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In which scenario is the buddy system memory allocation method most beneficial compared to simple fixed partitioning?

easy🔍 Pattern Recognition Q11 of Q15
Operating Systems - Internal vs External Fragmentation - Compaction & Buddy System
In which scenario is the buddy system memory allocation method most beneficial compared to simple fixed partitioning?
AWhen external fragmentation is not a concern and internal fragmentation is minimal
BWhen memory requests are highly variable and frequent, requiring efficient splitting and merging of blocks
CWhen all processes require fixed-size memory blocks with no variation
DWhen compaction is frequently used to reduce fragmentation
Step-by-Step Solution

  1. Step 1: Understand buddy system purpose

    The buddy system splits memory into power-of-two sized blocks and merges buddies to reduce fragmentation dynamically.

  2. Step 2: Analyze scenarios

    Fixed-size allocation (B) doesn't need buddy system; compaction (D) is a different technique; minimal fragmentation (A) reduces need for buddy system.

  3. Final Answer:

    Option B -> Option B

  4. Quick Check:

    Buddy system excels with variable-sized, frequent allocations [OK]
Quick Trick: Buddy system = dynamic splitting/merging for variable sizes [OK]
Common Mistakes:
MISTAKES
  • Confusing buddy system with fixed partitioning
  • Assuming compaction replaces buddy system
  • Thinking buddy system only helps when fragmentation is minimal
Trap Explanation:
PITFALL
  • Options B and C seem plausible because fixed partitions and minimal fragmentation reduce complexity, but buddy system shines with variable sizes. Option D confuses compaction with buddy system.
Interviewer Note:
CONTEXT
  • Tests candidate's ability to identify when buddy system is appropriate versus other memory management methods.
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