作者christensen ()
看板Grad-ProbAsk
标题[理工] 计组效能请教
时间Wed Apr 8 18:28:53 2009
Suppose you wish to run a program P with 7.5x10^9 instructions on a 5GHz
machine with a CPI of 0.8.
a)What is the expected CPU time? 我算出来是1.2 想请问答案对吗?
b)When you run P, it takes 4 seconds of wall clock time to complete.
What is the percentage of the CPU time P received?
请问b小题怎麽算啊? 我不懂它的意思耶
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1F：推 MysterySW:第一题对 第二题就1.2/(1.2+4) 04/09 01:34
2F：→ MysterySW:因为CPU除了执行指令外还会去作别的工作 像是IO之类的 04/09 01:34
3F：→ MysterySW:题目问CPU在执行P时所占时间的百分比 04/09 01:35