Round-Robin Scheduling is a popular scheduling algorithm used by most operating systems. It is based on a round-robin scheme where the processes will be assigned to run in a round-robin fashion. Here in this example, the processes P1, P2, P3 and P4 will be scheduled in a round-robin fashion to run on the processor.
Round-Robin scheduling is an ideal solution in case there are no waiting processes to run. It is the best solution for random or non-deterministic workloads. It is also preferred in situation where the workload can not be anticipated in advance or it is assumed that the workload will be balanced across the processes.
So, the scheduling algorithm yields the following order of execution:
P1 starts its execution at time = 0 and finishes by time = 8
P2 starts its execution at time = 8 and finishes by time = 16
P3 starts its execution at time = 16 and finishes by time = 20
P4 starts its execution at time = 16 and completes its execution by time = 20
P5 starts its execution at time = 16 and completes its execution by time = 20
In round robin scheduling, P1 will be executed first and it completes its execution at time = 8. Then P2 will be executed and finishes its execution at time = 16. After that, P3 will be executed and finishes its execution at time = 20. So, the total time for running of the process is 8 + 16 + 20 = 36.
The priority scheduling algorithm in Operating Systems is preemption. Two or more processes running at same priority is in Preemptive scheduling. The process that has higher priority is assigned to preempt the low priority process.
In our example where two processes were running at same priority and priority scheduling was not doing, whenever a low priority process finished, the running process at higher priority will take the CPU and process at lower priority will be put in the ready queue. But How exactly is it done?
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