Consider an operating system capable of loading and executing a single…
2022
Consider an operating system capable of loading and executing a single sequential user process at a time. The disk head scheduling algorithm used is first come first served. If FCFS is replaced by shortest seek time first and the vendor claims 50% better benchmark results. What is the expected improvement in the I/O performance of user programs
- A.
50%
- B.
100%
- C.
25%
- D.
0%
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Correct answer: D
Since the system executes a single sequential process, there are no competing I/O requests. Disk scheduling algorithms like SSTF optimize seek times only when multiple requests exist concurrently. Therefore, switching from FCFS to SSTF yields no performance improvement for this specific workload.
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