70/100)*1 + (20/100)*2 + (10/100)*3=0.7+0.4+0.3=1.4

MIPS

.........

MIPS rating=Clock Rate/(CPI * 10^6)

                  =100 * 10^6 / (1.4 * 10^6)

                   =71.4

Answer : C)71.4