[Solved] You are designing a batch processing system where jobs arrive unpredictably with... To minimize average waiting time and avoid convoy effect, which scheduling strategy would you choose and why? | Operating Systems

Operating Systems - FCFS Scheduling - Convoy Effect & Waiting Time

You are designing a batch processing system where jobs arrive unpredictably with mixed CPU bursts. To minimize average waiting time and avoid convoy effect, which scheduling strategy would you choose and why?

AFCFS, because it is simple and fair by processing jobs in arrival order.

BShortest Remaining Time First (SRTF), as it dynamically prioritizes shorter jobs to reduce waiting time.

CNon-preemptive Priority Scheduling, prioritizing long jobs to maximize throughput.

DRound Robin with large time quantum, approximating FCFS behavior.

Step-by-Step Solution

Solution:

Step 1: Identify goals
Minimize average waiting time and avoid convoy effect.
Step 2: Evaluate strategies
A: FCFS is simple but prone to convoy effect.
B: SRTF preempts long jobs, reducing waiting time and convoy effect.
C: Prioritizing long jobs increases waiting time.
D: Round Robin with large quantum behaves like FCFS, not mitigating convoy effect.
Final Answer:
Option B -> Option B
Quick Check:
SRTF dynamically reduces waiting time and convoy effect [OK]

Quick Trick: SRTF preempts long jobs, minimizing waiting time [OK]

Common Mistakes:

MISTAKES

Choosing FCFS for fairness despite convoy effect
Assuming priority scheduling favors short jobs
Thinking large quantum Round Robin avoids convoy effect

Trap Explanation:

PITFALL

Candidates often pick FCFS for simplicity, ignoring dynamic preemption benefits of SRTF.

Interviewer Note:

CONTEXT

Assesses candidate's ability to select scheduling algorithms based on real-world trade-offs.

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More Operating Systems Quizzes

To minimize average waiting time and avoid convoy effect, which scheduling strategy would you choose and why?

Step 1: Identify goals

Step 2: Evaluate strategies

Final Answer:

Quick Check:

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