作者zptdaniel ()
看板TransCSI
標題Re: [問題] 計概memory計算
時間Thu Apr 30 18:12:10 2009
※ 引述《sky810675 (KKMAN)》之銘言：
: A multiprogramming OS uses paging. The available momory is 32KB divided into 8
: frames, each of 4 KB. The first program needs 5 KB. The second needs 8KB.
: The third program needs 14KB.
32/4 = 8(frames)
: a.how many frames are used by the first program?
4KB = 1 frame < 5KB < 8KB = 2 frames(其中有3KB未使用)
: b.how many frames are used by the second program?
8KB = 2*4KB = 2 frames
: c.how many frames are used by the third program?
12KB = 3fremes < 14KB < 16KB = 4 frames(其中2KB未使用)
: d.how many frames are unused?
unused = total - used = 8 - (2+2+4) = 0
: e.what is the total memory(in KB)wasted?
由a與b知有 3 + 2 = 5KB
: f.what percentage of memory (in %)is wasted?
5KB/32KB = 0.15625 = 15.625%
: 這邊附上解答,幫忙解說一下過程怎麼做吧~謝謝囉
: a.2 b.2 c.4 d.0 e.5KB f.15.625%
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