GATE - 2004 | OS | Consider an operating system capable of loading and executing a

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.

Thank You

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