Multiple choice

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 Fist (SSTF), claimed by the vendor to given 50% better benchmark results, what is the expected improvement in the I/O performance of user programs?

  1. 50%

  2. 40%

  3. 25%

  4. 0%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

I/O performance is not entirely dependent upon disk access, it has effect of various other devices, so using SSTF in place of FCFS may reduce disk access time but no improvement in the I/O is done.

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