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作業系統作業
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作業系統作業
1.
D 1 0
1 4 2 4 3 0 3 3 楊 怡 惠 作業系統作業
2.
如果記憶體有4個頁框,每個頁框的大小為200個位元組, 一個整數佔有2個位元組,其中一個頁框固定給下咧程式 碼使用。如果陣列是已列優先方式存放在記憶體中,則執 行此程式會發生多少次分頁錯誤,如果把程式碼A[I][J] 改成A[J][I],那麼會有多少次分頁錯誤? int A[100][100] for i=1
to 100 for j=1 to 100 A[i][j]=0;
3.
每一頁框大小為200位元組,有I、J兩個變數,所以200(位 元組)/2(變數)=100(整數),每個頁框能存取100個整數。 (1)變數i的迴圈每執行就會發生一次分頁錯誤,變數j的迴 圈每執行一次就會發生一次分頁錯誤;所以100*100=10000, 總共有10000次的分頁錯誤。 (2)當執行碼A[i][j]改成A[j][i]時,變數j的迴圈只發生一 次分頁錯誤,又因每個頁框能存取100個整數,所以 1*100=100,總共有100次的分頁錯誤。
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