[理工] [計概] Operating Systems

看板Grad-ProbAsk作者 (hare0204)時間13年前 (2011/02/21 00:27), 編輯推噓0(0推 0噓 3→)
留言3則, 3人參與, 最新討論串1/1
A monoprogramming operating system runs programs that on average need 10 microseconds access to the CPU and 70 microseconds access to the I/O desices. What percentage of time is the CPU idle? Ans: 87.5% 10跟70為什麼能算出87.5??? 沒有想法..QQ 請問大家..先謝了.. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.20.176.189 ※ 編輯: hare0204 來自: 61.20.176.189 (02/21 00:29)
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02/21 00:32, , 1F
70/(10+70)
02/21 00:32, 1F
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02/21 00:44, , 2F
算出來了耶..可是這樣的白話文意涵是..?_?"
02/21 00:44, 2F
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02/21 12:44, , 3F
做I/O的時間CPU什麼都不能做，所以I/O Time=CPU idle time..
02/21 12:44, 3F
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