Which memory management approach aligns most closely with the working set model to reduce thrashing?

easy🔍 Pattern Recognition Q2 of Q15

Operating Systems - Thrashing - Working Set Model & Prevention

AAllocating pages based on the total number of processes without considering individual needs.

BUsing a fixed time window to track pages actively used by each process and allocating frames accordingly.

CEmploying a first-in-first-out (FIFO) page replacement without locality consideration.

DAllowing processes to request pages on demand without any frame allocation limits.

Step-by-Step Solution

Solution:

Step 1: Recall working set model mechanism
The working set model uses a fixed time window to identify pages actively used by each process, guiding frame allocation.
Step 2: Evaluate options
A: Uses a fixed time window to track active pages per process, matching the working set model.
B: Allocating based on total processes ignores individual locality, risking thrashing.
C: FIFO ignores locality, increasing thrashing risk.
D: No frame limits can cause thrashing due to uncontrolled page faults.
Final Answer:
Option B -> Option B
Quick Check:
Fixed time window tracking active pages matches working set [OK]

Quick Trick: Working set tracks active pages in a fixed recent time window [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Candidates often overlook the importance of the fixed time window to identify the working set, confusing it with static or demand-based approaches.

Interviewer Note:

CONTEXT

Checks understanding of working set time window concept and its role in frame allocation.

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