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Compaction often gives solutions to the issues regarding external fragmentation.

One technique for overcoming external fragmentation in dynamic partitioning is

Compaction.

The reason why this technique of overcoming external fragmentation may be inefficient is because:

  • External fragmentation may need a lot of compaction and it is an expensive operation.

  • The use of contiguous allocation is often hard to fit processes into memory and also it is so difficult to grow or shrink the amount of memory allocated to a process.

  • Compaction only takes place when relocation is dynamic, and this also is expensive.

Compaction often shuffle memory notes or contents and then put or pile them up all in free memory and in one large block.

External fragmentation takes place when free memory is removed into small blocks.

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