c program for srtf cpu scheduling algorithm program

Maximize the CPU utilization, meaning that keep the CPU as busy as possible.

The objectives of a scheduling algorithm are as follows: The multiprogramming can be achieved by the use of process scheduling. In a multiprogramming system, there can be one process using CPU while another is waiting for I/O whereas, in a uni programming system, time spent waiting for I/O is completely wasted as CPU is idle at this time. Why Do We Need Scheduling?Ī process to complete its execution needs both CPU time and I/O time. Throughput: It is the number of processes that are completing their execution per unit time. Waiting Time = Turn Around Time – Burst Time. Waiting Time: This is the difference in time between turnaround time and burst time.

Turn Around Time = Completion Time – Arrival Time.

Turn-Around Time: This is the difference in time between completion time and arrival time. There are some important terminologies to know for understanding the scheduling algorithms:Īrrival Time: This is the time at which a process arrives in the ready queue.Ĭompletion Time: This is the time at which a process completes its execution.īurst Time: This is the time required by a process for CPU execution. Often, these are the types of algorithms that can be used because of the limitation of the hardware. That is, once a process is running in CPU, it will release it either by context switching or terminating. In these algorithms, we cannot preempt the process.

That is, it releases the CPU, and the high-priority process takes the CPU for its execution. Whenever a high-priority process comes in, the lower-priority process which has occupied the CPU is preempted. In these algorithms, processes are assigned with a priority. There are two types of scheduling algorithms: The main goal or objective of CPU scheduling algorithms is to make sure that the CPU is never in an idle state, meaning that the OS has at least one of the processes ready for execution among the available processes in the ready queue. What is a Scheduling Algorithm?Ī CPU scheduling algorithm is used to determine which process will use CPU for execution and which processes to hold or remove from execution. This article mainly focuses on the detailed explanation of the scheduling algorithms, and it'll not cover the implementation of these algorithms on the code level. In this article, we'll learn about the most popular scheduling algorithms like First Come First Serve (FCFS), Shortest Job First (SJF), Shortest Remaining Time First (SRTF), and Round Robin (RR) We'll talk about how these algorithms work along with their advantages and disadvantages. A process scheduler removes one process from the running state in the CPU and selects another process to run based on some scheduling algorithms. At any given time, there is only one process that is running in the CPU.

In the operating system, everything is carried out by processes.

C program for srtf cpu scheduling algorithm program