What is the difference between demand paging and demand segmentation

Save Article. Improve Article. Like Article. Next Paging in Operating System. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? Paging does not facilitate any sharing of procedures. Segmentation allows for the sharing of procedures. Paging fails to distinguish and secure procedures and data separately. Segmentation can be able to separate secure procedures and data.

Paging address space is one dimensional In segmentation, there is the availability of many independent address spaces In paging, the user just provides a single integer as the address, that is divided by the hardware into a page number and offset. In the segmentation method, the user specifies the address in two quantities 1 segment number 2 offset. The absence of internal fragmentation as external fragmentation has to be done.

The segment table is of lesser size compared with the page table in paging. The average size of the segment is larger to the actual size of the page Offer protection within the segment Not offers internal fragmentation Segment tables use lesser memory than paging As it offers the small segment table, memory reference is simple, which lends itself to sharing data among processes.

Longer memory lookup times compared to segmentation It may cause internal fragmentation Page tables consume additional memory. Multi-level paging may lead to memory reference overhead. Porting Linux to different architectures is difficult to process because it offers very limited support for segmentation. It demands programmer intervention. It is hard to allocate contagious memory to partition as it is of its variable size. This is costly memory management algorithm.

Report a Bug. Previous Prev. Save Article. Improve Article. Like Article. Demand Paging : Demand paging is identical to the paging system with swapping. In demand paging, a page is delivered into the memory on demand i. Demand paging combines the feature of simple paging and implement virtual memory as it has a large virtual memory. Lazy swapper concept is implemented in demand paging in which a page is not swapped into the memory unless it is required.

Segmentation : Segmentation is the arrangement of memory management.