助教您好：
請問一下喔，我有一個處理Optimal Page Replace Algorithm的問題：
若目前的三個page frame裡面分別存有[2 0 1]三個資料，然後reference string
剩下(7 0)，那請問哪一個page frame裡面的資料要被replace掉呢？因為第一個
page frame與第三個page frame裡面的資料已經不會在reference string出現了，
這樣就有兩個page frame符合課本的定義可以被replace掉，那要replace哪一個呢？
謝謝助教的回答，祝聖誕快樂 :)

看你那時指標指向哪邊
就replace哪邊....應該沒有一定的標準吧.:)

Optimal Page Replacement:
Replace the page that will not be used
for the longest period of time.
這個algorithm是要去找未來最久不會被用到的，
跟指標沒關係吧？哪來的指標呢？

對阿對阿 有問題ㄟ

如果是要FIFO的話 還要紀錄他是哪時候進來
不然的話 就要用像second chance一樣的方法(也就是指標)
在不然的話 就以frame的number小的先replace(也就是從頭找)
這三種方法的答案都會不同

請助教決定一種方法吧~~~~~~~

我覺得採用指標去循環比較好..:)

我覺得採用指標去循環比較好..:)

But I think using one more pointer is meaningless,
you still have to search all of the page frames
then you can make your decision. This way is not
better than searching from the page whose number
is smallest. Just two different methods, no better,no worse.

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