[Solved] You are designing an operating system scheduler for a system with frequent I/O-bound processes that... Which process state management approach would you choose to optimize responsiveness and why? | Operating Systems

Operating Systems - Process State Machine - Five-State Model

You are designing an operating system scheduler for a system with frequent I/O-bound processes that often wait on multiple devices simultaneously. Which process state management approach would you choose to optimize responsiveness and why?

AUse multiple Waiting states per I/O device to allow partial readiness and faster scheduling.

BTerminate processes during I/O waits and recreate them after completion to reduce state overhead.

CKeep processes in Ready state during I/O waits to maximize CPU utilization.

DImplement a single Waiting state with event counters to track multiple I/O completions before moving to Ready.

Step-by-Step Solution

Solution:

Step 1: Consider responsiveness and correctness
Processes must wait for all I/O events to complete before running again.
Step 2: Single Waiting state with counters
This approach accurately tracks all pending events and avoids premature scheduling.
Step 3: Multiple Waiting states complicate management and may cause incorrect scheduling.
Step 4: Keeping processes Ready during I/O wastes CPU on non-runnable processes.
Step 5: Terminating and recreating processes is inefficient and breaks process continuity.
Final Answer:
Option D -> Option D
Quick Check:
Counter-based Waiting state balances correctness and responsiveness [OK]

Quick Trick: Track all I/O events before Ready for correctness and responsiveness [OK]

Common Mistakes:

MISTAKES

Allowing partial readiness with multiple Waiting states
Keeping processes Ready during I/O wait
Terminating processes unnecessarily

Trap Explanation:

PITFALL

Candidates may prioritize CPU utilization over correctness or vice versa incorrectly.

Interviewer Note:

CONTEXT

Tests design trade-offs in process state management for I/O-heavy workloads.

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Solution Trace

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Which process state management approach would you choose to optimize responsiveness and why?

Step 1: Consider responsiveness and correctness

Step 2: Single Waiting state with counters

Step 3: Multiple Waiting states complicate management and may cause incorrect scheduling.

Step 4: Keeping processes Ready during I/O wastes CPU on non-runnable processes.

Step 5: Terminating and recreating processes is inefficient and breaks process continuity.

Final Answer:

Quick Check:

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