December
1998 QUESTION 5 Total Marks: 20 Marks |
Click here to access other
questions
Click to access
|
| (a) | With the aid of a diagram, explain the concept
of memory hierarchy, showing how the characteristics of cost, capacity, access
time and performance vary with the different sorts of memory.
|
[4] |
| There are several techniques of implementing
virtual memory such as overlays and segmentation. Paging is by far the most effective
technique.
|
||
| (b) | Explain what is meant by "virtual
memory".
|
[2] |
| (c) | Define the term "page table".
|
[2] |
| (d) | With the aid of an appropriate diagram,
describe how paging works. Include a definition of the term "page fault"
|
[6] |
| (e) | Give reasons why the page size in a virtual memory system should neither be too big or too small | [6] |