[理工] [OS]-成大96 資工

[lovefo (lovefo)]

Suppose that the head of a moveing-head disk with 150 tracks,numbered 0 to
149,is currently serving a request at track 120 and has just finished a
request at track 115.The queue of requests is kept in FIFO order:
            89,110,20,45,139
Write down the total number of head movements
for (1)FCFS (2)SCAN (3)LOOK (4)SSTF scheduling,respectively.

這是96成大OS
應該很多人都算過了
我買的解答只給怎麼解 沒給答案XD

有興趣的大大是不是能幫我核對看看
這部份錯很大

(1)261
(2)178
(3)158
(4)209

謝謝

--
一切....
似乎不再那麼重要....

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◆ From: 114.46.165.166
推 dendrobium:261 158 138 219
※ 編輯: lovefo          來自: 125.230.14.194       (02/28 12:42)
推 qpalwosk:SCAN: (149-120)+(149-20)  LOOK: (139-120)+(139-20)
→ qpalwosk:SSTF: (120-110)+(110-89)+(89-45)+(45-20)+(139-20)
推 ChrismasTick:我的答案也跟一樓的一樣耶