题目详情

利用不同基准测试程序对计算机系统进行测试可能会得到不同的性能评价结果,对这些评价结果进行统计和比较分析,可以得到较为准确的接近实际的结果。在性能评价中,持续性能最能体现系统的实际性能。下列选项中,(  )不是常用的表示持续性能的计算方法。

  • A.几何性能平均值Gm
  • B.算术性能平均值Am
  • C.卷积性能平均值Cm
  • D.调和性能平均值Hm

正确答案及解析

正确答案
C
解析

表示持续性能常用的三种平均值是算术平均、几何平均和调和平均。

(1)算术性能平均值就是简单地把n个程序组成的工作负荷中每个程序执行的速率(或执行所费时间的倒数)加起来求其对n个程序的平均值。

(2)几何性能平均值就是各个程序的执行速率连乘再开n次方得到的结果。

(3)调和性能平均值就是算出各个程序执行速率倒数(即执行时间)和的平均值的倒数。

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