Published by: Zaya
Published date: 22 Jun 2021
In Paging, a process address space is broken into fixed-sized blocks called pages. In Segmentation, a process address space is broken into varying-sized blocks called sections. Operating System divides the memory into pages. During segmentation, a logical address is divided into section number and section offset.
Paging divides the program into fixed-size pages. whereas, Segmentation divides the program into variable size segments. Paging is faster than segmentation.
| S.N. | Paging | Segmentation |
|---|---|---|
| 1 | Non-Contiguous memory allocation | Non-contiguous memory allocation |
| 2 | Paging divides the program into fixed-size pages. | Segmentation divides the program into variable size segments. |
| 3 | OS is responsible | The compiler is responsible. |
| 4 | Paging is faster than segmentation | Segmentation is slower than paging |
| 5 | Paging is closer to Operating System | Segmentation is closer to User |
| 6 | It suffers from internal fragmentation | It suffers from external fragmentation |
| 7 | There is no external fragmentation | There is no external fragmentation |
| 8 | The logical address is divided into a page number and page offset | The logical address is divided into segment number and segment offset |
| 9 | The page table is used to maintain the page information. | Segment Table maintains the segment information |
| 10 | Page table entry has the frame number and some flag bits to represent details about pages. | Segment table entry has the base address of the segment and some protection bits for the segments. |