![](https://i.imgur.com/93zC2HA.jpg)
Re: [理工] 資工 台大 93 計系 os
![](https://i.imgur.com/93zC2HA.jpg)
: 第5 (a)題
: 圖中最下面的(a)小題
: 他說用3 level 每個page access 都
: 會有0.01%的page fault 難以下筆……
: page fault 的 effective mem access
: 混multi level 一起考 我不會寫
: 煩請大大求助
: 感謝
首先如果都沒有MISS的機率是 (0.9999)^4,
而其所需之時間是 (50ns*4),
然後一個MISS的是 C(4,1)*(0.9999)^3*0.0001,
所需時間是 (50ns*3+1ms),
兩個MISS是 C(4,2)*(0.9999)^2*(0.0001)^2,
所需時間是 (50ns*2+1ms*2)
三個MISS是 C(4,3)*0.9999*(0.0001)^3,
所需時間是 (50ns+1ms*3)
四個都是 MISS 是 C(4,4)*(0.0001)^4,
所需時間是 (1ms*4)
全部加起來應該就是題目所求了。
以上是我的想法,不確定正確性,歡迎討論!
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