GATE CS 2015 Set 2 — Question 41
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Operating System → Memory Management → Contiguous Allocation
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Question
Consider six memory partitions of sizes 200 KB, 400 KB, 600 KB, 500 KB, 300 KB and 250 KB, where KB refers to kilobyte. These partitions need to be allotted to four processes of sizes 357 KB, 210 KB, 468 KB and 491 KB in that order. If the best fit algorithm is used, which partitions are NOT allotted to any process?
Correct answer
(A) 200 KB and 300 KB
Solution
The Best Fit algorithm allocates the smallest free partition that is large enough to hold the process.Available Partitions: {200, 400, 600, 500, 300, 250}
1.Process 1 (357 KB):
- Needs . Candidates: {400, 600, 500}.
- Best fit: 400 KB.
- Remaining: {200, 600, 500, 300, 250}
- Needs . Candidates: {600, 500, 300, 250}.
- Best fit: 250 KB.
- Remaining: {200, 600, 500, 300}
- Needs . Candidates: {600, 500}.
- Best fit: 500 KB.
- Remaining: {200, 600, 300}
- Needs . Candidates: {600}.
- Best fit: 600 KB.
- Remaining: {200, 300}
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