Question 1 Suppose that the WSClock page replacement algorithm uses a tau (t) of ten ticks, and the system state is the following: Page Number Time stamp (time of last use) V R M 10 60 1 0 1 11 90 1 1 0 12 90 1 1 1 13 70 1 0 0 14 40 0 0 0 where the three flag bits V, R, and M stand for Valid, Referenced, and Modified, respectively. (a) If a clock interrupt occurs at tick 100 (current virtual time), show the contents of the new table entries. Briefly explain any changes. (You can omit entries that are unchanged.) (b) Suppose that instead of a clock interrupt, a page fault occurs at tick 100 due to a read request to page 14. Show the contents of the new table entries. Explain which page will be evicted, giving the changes made to that page in the table, and explain the changes made to page 14. (You can omit entries that are unchanged.)
Question 1 Suppose that the WSClock page replacement algorithm uses a tau (t) of ten ticks, and the system state is the following: Page Number Time stamp (time of last use) V R M 10 60 1 0 1 11 90 1 1 0 12 90 1 1 1 13 70 1 0 0 14 40 0 0 0 where the three flag bits V, R, and M stand for Valid, Referenced, and Modified, respectively. (a) If a clock interrupt occurs at tick 100 (current virtual time), show the contents of the new table entries. Briefly explain any changes. (You can omit entries that are unchanged.) (b) Suppose that instead of a clock interrupt, a page fault occurs at tick 100 due to a read request to page 14. Show the contents of the new table entries. Explain which page will be evicted, giving the changes made to that page in the table, and explain the changes made to page 14. (You can omit entries that are unchanged.)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question 1
Suppose that the WSClock page replacement
|
Page Number |
Time stamp (time of last use) |
V |
R |
M |
|
10 |
60 |
1 |
0 |
1 |
|
11 |
90 |
1 |
1 |
0 |
|
12 |
90 |
1 |
1 |
1 |
|
13 |
70 |
1 |
0 |
0 |
|
14 |
40 |
0 |
0 |
0 |
where the three flag bits V, R, and M stand for Valid, Referenced, and Modified, respectively.
(a) If a clock interrupt occurs at tick 100 (current virtual time), show the contents of the new table entries. Briefly explain any changes. (You can omit entries that are unchanged.)
(b) Suppose that instead of a clock interrupt, a page fault occurs at tick 100 due to a read request to page 14. Show the contents of the new table entries. Explain which page will be evicted, giving the changes made to that page in the table, and explain the changes made to page 14. (You can omit entries that are unchanged.)
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