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What are the advantages AND disadvantages of paging and segmentation?
Wiki User
∙ 13y ago
Paging
Paging works by dividing memory into small pieces of memory (frames) and then logically divides the program into same-size pieces (pages).
Paging Advantages
Easy to allocated from free list of frames
-Physical memory is allocated from free list of frames
-External Fragmentation is not a problem
Easy to "page out" chunks of programs
-All Chunks are the same size (page size)
-Use valid bit to detect references to "paged-out" pages
Paging Disadvantages
Can Still have internal fragmentation
-process may not use memory in exact multiples of pages
Memory reference overhead
-2 references per address lookup
Memory required to hold page tables can be large
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∙ 13y ago
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Can combination of paging and segmentation result in better performance?
* Combine Paging and Segmentation ** Structure *** Segments correspond to logical units: code, data, stack. Segments vary in size and are often large. *** Each segment contains one or more (fixed-size) pages. ** Two levels of mapping to make tables manageable (2 look-ups!) *** Page table for each segment. * Segments Pages Advantages ** Advantages of Segments *** Supports sparse address spaces. If segment is not used, no need for page table. Decreases memory required for page tables. ** Advantages of Paging*** Eliminate external fragmentation. ** Advantages of Both. Increases flexibility of sharing. Share at two levels: Page or segment (entire page table). * Segments + Pages Disadvantages ** Internal fragmentation increases. Last page of every segment in every process . ** Increases overhead of accessing memory *** 1 or 2 overhead references for every real reference. ** Large page tables *** Two potential solutions: Page the user page tables (multilevel page table), Inverted page table.
Why paging is faster than segmentation?
Paging is a technique with the help of which we can divide the memory into pages which help us to easly access the files and it also decreases the Execution time (Saves SYSTEM time). It also creates a mirage of Memory.
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Segments can be of different lengths, so it is harder to find a place for a segment in memory than a page. With segmented virtual memory, we get the benefits of virtual memory but we still have to do dynamic storage allocation of physical memory. In order to avoid this, it is possible to combine segmentation andpaging into a two-level virtual memory system. Each segment descriptor points to page table for that segment.This give some of the advantages of paging (easy placement) with some of the advantages of segments (logical division of the program). ok hope wil b helfill
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