
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:6. Next-fit is an allocation algorithm that starts by using the first-fit algorithm,
but it keeps track of the partition that was last allocated, so that it can start
its next search from that exact spot instead of restarting the search with Block
1. In other words, it starts searching from the most recently allocated block
when the next job arrives. Using the following configuration with jobs arriving
in order (Job A, B, C, and D) and with blocks shown in order from low-order
memory to high-order memory:
Job List:
Job Number
Job A
Job B
Job C
Job D
Memory Requested
625K
44K
900K
220K
Memory Block List:
Memory Block
Block 1
Block 2
Block 3
Block 4
Block 5
Memory Block Size
250K
900K
280K
200K
50K
a. Indicate which memory blocks are allocated to each of the arriving jobs.
b. Explain in your own words what advantages the next-fit algorithm could
offer.
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