Question discussion

A process spends 80% of its time waiting for I/O. If four such independent processes are kept in memory, what is the CPU utilisation accord…

2378Medium DSSSB TGT Computer Science 0 replies

A process spends 80% of its time waiting for I/O. If four such independent processes are kept in memory, what is the CPU utilisation according to the probabilistic model 1 − pⁿ?

A80%
B41%
C59%
D96%

Correct answer: C

Explanation

All four processes wait simultaneously with probability 0.8⁴ ≈ 0.41, so the CPU is busy for 1 − 0.41 ≈ 0.59, i.e. about 59% of the time.

Join the discussion Report an error

Discussion 0

Nobody has replied yet. Start the discussion!