Question

The memory allocation scheme subject to external fragmentation is

• A. Segmentation
• B. Swapping
• C. Double buffering
• D. Pure demand paging

Hint:

Segmentation is subject to external fragmentation because segments are of variable sizes, and gaps may appear in memory.

Answer 1

The Correct Option is A

- Segmentation divides memory into segments, each of different sizes, and it can suffer from external fragmentation. This happens because the segments may not fit into the available free memory, leading to fragmented gaps between them.
- Swapping: This technique involves moving entire processes in and out of memory, and while it can introduce issues related to memory allocation, it does not directly deal with external fragmentation.
- Double buffering: This technique is used for managing I/O operations and is not related to memory fragmentation.
- Pure demand paging: Paging divides memory into fixed-size blocks (pages), which avoids external fragmentation since pages are of a fixed size.
Therefore, the correct answer is 1. Segmentation.