Practice Explanation Of Optimal Algorithm (20.2.1) - Belady's Anomaly - Computer Organisation and Architecture - Vol 3

Practice: Explanation of Optimal Algorithm

Lesson 20.2.1Belady's Anomaly

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6 sample questions

Question 1.
What is Belady's Anomaly?
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Think about how page frames relate to page faults.
Question 2.
Define the Optimal Algorithm.
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What does it predict about future usage?
3Question 3.
What does Belady’s anomaly demonstrate?
- A situation where increasing frames always reduces faults
- A situation where increasing frames can sometimes increase faults
- A situation unrelated to memory management
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Recall how page relationships affect fault occurrences.
4Question 4.
Is the Optimal Algorithm effective in preventing Belady's anomaly?
- True
- False
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Focus on the definition of the Optimal Algorithm.
Question 5.
Given a sequence of page references (7, 0, 1, 2, 0, 3, 0, 4) and three memory frames, how many page faults occur under the Optimal Algorithm?
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Consider how you choose which pages to evict.
Question 6.
If a system uses LRU with the following reference string and memory frames (1, 2, 3, 1, 4, 1, 2, 5), calculate the number of page faults.
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Track the pages that remain in memory based on their usage.

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