Operating Systems - Thrashing - Working Set Model & Prevention
Under severe memory pressure, a system using the working set model still experiences thrashing. Which advanced technique is most appropriate to further reduce thrashing?
Under severe memory pressure, a system using the working set model still experiences thrashing. Which advanced technique is most appropriate to further reduce thrashing?
hard🔁 Follow Up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Recognize limitations of static working set model
Under extreme pressure, static working set allocations may be insufficient.Step 2: Identify advanced techniques
Page fault frequency (PFF) dynamically adjusts frames based on fault rates, adapting to changing demands.Step 3: Evaluate options
Increasing fixed frames blindly or disabling working set model worsens thrashing.
Reducing processes without adjusting allocation may not address thrashing effectively.Final Answer:
Option B -> Option BQuick Check:
Dynamic PFF adapts allocation to reduce thrashing [OK]
Quick Trick: Dynamic PFF adjusts frames to reduce thrashing [OK]
Common Mistakes:
MISTAKES- Assuming fixed frame increase always helps
- Thinking disabling working set model reduces thrashing
- Believing process reduction alone solves thrashing
Trap Explanation:
PITFALL- Fixed allocation or disabling working set model ignores dynamic needs
Interviewer Note:
CONTEXT- Tests knowledge of advanced thrashing mitigation beyond basic working set
Master "Thrashing - Working Set Model & Prevention" in Operating Systems
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