Question

Q4. Compare the memory organization schemes of contiguous memory allocation, pure paging and pure segmentation with respect to the following issues: a. External fragmentation b. Internal fragmentation c. Ability/ease of sharing code across processes.

Answer 1

Pure paging uses fixed size blocks to store files, which leads to internal fragmentation , when file size is small and fixed block size is large.

Pure segmentation and contiguous memory allocation schemes, memory is partitioned into variable size blocks, which may lead to external fragmentation due to available smaller blocks after removing smaller files.

Ease of code sharing access process is difficult in contiguous memory allocation, because each process has its space.

But in paging and segmentation ,the virtual address space can be mapped to physical space, so it's easy to share code across process.