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软考备考 #4

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zhangwt-cn opened this issue Jul 19, 2023 · 0 comments

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计算机考试

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zhangwt-cn commented Jul 19, 2023 •

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计算机基础

页式存储计算
- 给出页大小和逻辑地址，计算出物理地址
  因为逻辑地址=页号+页内地址，物理地址=块号+页内地址，页大小二进制位数=页内地址位数，将二进制逻辑地址去页内地址位数就能得到页号，通过页号找到块号，得到物理地址。
```
也可以通过计算方式
若给定一个逻辑地址空间中的地址为A，页面大小为L，则
页号P = INT[A/L]
页内地址d = [A] MOD L
```

文件索引计算
文件索引具有直接地址、1～n级索引的方式，通常给出块大小和索引地址大小，计算存储位置。

索引表大小 = 块大小/索引地址大小
索引表开始位置=上一个位置+1
索引表结束位置=索引表大小+索引表开始位置-1
存储文件最大值=所有地址项数量x块大小

zhangwt-cn added the 计算机考试 label

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