Question

What are the advantages of Page Table over Segmentation. Solves external fragmentation. Easy process memory growth. Smaller page table size over segmentation table. Bigger virtual memory size

Answer 1

Answer:

Advantages of Segmented Paging

It reduces memory usage.

Page table size is limited by the segment size.

Segment table has only one entry corresponding to one actual segment.

External Fragmentation is not there.

It simplifies memory allocation.

Answer 2

Solves external fragmentation.

Explanation:

• Paging is a function of computer memory management which presents storage locations to the CPU of the computer as additional memory referred to virtual memory. Each piece of data requires a storage address.
• Segmentation is a virtual process which creates address spaces of variable sizes in computer storage for related data referred to as segments. This process speed up retrieval.
• As a memory management function, though segmentation is high-speed and highly efficient, external fragmentation is an insurmountable problem. External fragmentation occurs when unusable memory is located external to the allocated memory blocks.The dilemma is that the system might have adequate memory to satisfy the need for processing, but the memory is not in an contagious location. Over time, the cycle of segmentation deteriorates and speeds down considerably.
• Some modern computers use a function called segmented paging. The main memory is separated into segments of different size and then split into smaller pages that are of fixed-size on the disk. There is a table of pages in each segment, and multiple tables per process are present. Tables provide details on each segment page, and information on any segment is accessible in the segment table. Segment tables are converted into page tables and individual pages inside a segment are converted to page table. The advantages include less memory usage, simplified memory allocation,an additional level of data access security over paging, more flexibility on page sizes. The process does not cause external fragmentation.

To know more

Why are segmentation and paging sometimes combined into one ...

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