Topic: Operating Systems
In the context of Operating system process scheduling, if W represents Wait Time, R represents Run Time, T represents Turnaround time, S represents Response time, then which of the following is correct option with respect to given diagram?
Diagram showing timeline: Arrival -> Execution (Time1), Execution -> Finish (Time2), Arrival -> First Output (Time3), Arrival -> Finish (Time4).
- A. Time1:W, Time2:R, Time3:T, Time4:S
- B. Time1:S, Time2:W, Time3:R, Time4:T
- C. Time1:W, Time2:R, Time3:S, Time4:T
- D. Time1:R, Time2:S, Time3:W, Time4:T
Answer: C. Time1:W, Time2:R, Time3:S, Time4:T
Explanation: Based on standard OS scheduling metrics:
- Time from 'Arrival' to 'Execution' start is the time spent waiting in the ready queue, which is Wait Time (W) (in non-preemptive systems, this equals response time, but W is specifically the queue wait).
- Time from 'Execution' start to 'Finish' is the total Run Time (R).
- Time from 'Arrival' to 'First Output' represents Response Time (S).
- Time from 'Arrival' to 'Finish' is the Turnaround Time (T).