Question

In: Computer Science

Consider the following page reference string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0,...

Consider the following page reference string:

0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

How many page faults would occur for the following replacement algorithms, assuming one, three, five, and seven frames? Remember that all frames are initially empty, so your first unique pages will cost one fault each.

  • Optimal replacement
  • LRU replacement
  • CLOCK replacement
  • FIFO replacement

Solutions

Expert Solution

One frame:

Optimal replacement:

string:

No of page faults = 20

LRU replacement :

string:

No of page faults = 20

CLOCK replacement

string:

No of page faults = 20

FIFO replacement

string:

No of page faults = 20

Three frames:

Optimal replacement:

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0         0    0    0   2   2   2   2 2

1         1    1    1   1   6   1   1   1

2         3    4    5   5   5   5   0   5

No of page faults =11

LRU replacement :

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0   3   3   4   4   4 0 0   6   6   1   1   1

1   1   1   1   5   5 5 2   2   2   2   2    2

2   2   0   0   0   1 1 1   1   5   5   0    5

No of page faults = 15

CLOCK replacement :

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0   3 3 4 4 4 0 0 6   6 6   1 1   1

1   1 1 1 5 5 5 2   2 5 5   5 0    5

2   2 0 0 0 1 1 1   1 1 2   2 2    2

No of page faults = 16

FIFO replacement

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0 3 3 3 5 5 5 2 2 2 1 1 1   5

1 1 0 0 0 1 1 1 6 6 6 0 0   0

2 2 2 4 4 4 0 0 0 5 5 5   2 2

No of page faults = 16

Five frames:

Optimal replacement:

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0 0 0

1 1 1

2 2 2

3 5 5

4 4 6

No of page faults = 7

LRU replacement :

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0 0 0 0

1 1 1 1

2 5 5 5

3 3 2 2

4 4 4 6

No of page faults = 8

CLOCK replacement :

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0 0 0 0

1 1 1 1

2 5 5 5

3 3 2 2

4 4 4 6

No of page faults = 8

FIFO replacement

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0 5 5 5 5 5

1 1 0 0 0 0

2 2 2 1 1 1

3 3 3 3 2 2

4 4 4 4 4 6

No of page faults = 10

Seven frames:

Optimal replacement:

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0

1

2

3

4

5

6

No of page faults = 7

LRU replacement :

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0

1

2

3

4

5

6

No of page faults = 7

CLOCK replacement :

string: 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0

1

2

3

4

5

6

No of page faults = 7

FIFO replacement

string : 0, 1, 2, 3, 1, 0, 4, 5, 1, 0, 1, 2, 6, 5, 2, 1, 0, 1, 2, 5

0

1

2

3

4

5

6

No of page faults = 7

venereology answered 2 months ago
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