考虑一个6级指令流水线，其中所有级都是完美平衡的，假设没有流水线的周期时间开销。当应用程序在此6级流水线上执行时，如果25％的指令产生2个流水线停顿周期，则相对于非流水线执行的加速为
(A) 4
(B) 8
(C) 6
(D) 7答案： (A)
解释：
It was a numerical digit type question so answer must be 4.
As for 6 stages, non-pipelining takes 6 cycles.
There were 2 stall cycles for pipelining for 25% of the instructions
So pipe line time = (1+(25/100)*2) = 1.5
Speed up = Non pipeline time/Pipeline time = 6/1.5 = 4这个问题的测验