I / O performance - Example - Operating System

Q.  We have an operating system, which is capable of loading and executing a single sequential user process at a time. If the disk head scheduling algorithm which is initially First Come First Served (FCFS) is replaced by Shortest Seek Time First (SSTF) claimed by the vendor to give 50% better benchmark results then what is the expected improvement in the I / O performance of the user programs?
- Published on 27 Aug 15

a. 0%
b. 25%
c. 50%
d. 75%

ANSWER: 0%

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    Discussion

  • Nirja Shah   -Posted on 18 Nov 15
    - An Operating System can execute a single sequential user process at a time and the disk is accessed in FCFS manner always.

    - A choice is never provided to the OS to select an IO from the multiple IOs as there can be only one IO at a time.

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