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You are designing an OS scheduler for a server handling both CPU-bound and I/O-bound processes. To minimize context switch overhead while maintaining responsiveness, which approach should you choose?

hard🌍 Real-world Scenario Q9 of Q15

Operating Systems - Context Switch - Cost & Causes

You are designing an OS scheduler for a server handling both CPU-bound and I/O-bound processes. To minimize context switch overhead while maintaining responsiveness, which approach should you choose?

AUse a priority scheduler that always favors CPU-bound processes.

BUse a multi-level feedback queue that adapts time slices based on process behavior.

CUse a first-come, first-served scheduler to avoid context switches.

DUse a fixed time slice round-robin scheduler for all processes.

Step-by-Step Solution

Solution:

Step 1: Understand workload characteristics
CPU-bound processes benefit from longer time slices; I/O-bound need shorter slices for responsiveness.
Step 2: Analyze scheduler options
Multi-level feedback queue adapts time slices, balancing overhead and responsiveness. Fixed round-robin wastes time on CPU-bound. FCFS causes poor responsiveness. Priority favoring CPU-bound starves I/O-bound.
Final Answer:
Option B -> Option B
Quick Check:
Adaptive scheduling balances overhead and responsiveness [OK]

Quick Trick: Adaptive queues balance overhead and responsiveness [OK]

Common Mistakes:

MISTAKES

Using fixed time slices ignoring process type
Choosing FCFS ignoring responsiveness
Favoring CPU-bound starving I/O-bound

Trap Explanation:

PITFALL

Candidates often pick simple schedulers ignoring workload diversity and overhead trade-offs.

Interviewer Note:

CONTEXT

Assesses ability to design scheduler balancing overhead and responsiveness.

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