Question

Consider three different processors P1, P2 and P3 executing the same instruction set. P3 has a 4 GHz clock rate and a CPI of 2.5. P2 has 3.5 GHz clock rate and a CPI of 2.0. P1 has a 5.0 GHz clock rate and has a CPI of 3.3. a. Which processor has the highest performance expressed in instructions per second? b. If the processor each execute a program in 5 seconds, find the number of cycles and the number of instructions.

Answer 1

ons a) l₂: Clock rate - 4GHz - CPI = 2.5 Performance Clockrate Instruction CAL чCh len Aecond - 1.6 X 109 Instruh, les de cond. f.: Clock rete 3.5 Goltz CHE = 20 Performance = 3.5 GHz 2.0 < 175 X 109 Instru'm fer second » Clock ratez sioltz Cif = 3.3 Performance = 5.0 GHz 3.3 = 1.67X10 Instruction Perdecond So Processor P₂ had the highest for formance among the three. Cylles Execution time. 5 sec. l: clicle = Checa We ² Execution Time = 43. = 2x100 lycles Cylle = Clock Ratex Executin time = 3.575 = 17: 5 0 = 1.75xlos ciele Cycle clock love * Execution time 165x 10 = 1.65x101 cyllen.

Number of in treation P3: > Number of Ind. = Clock hat * Executin time - 8x10 instreechin = 4 Gtx 5 23 No. of Int. - 3.5x5 bi 8.75 x 10 instruction P: No. of Ind. = 575 7.37 xlos Instruction,