You are designing a virtual memory system for a real-time embedded device with strict latency requirements and limited CPU resources. Which page replacement algorithm would you choose and why?

hard🌍 Real-world Scenario Q9 of Q15

Operating Systems - Page Replacement - FIFO, LRU, Optimal Algorithm

AClock algorithm, because it approximates LRU with lower overhead

BLRU, because it balances fault rate and reasonable implementation overhead

COptimal, because it guarantees minimal page faults and latency

DFIFO, because it has minimal overhead and predictable behavior

Step-by-Step Solution

Solution:

Step 1: Consider real-time and resource constraints
Optimal is impractical due to future knowledge. LRU has overhead that may violate latency. Clock approximates LRU but still has overhead. FIFO is simplest with predictable timing, suitable for strict latency.
Final Answer:
Option D -> Option D
Quick Check:
FIFO suits real-time with minimal overhead [OK]

Quick Trick: FIFO's simplicity fits real-time constraints best [OK]

Common Mistakes:

MISTAKES

Choosing Optimal ignoring impracticality
Picking LRU despite overhead
Assuming Clock is always better than FIFO

Trap Explanation:

PITFALL

Candidates often overlook overhead impact on real-time systems, favoring theoretically better algorithms.

Interviewer Note:

CONTEXT

Evaluates practical trade-offs in system design under constraints.

Master "Page Replacement - FIFO, LRU, Optimal Algorithm" in Operating Systems

2 interactive learning modes - each teaches the same concept differently

Solution Trace

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More Operating Systems Quizzes

You are designing a virtual memory system for a real-time embedded device with strict latency requirements and limited CPU resources. Which page replacement algorithm would you choose and why?

Step 1: Consider real-time and resource constraints

Final Answer:

Quick Check:

Want More Practice?