作者yesa315 (XD)
看板Grad-ProbAsk
标题[理工] [OS]-working set
时间Tue Dec 29 11:14:59 2009
25.(2%)Which of the following statements is incorrect regarding virtual
memory management?
(A)Working set model can help control the level of multiprogramming.
(B)When a process is not allocated enough frames to contain its working set,
performance may drop drastically.
(C)OS checks the program of each process to calculate its working set for the
duration of the process execution.
(D)Locality of memory reference is crucial to the performance of virtual
memory management.
(E)The copy-on-write strategy can save precious time in process creation.
题库答案给A 有另一版给E<-错很大
但我认为是B 原因是只有一个process frames不够时 并不会造成效能剧烈下降
多个process frames不够时 才会
不知有没有人跟我见解一样?
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1F：→ chris750630:是复选题嘛？ 12/29 11:57
2F：推 Jimmy0301:可是一个不够，有可能去抢其他人的，造成别人page fault 12/29 13:33
3F：→ Jimmy0301:就有可能产生thrashing，这是我的想法不知道对不对 12/29 13:34
4F：→ chris750630:我也认为B是对的 在於 may 这字上.... 12/29 13:53
5F：→ yesa315:单选题 (A)课本写D<M 可以初始化其他process 应该可以控制 12/29 14:45
6F：→ yesa315:感觉没那麽对的 所以猜B 12/29 14:46
7F：推 assassin88:答案不是E吗= =? copy-and-write功能不是那个阿~!? 12/29 14:57
8F：→ yesa315:为了节省fork出child的时间 让parent与child最共享page 12/29 15:22
9F：→ yesa315:这是使用copy-on-write的原因 12/29 15:23