In Solaris, if an interactive thread with priority 25 is waiting for I/O, what is its priority recalculated to when it is eligible to run again?
A) 15
B) 120
C) 52
D) It remains at 25

Question

Quizplus · Accepted Answer

When an interactive thread with priority 25 is waiting for I/O, its priority is adjusted using a formula that takes into account the amount of time it has been waiting. The new priority can be calculated as:

new priority = base priority + (time waiting / scale factor)

For interactive threads, the base priority is 60 and the scale factor is 2. Therefore, when the thread becomes eligible to run again, its new priority would be:

60 + (time waiting / 2) = 60 + (0.5 * 25) = 72.5

However, priorities are integers, so the actual priority is truncated to 52 (the next lowest integer).

In Solaris, If an Interactive Thread with Priority 25 Is