test2

一、选择题：

1、可变分区存储管理系统中，若采用最佳适应分配算法，“空闲区表”中的空闲区可按（）顺序排列。

A、长度递增

B、长度递减

C、地址递增

D、地址递减

2、系统“抖动”现象的发生是由（）引起的。

A、交换的信息量过大

B、置换算法选择不当

C、内存容量不足

D、请求分页管理方案

3、可变分区管理中，首次适应分配算法可将空闲区表中的空闲区栏目按（）顺序排列。

A、地址递增

B、长度递增

C、地址递减

D、长度递减

4、可变分区方式常用的主存分配算法中，（）总是找到能满足作业要求的最大空闲区分配。

A、最佳适应算法

B、首次适应算法

C、最坏适应算法

D、循环首次适应算法

5、页面置换算法中（）不是基于程序执行的局部性理论。

A、先进先出调度算法

B、LRU

C、LFU

D、最近最不常用调度算法

6、文件系统中用（）来管理文件。

A、作业控制块

B、外页表

C、目录

D、软硬件结合的办法

7、下列文件全属于物理文件的是( )。

A、流式文件、串联文件

B、索引文件、记录式文件

C、流式文件、记录式文件

D、顺序文件、索引文件

8、存储设备与存储器之间进行信息交换的物理单位是（）。

A、卷

B、块

C、文件

D、记录

9、位示图可用于( )。

A、从磁盘空间的分配和回收

B、页式虚存中的页面置换

C、固定分区的存储管理

D、动态分区存储管理中空闲区的分配回收

10、磁头在移动臂带动下移动到指定柱面所花的时间是（）。

A、寻找时间

B、延迟时间

C、传送时间

D、优化时间

二、填空题：

1、在存储器管理中，页是信息的_________单位，段是信息的__________单位。页面大小由__________确定，段的大小由____________确定。

2、段页式存储管理兼顾了在逻辑上清晰和存储管理上方便的优点。

3、在分页存储管理方式中，当要按照给定的逻辑地址进行读/写时，需要次访问内存。

4、所谓虚拟存储器是指具有功能和功能，能从上对内存容量进行扩充的一种存储器系统。

5、文件系统采用两级索引分配方式，如果每个磁盘块的大小为1KB，每个盘块号占4个字节，则在该系统中，文件的最大长度是。

6、为了解决文件系统的不一致问题，一些计算机带有一个实用程序以检验文件系统的一致性。系统启动时，特别是崩溃之后重新启动，可以运行该程序。一致性检查分为两种：

和。

三、简答题：

1、交换扩充了内存，因此，交换也实现了虚拟存储器。这句话对吗？

2、目前最广泛采用的目录结构是哪种？它有什么优点？

四、解答题：

1、在分页虚拟存储管理系统中，假定系统为某进程分配了四个主存块（将开始4页先装入主存），页的引用顺序为：7，1，2，0，3，0，4，2，3，0，3，2，7，0，1，若采用FIFO 调度算法、LRU调度算法时分别产生多少次缺页中断？依次淘汰的页分是什么？

2、某采用分页存储管理的系统中，物理地址占20位，逻辑地址中页号占6位，页大小为1KB，问：该系统的内存空间大小为多少？每块的大小为多少？逻辑地址共几位，每个作业最大长度为多少？若0页放在3块中，1页放在7块中，2页放在9块中，逻辑地址0420H 对应的物理地址是多少？

3、系统中磁头停留在磁道号为70的磁道上，这时先后有4个进程提出了磁盘访问请求，要访问的磁盘的磁道号按申请到达的先后顺序依次为：45,68,28,90。移动臂的运动方向：沿磁道号递减的方向移动。若分别采用FCFS磁盘调度算法、SSTF算法，SCAN算法算法时，所需寻道长度分别为多少（走过多少柱面）

4、假定有一个磁盘组共有199个柱面，每个柱面上有16个磁道，每个盘面被划分成8个扇区。现有一个含有700个逻辑记录的文件，逻辑记录的大小与扇区大小一致，该文件以顺序结构的形式被存放到磁盘上。柱面、磁道、扇区的编号均从“0”开始，逻辑记录的编号也从“0”开始。该文件信息从1柱面、5磁道、0扇区开始存放，试问：

①该文件的第380个逻辑记录应存放在哪个柱面的第几磁道的第几个扇区?

②第2柱面的第1磁道的第7扇区中存放了该文件的第几个逻辑记录?

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