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It depends on the <span>mapping techniques. Do you have a particular one in mind. The options are associative mapping, direct mapping and set associative mapping.</span>
Answer:
2125 ns.
Explanation:
First of all Execution Time = Number of Instructions * CPI * Clock Cycle
Number of Instructions = 1000
CPI = 0.5
Clock Cycle = 1/clock rate = 1/4GHz = 0.25 * 10-9 s
So Execution Time = 1000 * 0.5 * 0.25 * 10-9
Execution Time = 125 * 10-9 s
Execution Time = 125 ns
Now 20% of the instructions take 10 ns extra time for remote communication.
1 instruction takes 10ns
so 20% of 1000 = 200 instructions will take 200*10 = 2000ns
So Total Execution Time = 125+2000 = 2125 ns.
