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OS HRNN Example

OS HRNN Example with Definition and functions, OS Tutorial, Types of OS, Process Management Introduction, Attributes of a Process, Process Schedulers, CPU Scheduling, SJF Scheduling, FCFS with overhead, FCFS Scheduling etc.

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HRNN Example

In the following example, there are 5 processes given. Their arrival time and Burst Time are given in the table.

Process ID Arrival Time Burst Time
0 0 3
1 2 5
2 4 4
3 6 1
4 8 2

At time 0, The Process P0 arrives with the CPU burst time of 3 units. Since it is the only process arrived till now hence this will get scheduled immediately.

os hrrn scheduling

P0 is executed for 3 units, meanwhile, only one process P1 arrives at time 3. This will get scheduled immediately since the OS doesn't have a choice.

os hrrn scheduling 1

P1 is executed for 5 units. Meanwhile, all the processes get available. We have to calculate the Response Ratio for all the remaining jobs.

RR (P2) = ((8-4) +4)/4 = 2
RR (P3) = (2+1)/1 = 3
RR (P4) = (0+2)/2 = 1

Since, the Response ratio of P3 is higher hence P3 will be scheduled first.

os hrrn scheduling 2

P3 is scheduled for 1 unit. The next available processes are P2 and P4. Let's calculate their Response ratio.

RR ( P2) = (5+4)/4 = 2.25
RR (P4) = (1+2)/2 = 1.5

The response ratio of P2 is higher hence P2 will be scheduled.

os hrrn scheduling 3

Now, the only available process is P4 with the burst time of 2 units, since there is no other process available hence this will be scheduled.

os hrrn scheduling 4
Process ID Arrival Time Burst Time Completion Time Turn Around Time Waiting Time
0 0 3 3 3 0
1 2 5 8 6 1
2 4 4 13 9 5
3 6 1 9 3 2
4 8 2 15 7 5

                     Average Waiting Time = 13/5


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