使用Cache改善系统性能的依据是程序的局部性原理。程序中大部分指令是( )的。设某计算机主存的读/写时间为100ns,有一个指令和数据合一的Cache,已知该Cache的读/写时间为10ns,取指令的命中率为98%,取数的命中率为95%。在执行某类程序时,约有1/5指令需要额外存/取一个操作数。假设指令流水线在任何时候都不阻塞,则设置Cache后,每条指令的平均读取时间约为( )ns。
问题1选项
A.顺序存储、顺序执行
B.随机存储、顺序执行
C.顺序存储、随机执行
D.随机存储、随机执行
问题2选项
A.12.3
B.14.7
C.23.4
D.26.3
正确答案及解析
正确答案
解析
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