Operating Systems - Page Replacement - FIFO, LRU, Optimal Algorithm
Identify the misconception in the following statement: "FIFO page replacement always causes more page faults than LRU because it does not consider page usage frequency."
Identify the misconception in the following statement: "FIFO page replacement always causes more page faults than LRU because it does not consider page usage frequency."
medium🐞 Bug Identification Q7 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze FIFO vs LRU behavior
FIFO evicts oldest page, ignoring usage frequency. LRU evicts least recently used. However, depending on reference patterns, FIFO can cause fewer faults than LRU.Final Answer:
Option C -> Option CQuick Check:
FIFO can outperform LRU in some cases [OK]
Quick Trick: FIFO can outperform LRU depending on reference pattern [OK]
Common Mistakes:
MISTAKES- Believing FIFO always worse than LRU
- Thinking FIFO tracks usage frequency
- Assuming LRU ignores usage frequency
Trap Explanation:
PITFALL- Candidates overgeneralize FIFO's inferiority and misunderstand LRU's behavior.
Interviewer Note:
CONTEXT- Reveals nuanced understanding of algorithm trade-offs and misconceptions.
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