Cpu time

Question

Find CPU time of computer with 500 MHz and following class distribution for program with 100 instructions.

Class       CPI       Frequency

1                3         40%

2               5         20%

3               3         30%

4               1        10%

 

Ans: 640ns

Comments

Yes
640ns.

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Cpu time (execution time)=$\sum( instruction\; count*CPI)*cycle\; time$

Cycle time =$\frac{1}{500MHz}=2ns$

                                Cpu time   =(40*3+50*2+30*3+10*1)*2ns=640ns

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Oh I was calculating for single instruction :P