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If the time slice is too small, then RR is just like process sharing i.e., a process will take much time to wait. If the time slice is too large, then RR is just like FCFS. The performance of RR scheduling depends on the size of the time slice. Now, Waiting time for process P2 = 4 + 8 = 12ms Waiting time for process P1 = 0 + 8 + 1 = 9ms The Gantt chart for the following process will be like this: After that P3 is executed for 4ms, then it is completed and releases the CPU without interruption. P2 is executed for 4ms then it is put into the tail of the ready queue. After that, an interrupt occurs and P1 is put into the tail of the ready queue. Let the size of the time slice be 4ms, P1 takes CPU for the first 4ms. Java program for Round Robin Scheduling.With the help of the context switch, the CPU will then be allocated to the next process and this process will be moved to the tail of the queue Then the next process is executed. In the second case, an interrupt occurs at a single time slice.In the first case, the process CPU burst time is less than a single time slice, then the process will be completely executed and will release CPU and the next process is executed.After one time slice, the process either completes or moved to the end of the queue.The timer is set to interrupt after a one-time slice.The process is picked for execution from the front of the queue.A new process is added to the end of the queue.The procedure of RR Scheduling is as follows: Due to this fact, it is called time slice scheduling. Every time slice is between 10 to 100 ms.

Here, a ready queue is similar to a circular queue. Every process is allocated to CPU in the ready queue for a single time slice. The only difference between RR and FCFS scheduling is, RR is preemptive scheduling whereas FCFS is non-preemptive scheduling. The Round Robin scheduling is very much similar to FCFS.