svarner2001
26.12.2019 •
Computers and Technology
Assume that we have an application with a total of 500,000 instructions where 20% of them are the load/store instructions with an average cpi of 6 cycles, and the rest instructions are alu instructions with average cpi of 1 cycle. if we double the clock rate without optimizing the memory latency, the average cpi for load/store instruction will also be doubled to 12 cycles. what is the speedup after this change?
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Ответ:
1.25
Explanation:
#instructions =
Average CPI (old) = 0.2*6 + 0.8*1 = 1.2+0.8 = 2.0
Average CPI (new) = 0.2*12 + 0.8*1 = 2.4 + 0.8 = 3.2
Assuming Clock Rate = x
Speedup = Execution Time (old) / Execution time (new) = (2.0*5*
/x) / (3.2*5*
/2x) = 4/3.2 = 1.25
Ответ:
True
False
True