Author(s)

Pawan Singh^*, Amit Pandey, Andargachew Mekonnen

School of Informatics, IOT, Hawassa University, Awassa, Ethiopia.

In present era, one of the most important resources of computer machine is CPU. With the increasing number of application, there exist a large number of processes in the computer system at the same time. Many processes in system simultaneously raise a challenging circumstance of managing the CPU in such a manner that the CPU utilization and processes execution gets optimal performance. The world is still waiting for most efficient algorithm which remains a challenging issue. In this manuscript, we have proposed a new algorithm Progressively Varying Response Ratio Priority a preemptive CPU scheduling algorithm based on the Priority Algorithm and Shortest Remaining Time First. In this scheduling algorithm, the priority is been calculated and the processes with high priority get CPU first or next. For new process, the priority of it becomes equal to inverse of burst time and for the old processes the priority calculation takes place as a ratio of waiting time and remaining burst time. The objective is to get all the processes executed with minimum average waiting time and no starvation. Experiment and comparison show that the VRRP outperforms other CPU scheduling algorithms. It gives better evaluation results in the form of scheduling criteria. We have used the deterministic model to compare the different algorithms.

Operating System, CPU Scheduling, Priority Scheduling, Turnaround Time, Waiting Time, Response Time, Context Switching

Singh, P. , Pandey, A. and Mekonnen, A. (2015) Varying Response Ratio Priority: A Preemptive CPU Scheduling Algorithm (VRRP). Journal of Computer and Communications, 3, 40-51. doi: 10.4236/jcc.2015.34005.