Solution:
a) First-fit
The first-fit algorithm selects the first free partition that
is large enough to accommodate the request.
First-fit would allocate in the following manner:
|
b) Best-fit
The best-fit algorithm selects the partition whose size is
closest in size (and large enough) to the requested size.
Best-fit would allocate in the following manner:
|
c) Worst-fit
The worst-fit algorithm effectively selects the largest
partition for each request.
Worst-fit would allocate in the following manner:
|
(i) The best-fit algorithm performed the best of the three algorithms, as it was the only algorithm to meet all the memory requests.
(ii) Yes, internal and external fragmentation both are present in the above problem.
Internal fragmentation can be reduced effectively by dividing the memory into variable sized blocks and assigning the best-fit block to the process requesting for the memory. External fragmentation can be eliminated by compaction, paging, and segmentation so that memory can be allocated in a non-contiguous manner to a process.
In a nutshell, both internal and external fragmentation are natural process related to empty memory space or memory being wasted. However, the problem with both cases cannot be resolved entirely but can be mitigated to some extent with solutions given above.
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Given six memory partitions of 800 KB,500 KB,350KB,200KB,450KB and 100 KB (in order), how would the...
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