作者yesa315 (XD)
看板Grad-ProbAsk
標題[理工] [OS]-working set
時間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.
題庫答案給A 有另一版給E<-錯很大
但我認為是B 原因是只有一個process frames不夠時 並不會造成效能劇烈下降
多個process frames不夠時 才會
不知有沒有人跟我見解一樣?
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→ chris750630:是複選題嘛？ 12/29 11:57
推 Jimmy0301:可是一個不夠，有可能去搶其他人的，造成別人page fault 12/29 13:33
→ Jimmy0301:就有可能產生thrashing，這是我的想法不知道對不對 12/29 13:34
→ chris750630:我也認為B是對的 在於 may 這字上.... 12/29 13:53
→ yesa315:單選題 (A)課本寫D<M 可以初始化其他process 應該可以控制 12/29 14:45
→ yesa315:感覺沒那麼對的 所以猜B 12/29 14:46
推 assassin88:答案不是E嗎= =? copy-and-write功能不是那個阿~!? 12/29 14:57
→ yesa315:為了節省fork出child的時間 讓parent與child最共享page 12/29 15:22
→ yesa315:這是使用copy-on-write的原因 12/29 15:23