GATE - 2004 | OS | Consider an operating system capable of loading and executing a
Posted on 21-02-2022
GATE - 2004 [Operating System]
Question
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 (FCFS). If FCFS is replaced by Shortest Seek Time First (SSTF), claimed by the vendor to give 50% better benchmark results, what is the expected improvement in the I/O performance of user programs?
|
A |
50% |
|
B |
40% |
|
C |
25% |
|
D |
0% |
Solution:
Option (D) is Correct.
There is no improvement in the I/O performance.
→ The better vendor benchmark results don't affect the I/O performance.
→ In FCFS (or) SSTF only one choice is to choose for IO from multiple IO's. There is always one I/O at a time.