考虑一个具有四个阶段(S1、S2、S3 和 S4)的指令流水线，每个阶段都只有组合电路。每个阶段之间和最后一个阶段结束时都需要流水线寄存器。各阶段和流水线寄存器的延迟如图所示：
与相应的非管道实现相比，理想条件下管道在稳态下的近似加速是多少?
(一) 4.0
(乙) 2.5
(三) 1.1
(四) 3.0答案：(乙)
解释：
Pipeline registers overhead is not counted in normal
time execution
So the total count will be
5+6+11+8= 30 [without pipeline]
Now, for pipeline, each stage will be of 11 n-sec (+ 1 n-sec for overhead).
and, in steady state output is produced after every pipeline cycle. Here,
in this case 11 n-sec. After adding 1n-sec overhead, We will get 12 n-sec
of constant output producing cycle.
dividing 30/12 we get 2.5 这个问题的测验