Operating Systems - Page Replacement - FIFO, LRU, Optimal Algorithm
In which scenario is the Optimal page replacement algorithm most beneficial compared to FIFO and LRU?
In which scenario is the Optimal page replacement algorithm most beneficial compared to FIFO and LRU?
easy🔍 Pattern Recognition Q11 of Q15
Step-by-Step Solution
Step 1: Understand Optimal Algorithm's Principle
The Optimal algorithm evicts the page that will not be used for the longest time in the future, which requires knowledge of future requests.Step 2: Analyze Each Option
When the system can predict future page requests accurately is correct because Optimal needs future knowledge to be effective.
When the system has very limited memory and needs a simple algorithm is incorrect because Optimal is complex and not simple.
When the workload is highly random and unpredictable is incorrect because unpredictability makes future knowledge impossible.
When the system wants to minimize implementation complexity is incorrect because Optimal is the most complex to implement.Final Answer:
Option C -> Option CQuick Check:
Optimal is theoretical and best when future requests are known.
Quick Trick: Optimal needs future knowledge -> best with predictable workloads [OK]
Common Mistakes:
MISTAKES- Assuming Optimal is practical without future knowledge
- Confusing simplicity with effectiveness
- Believing Optimal works well with random workloads
Trap Explanation:
PITFALL- Options B, C, and D are tempting because they describe common system constraints, but Optimal's key requirement is future knowledge, which is rarely available.
Interviewer Note:
CONTEXT- Tests candidate's understanding of when Optimal algorithm is applicable versus practical constraints.
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