Assume thatthe main memory has the following 5 fixed partitions with the following sizes: 100KB, 500KB, 200KB, 300KB and 600KB (in order) Explain the following allocation algorithms: First-fit, Best-fit and Worst-fit. How would each of the First-fit, Best-fit and Worst-fit algorithms place processes of 212KB, 417KB, 112KB and 426KB (in order)?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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  1. Assume thatthe main memory has the following 5 fixed partitions with the following sizes: 100KB, 500KB, 200KB, 300KB and 600KB (in order)
  2. Explain the following allocation algorithms: First-fit, Best-fit and Worst-fit.
  3. How would each of the First-fit, Best-fit and Worst-fit algorithms place processes of 212KB, 417KB, 112KB and 426KB (in order)?
  • Compute the total memory size that is not used for each algorithm.
  1. Which algorithm makes the efficient use of the memory?
  2. Consider the following Page tables and show the process allocation in main memory having 19 frame

Process 0 

 

Process 1

 

process 2

 

process 3

page #

Frame

 

Page #

Frame

 

Page #

Frame

 

Page #

Frame

0

3

 

0

0

 

0

1

 

0

2

1

4

 

1

5

 

1

6

 

1

11

2

7

 

2

8

 

2

13

 

2

12

3

9

 

 

 

 

3

15

 

3

14

4

10

 

 

 

 

4

16

 

 

 

 

 

 

 

 

 

5

17

 

 

 

 

 

 

 

 

 

6

18

 

 

 
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