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)?
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
Section: Chapter Questions
Problem 1PE
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Question
- 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)?
- Compute the total memory size that is not used for each
algorithm .
- Which algorithm makes the efficient use of the memory?
- Consider the following Page tables and show the process allocation in main memory having 19 frame
Process 0 |
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Process 1 |
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process 2 |
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process 3 |
||||
page # |
Frame |
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Page # |
Frame |
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Page # |
Frame |
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Page # |
Frame |
0 |
3 |
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0 |
0 |
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0 |
1 |
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0 |
2 |
1 |
4 |
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1 |
5 |
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1 |
6 |
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1 |
11 |
2 |
7 |
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2 |
8 |
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2 |
13 |
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2 |
12 |
3 |
9 |
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3 |
15 |
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3 |
14 |
4 |
10 |
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4 |
16 |
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5 |
17 |
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6 |
18 |
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