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Which Dining Philosophers solution would you choose to minimize latency while avoiding deadlock and starvation, and why?

hard🌍 Real-world Scenario Q9 of Q15
Operating Systems - Dining Philosophers - Problem, Deadlock & Solution
You are designing a multi-threaded system with shared resources similar to forks. Which Dining Philosophers solution would you choose to minimize latency while avoiding deadlock and starvation, and why?
AGlobal waiter with fair queue to prevent deadlock and starvation but with higher latency
BResource hierarchy ordering to avoid deadlock with minimal overhead
CRandom fork acquisition with timeout to balance fairness and simplicity
DNo synchronization, relying on hardware atomicity for safety
Step-by-Step Solution
Solution:

  1. Step 1: Identify design goals

    Minimize latency, avoid deadlock and starvation.

  2. Step 2: Evaluate resource hierarchy

    Prevents deadlock but can cause starvation and unfairness.

  3. Step 3: Evaluate global waiter

    Prevents deadlock and starvation via fair queueing, but adds latency due to centralized control.

  4. Step 4: Evaluate other options

    Random acquisition with timeout is unpredictable; no synchronization risks race conditions.

  5. Final Answer:

    Option A -> Option A

  6. Quick Check:

    Fair queueing trades latency for deadlock and starvation freedom [OK]
Quick Trick: Fair queueing trades latency for starvation freedom [OK]
Common Mistakes:
MISTAKES
  • Choosing resource hierarchy ignoring starvation
  • Picking random acquisition for fairness
  • Ignoring synchronization risks
Trap Explanation:
PITFALL
  • Candidates often prioritize latency over starvation freedom, missing trade-offs in real systems.
Interviewer Note:
CONTEXT
  • Evaluates candidate's ability to balance trade-offs in system design.
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