作者nowar100 (抛砖引玉)
看板Grad-ProbAsk
标题Re: [理工] 计组
时间Wed Jun 17 22:27:47 2009
60 =>
45 +
15
45 / 5 =
9
9 +
15 = 24
60 / 24 = 2.5 效能改善了 2.5 倍
※ 引述《newfox ()》之铭言：
: Amdahl’s law
: (a) Describe the definition of Amdahl’s law.
: (b) Suppose we enhance a machine making all floating-point instructions
: run five times faster. If the execution time of some benchmark before the
: floating-point enhancement is 60 seconds, what will the speedup be if
: three-forth of the 60 seconds are spent executing
: floating-point instructions?
: 我有问题的是第二题，谢谢
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