Computer Science - Operating Systems Concepts - Discussion


The memory allocation scheme subject to "external" fragmentation is

[A]. segmentation
[B]. swapping
[C]. pure demand paging
[D]. multiple contiguous fixed partitions
[E]. None of the above

Answer: Option A


No answer description available for this question.

Batman said: (Oct 12, 2011)  
But "paging avoids external fragmentation and the need of compaction" ----- SilberSchatz book.

Amal Chakravarty said: (Nov 5, 2011)  
Segmentation suffers from external fragmentation and paging suffres from internal fragmentation.

Swapnil said: (Jan 23, 2013)  
External fragmentation memory is separated into small blocks and we also called segmentation.

Uzair said: (Jun 6, 2014)  
Paging and Segmentation avoids fragmentation. So why answer is A?

Rajesh said: (May 8, 2015)  
Yes, Paging and Segmentation are used to avoid fragmentation.

Then how come the answer is A. Can anyone explain it?

Janu Vunnam said: (Aug 28, 2015)  
What is External Fragmentation & Internal fragmentation?

Surbhi Jha said: (Feb 5, 2016)  
A partition of main memory is wasted within a partition is said to be INTERNAL FRAGMENTATION.

And the wastage of an entire partition is said to be EXTERNAL FRAGMENTATION.

Dnyaneshwar said: (Apr 1, 2016)  
External fragmentation means: suppose you have memory block available of 100mb and you have 3 tasks of say 1st 5mb, 2nd 4mb and 3rd 10mb. But remember although you have 100mb but you can give that memory block to any one of them.

So simple you have to broke that memory block means to make a segment of say 20mb segment size.

So remember now you have 5 segments of 20mb n you can store 5 different data of size up to 20 MB.

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