Round Robin Scheduler

Round Robin is a preemptive CPU scheduling algorithm. Processes wait in a FIFO ready queue and each process receives at most one time quantum. If a process does not finish during its turn, it returns to the rear of the ready queue and waits for another turn.

Scheduling structureFIFO queue
PreemptionAfter each quantum
FairnessEvery ready process gets CPU time
Queue operationsO(1)

Scheduler controls

700 ms

Ready Queue

FRONT — next process REAR — unfinished processes return here

Current Process

Add a process or load the example workload.

Elapsed time0
Ready processes0
Completed0
Context switches0

Process metrics

ProcessBurstRemainingCompletionTurnaround

Execution log

    Round Robin concepts

    Ready queue

    The process at the front runs next. An unfinished process is enqueued again at the rear after its quantum expires.

    Time quantum

    A smaller quantum improves responsiveness but increases context switches; a larger quantum behaves more like FCFS.

    Fairness

    No ready process can permanently monopolize the CPU because execution rotates through the queue.

    Queue connection

    Round Robin is a direct application of FIFO queue operations: dequeue from the front, execute, then optionally enqueue at the rear.