作者assassin88 (AI)
看板Grad-ProbAsk
标题[理工] [OS]-交大98-资工所
时间Sat Dec 26 22:14:05 2009
Which of the following statement(s) is/are correct for the buffer cache
mechanism for a file system?
(A)The read performance can be improved by enabling buffer cache.
(B)User process sees fast writes if synchronous writes and buffer cache are
both enabled.
(C)The number of both read and write I/O requests to the dish drive can be
reduced.
(D)Buffer cache mechanism is usually implemented on the disk drive.
(E)The performance of the file system can be always improved by incressing the
size of buffer cache.
请问一下这题答案是什麽..我是写(C)(E)，
不过(A)(B)(D)没有保握..可否解释一下~感谢
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◆ From: 61.57.105.193
※ 编辑: assassin88 来自: 61.57.105.193 (12/26 22:15)
1F：推 chenbojyh:我有买鼎茂出的解答 上面是写ACE 但是这题没写详解 12/26 23:49
2F：→ assassin88:这..请问你有研究了吗XDD 12/27 14:13
3F：推 chenbojyh:STILL考生ing XDDD 12/27 17:39
4F：推 chenbojyh:我还没研究耶 > < 计组 OS是我目前最弱的两科 12/27 17:59
5F：→ taitin:A读取时可先载入buffer，下次再读时就可把buffer当作cache 01/15 23:18
6F：→ taitin:B.如果已经同步的话，多一个cache要多写入时间，没比较快 01/15 23:19
7F：→ taitin:D.usually use memory(用在增进磁碟读取，当然不会再用磁碟 01/15 23:21