Operating system memory management choice problem refining

1, in the section page storage management, its virtual address space is ()

A, one-dimensional B, two-dimensional C, three-dimensional D, level

Answer: B

2, using () does not produce internal fragmentation ("internal fraction")
A, paging storage management                                                                 B, segmented storage management  
C, fixed-partition storage management                                                         D, section-page Storage Management
Answer: B
3, Section page manages each fetch of data to access () secondary memory.

A, 1 B, 2 C, 3 D, 4

Answer: C

4. Segment Management provides (B) The address structure of the dimension.

A, 1                        b, 2                                   c, 3                                 D, 4

Two-dimensional logical address: segment number + intra-paragraph address
The main differences between pagination and segmentation:
1), paragraph is the logical unit of information, it is divided according to the needs of users, so the segment is visible to the user, the page is the physical unit of information, is to manage the main memory of the convenience and division, the user is transparent.
2), the size of the page is fixed, determined by the system. The size of the segment is not fixed, it is determined by the function it completes.
3), paragraph type to provide users with a two-dimensional address space, the page to provide users with a one-dimensional address space, the page number and page offset is the function of machine hardware.
4), because the paragraph is the logical unit of information, so it is convenient for storage protection and information sharing, page protection and sharing is limited.

Paging and segmented storage management systems although similar in many places, conceptually, the two are completely different, the difference between them is as follows:
The ① page is the physical unit of information. The purpose of paging is to achieve discrete distribution, reduce external fragmentation, and improve memory utilization. A segment is a logical unit of information. Each segment is logically a set of relatively complete sets of information.
The job address space for ② paging storage management is one-dimensional, while the job address space for segmented storage management is two-dimensional.
The size of the ③ page is fixed and determined by the system, which is equal length. And the length of the paragraph is variable.
The advantages of ④ are embodied in the management of memory space, while the advantages of segmentation are embodied in the management of address space.

5, () storage management mode provides two-dimensional address structure.

A, fixed partition B, pagination C, segmented D, variable partition

Answer: C

6, () storage management mode provides one-dimensional address space.

A, fixed partition B, segment C, pagination D, segment, and Segment page type

Answer: A
7. The following () storage management methods can make storage fragmentation as small as possible, and make memory utilization higher.

A, fixed partition B, variable partition C, paging Management D, section page management

Answer: D

8, paging management each fetch a data, to access () secondary memory.

A, 1 B, 2 C, 3 D, 4

Answer: B

9, the channel is a ().

A, I/O port B, data channel C, I/O processor D, software tools

Answer: C

10, the data transfer between the disk and the host is ()

A, unconditional B, program query C, interrupt mode D, DMA mode

Answer: D

11, in a Request page-type storage management, a program of the page to 4, 3, 2, 1, 3, 5, 4, 3, 2, 1, 5, and the use of LRU algorithm. The number of storage blocks allocated to the program is 3 and 4, respectively, and the number of missing pages in the access F and the fault rate F is (B)

A.①m=3,f=8, F≈67%②m=4,f=5, f≈42%

B ①m=3,f=10, F=83%②m=4,f=8, f≈67%

C ①m=3,f=9, F≈75%②m=4,f=io, f≈83%

D ①m=3,f=7, F≈58%②m=4,f=6, f=50%

12. The essential difference between process and procedure is (D)

A, stored in memory and external memory B, sequential and non-sequential execution of machine instructions

C, timeshare use and exclusive use of computer resources D, dynamic and static features

13. The only entity of the system-aware process is (C)

A, JCB B, FCB C, PCB D, SJT

14, spooling technology used in (B)

A, peripheral concept B, virtual device concept C, tape concept D, storage concept

15, (a) is the direct access device.

A, disk B, tape C, printer D, keyboard display terminal

16, using the spool technology, a part of the disk as a public buffer to replace the printer, the user's operation on the printer is actually a storage operation on the disk, in lieu of the printer part refers to ()

A, exclusive device B, shared device C, virtual device D, general physical device

Answer: C

17. The advantage of mobile technology in variable partition storage management is ()
A, increase main memory capacity B, shorten the access period C, accelerate address translation D, centralized idle area
Answer: D
18. The use of the bit diagram is ()

A, the main memory space sharing B, File Protection and encryption C, disk space management D, file directory lookup
Answer: C
19, in the virtual device, when the user job to enter the system, the spooling system by the pre-input program to send the job information from the physical input device to ()
A, memory B, input well C, output well D, Channel
Answer: B

Operating system memory management choice problem refining