GATE CS 2017 Set 2 — Question 51
Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.NAT+2 / -0MediumPriority SchedulingProcess SchedulingOperating SystemScheduling Numericals
Operating System → Process Scheduling → Priority Scheduling
Last updated
Question
Consider the set of processes with arrival time (in milliseconds), CPU burst time (in milliseconds), and priority (0 is the highest priority) shown below. None of the processes have I/O burst time.
The average waiting time (in milliseconds) of all the processes using preemptive priority scheduling algorithm is ___________.
| Process | Arrival Time | Burst Time | Priority |
|---|---|---|---|
| 0 | 11 | 2 | |
| 5 | 28 | 0 | |
| 12 | 2 | 3 | |
| 2 | 10 | 1 | |
| 9 | 16 | 4 |
Correct answer
29 to 29
Solution
Preemptive Priority Scheduling (Lower number = Higher priority):Gantt Chart:
- : runs (Priority 2). At , (Priority 1) arrives and preempts . ( remaining: 9)
- : runs. At , (Priority 0) arrives and preempts . ( remaining: 7)
- : runs to completion as it has the highest priority. ()
- : resumes and finishes. ()
- : resumes and finishes. ()
- : (Priority 3) runs and finishes. ()
- : (Priority 4) runs and finishes. ()
- :
- :
- :
- :
- :
Continue learning with Success Tracker
A step still unclear? Work through it with support
Use Success Tracker to ask about the reasoning, then try another GATE CS question to check your understanding.
AI-powered practice· Unlimited practice on eligible plans
- PYQs with solutions
- Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
- Practice that adapts
- Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
- AI doubt support
- Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.
Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.
This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.
More questions on Process Scheduling
2026 Set 2 Q23Which one of the following CPU scheduling algorithms cannot be preemptive?2026 Set 1 Q29With respect to deadlocks in an operating system, which of the following statements is/are FALSE?2026 Set 1 Q31In the context of relational database normalization, which of the following statements is/are true?2026 Set 1 Q35Consider a system consisting of instances of a resource , being shared by 5 processes.…2026 Set 2 Q51Consider three processes P1, P2, and P3 running identical code, as shown in the pseudocode below. A…