作者mileslinyu (GGToy)
看板Non-Graduate
标题[问题] 请问有人会这一题OS/作业系统的题目？
时间Sat Jun 18 11:55:52 2011
Assume that we have a demand paging system.
It takes 4 milliseconds to read or write a page to disk.
90% accessing a page is already in memory,
and 70% page-table references are found in the TLBs(that is 0.63 totally),
and 50% modified bits are dirty (that is, 0.05 totally).
Memory access time is 2 microsecond. What is the effective access time per memory reference?
(assume that finding a page-table entry in the TLBs takes 0.1 microsecond).
Show how derive your answer.
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