You designed your CPU in smartphone can offer two different modes: High Temperat

Question

You designed your CPU in smartphone can offer two different modes: High Temperature Mode and Room Temperature Mode. In High TemperatureMode, CPU’s operating voltage and clock frequency will be lower than the Room TemperatureModeto increase the stability.

even in hot environment. Instruction Cycles Per Instruction Instruction counts Operating Voltage Room High Temperature Temperature Mode Mode Clock Frequency Room High Temperature Temperature Mode Mode Arithmetic million Branch million 2.8GHz 1.4GHz Load/Store a) [5pts] Calculate Average CPI of this CPU. b) (5pts) Calculate the CPU times for two different modes

Explanation / Answer

Solution:

Total instruction count= 3+1+6 = 10 million

There percentage will be

Arithmetic=> 3/10 = 30 %

Branch=> 1/10= 10%

Load/Store=> 6/10= 60%

Now the

Average CPI = 5*0.3 + 3*0.1 + 4*0.6= 4.2

b)

For high temprature the execution time is= (10 * 10^6 * 4.2) / (1.4*10^9)= 0.03 sec or 30 ms

For Room temprature the execution time is= (10 * 10^6 * 4.2) / (2.8*10^9)= 0.015 sec or 15 ms

c)

energy consumption=>

Room temprature

Power = frequency * voltage^2

= 1.8^2 * 2.8 * 10^9 = 9.072 unit

High Temprature

= 1 * 1* 1.4 = 1.4 unit

Room Temp is consuming more power which is by 9.072/1.4= 6.48 times.

I hope this helps if you find any problem. Please comment below. Don't forget to give a thumbs up if you liked it. :)

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