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Suppose that we want to enhan

[问答题]

Suppose that we want to enhance the processor used for Web serving. The new processor is 10 times faster on computation in the Web serving application than the original processor. Assuming that the original processor is busy with computation 45% of the time and is waiting for I/O 55% of the time, what is the overall speedup gained by incorporating the enhancement?

人间卷王

这是一个amdahl's law 的题。 speed up = exe time old/exe time new = 1/(0.55+0.45/10)=1.68

参考链接：https://zhuanlan.zhihu.com/p/48022905

发表于 2021-04-01 20:01:14 回复(0)

UESTCICER

原始时间为100

由于IO等待时间不变

现在时间为45/10+55=59.5

所以速度提升为（100-59.5）/100=40.5%

发表于 2020-05-29 18:55:01 回复(0)

牛客536031135号

1/（4.5%+55%）= 1.68

the overall speedup gained is 68%

发表于 2020-07-15 16:45:25 回复(0)

一一并举风荷香

这是一个amdahl's law 的题。 speed up = exe time old/exe time new = 1/(0.55+0.45/10)=1.68

发表于 2019-11-20 08:58:27 回复(0)

牛客192708113号

new processor time needed：0.55+0.045=0.595

seedup： 40.5%

发表于 2021-04-03 12:58:11 回复(0)

简444

Consider that the new processor could only improve computation, so with new processor, computation time will be deduced to 4.5 time unit, so it shold be (100 - 4.5 - 55) / 100, improved by 40.5%

发表于 2019-06-03 22:02:19 回复(1)