[理工] [OS]-交大98-資工所

[assassin88 (AI)]

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.

請問一下這題答案是什麼..我是寫(C)(E)，
不過(A)(B)(D)沒有保握..可否解釋一下~感謝

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◆ From: 61.57.105.193
※ 編輯: assassin88      來自: 61.57.105.193        (12/26 22:15)
推 chenbojyh:我有買鼎茂出的解答 上面是寫ACE 但是這題沒寫詳解
→ assassin88:這..請問你有研究了嗎XDD
推 chenbojyh:STILL考生ing   XDDD
推 chenbojyh:我還沒研究耶 > <   計組 OS是我目前最弱的兩科
→ taitin:A讀取時可先載入buffer，下次再讀時就可把buffer當作cache
→ taitin:B.如果已經同步的話，多一個cache要多寫入時間，沒比較快
→ taitin:D.usually use memory(用在增進磁碟讀取，當然不會再用磁碟