单项选择题

The time that the CPU spends on a given program can be computed using all of the following expressions except( ).

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单项选择题
由于更换了CPU，使计算机的运行速度提高了5倍，然而增强比占到80％，该机器的总加速比为( )。
A．0.78
B．1.78
C．2.78
D．3.78
单项选择题
You are performing two sums, the first is a sum of two scalar variables and the second is a matrix sum of a pair of two— dimensional arrays—size 1000 by 1000. What speedup is achieved when the calculations are performed on size 1000 processors ( )
A．50
B．100
C．999
D．none of the above
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