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Comprehension

Consider the following set of processes with the arrival time and length of CPU burst time given in milli secends (ms)
Process Arrival Time Burst Time
P1 0 5
P2 2 3
P3 2 2
P4 5 3
P5 6 1

What is the average turnaround time for these Processes with First Come First Serve (FCFS) scheduling Algorithm?

  1. 5.3 ms
  2. 6.4 ms
  3. 7.0 ms
  4. 8.2 ms

Answer (Detailed Solution Below)

Option 3 : 7.0 ms

Detailed Solution

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The correct answer is : Option 3

key-point-imageKey Points

Scheduling Algorithm: First Come First Serve (FCFS)

Gantt chart:

P1

P2

P3

P4

P5

0 5 8 10 13 14

Process Table:

Process Arrival Time (AT) Burst Time (BT) Completion Time (CT) Turn Around Time (TAT)
P1 0 5 5 5
P2 2 3 8 6
P3 2 2 10 8
P4 5 3 13 8
P5 6 1 14 8

Average Turnaround Time: \({{5+6+8+8+8} \over 5} = 7.0\)

 Important Points:

TAT = CT - AT

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More Process Scheduling Questions

Q1.Which of the following is a benefit of scheduling emails?
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