作者ceo890710 (Drinking)
看板Grad-ProbAsk
標題[理工] [計組] 97中山資工
時間Sat Sep 17 23:20:11 2011
Modified version of Processor B,a new instruction Ix is invented to replace
instructions Iy and Iz whenever Iy and Iz appear in sequence.However,this
modification reduces clock rate to 450 MHz,while the CPI is not affected.
Assume that in the program given in Problem4.1,there are 200 million Iy
instructions followed by Iz.What is the execution time if the program is
executed in the new processor?Does the modification improve performance?
我想問的是new instruction count為什麼是4-0.2 = 3.8
謝謝!!
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推 jim055006:因為一開始題目給ProcessB的IC為4billion 09/18 00:40
→ jim055006:而Ix可以取代取代Iy跟Iz指令... 09/18 00:42
→ jim055006:所以4000*10^6-200*10^6=3800*10^6.....其中指令被壓縮 09/18 00:43
→ jim055006:所以才減200*10^6 09/18 00:44
→ ceo890710:Iy instructions followed by Iz我不太懂這句表達的意思 09/18 08:01
→ ceo890710:如果只是取代的話，我知道意思.只是上面那句搞亂我了.. 09/18 08:03