Practice Description of the Anomaly - 19.7.1 | 19. Approximate LRU Implementation | Computer Organisation and Architecture - Vol 3
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19.7.1 - Description of the Anomaly

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is the purpose of the reference bit in the approximate LRU algorithm?

💡 Hint: Think about how the system remembers page usage.

Question 2

Easy

Can you explain Belady's anomaly in simple terms?

💡 Hint: Consider how FIFO might not always select the most appropriate page to replace.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does the reference bit signify in the approximate LRU?

  • To mark the least used page
  • To indicate a page was accessed recently
  • To store frequency of use

💡 Hint: Remember how the bit reflects recent activity.

Question 2

True or False: Belady's anomaly can occur in any page replacement algorithm.

  • True
  • False

💡 Hint: Consider which algorithms are impacted by memory management decisions.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Assume you have 4 page frames, and a reference string as follows: 1, 2, 3, 4, 1, 2, 5, 1, 2, 3, 4, 5. Calculate page faults for FIFO, LRU, and Optimal algorithms, discuss which is most efficient.

💡 Hint: Map page replacements based on algorithm characteristics.

Question 2

Develop a scenario in which Belady's anomaly appears with a page reference string of your choosing. Explain the phenomenon observed.

💡 Hint: Construct a sequence that forces earlier references to be replaced unnecessarily.

Challenge and get performance evaluation