流水线的吞吐率是指单位时间流水线处理的任务数，如果各段流水的操作时间不同，则流水线的吞吐率是（ ）的倒数。
- A.最短流水段操作时间
- B.各段流水的操作时间总和
- C.最长流水段操作时间
- D.流水段数乘以最长流水段操作时间
正确答案及解析
正确答案
解析
流水线处理机在执行指令时，把执行过程分为若干个流水级，若各流水级需要的时间不同，则流水线必须选择各级中时间较大者为流水级的处理时间。
理想情况下，当流水线充满时，每一个流水级时间流水线输出一个结果。
流水线的吞吐率是指单位时间流水线处理机输出的结果的数目，因此流水线的吞吐率为一个流水级时间的倒数，即最长流水级时间的倒数。
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