Memory Management With OS

These flashcards cover paging, segmentation and virtual memory

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  • Created by: lordHan
  • Created on: 26-11-17 14:17
What is paging?
When RAM is split into fixed size chunks called pages, and each task/program is split over several pages.
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What is segmentation?
When RAM is split into chunks, of variable sizes, called segments, and each task/program is split over several segments.
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What kind of fragmentation happens with paging?
Internal - a program may not fit into a set amount of pages exactly, leaving part of a page unfilled.
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What kind of fragmentation happens with segmentation?
External - not all of the reserved areas of RAM may be used, as each will only store a certain type of data.
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What kind of sections are reserved with segmentation?
Often the RAM is split up so it has a code, a data and a stack section.
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What does non-contiguous mean?
It means that not all the parts of a program will be next to each other.
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Which out of paging and segmentation considers logical divisions?
Segmentation - this means it will often keep parts of a program such as functions together.
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What is virtual memory?
An area of the hard disk that acts as a holding area of pages from RAM.
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What is virtual memory used for?
It is used to store currently unused pages within RAM when the amount of memory space required exceeds the amount available.
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How does virtual memory work?
Pages are swapped between the RAM and the virtual memory as necessary e.g. a page will be swapped out of virtual memory when it is required.
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What is disk thrashing?
When continual swapping between the RAM and the virtual memory occurs, and slows down the computer.
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Other cards in this set

Card 2

Front

What is segmentation?

Back

When RAM is split into chunks, of variable sizes, called segments, and each task/program is split over several segments.

Card 3

Front

What kind of fragmentation happens with paging?

Back

Preview of the front of card 3

Card 4

Front

What kind of fragmentation happens with segmentation?

Back

Preview of the front of card 4

Card 5

Front

What kind of sections are reserved with segmentation?

Back

Preview of the front of card 5
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