Which is the simplest algorithm for FCFS scheduling? In the FCFS scheduling algorithm, the job that arrived first in the ready queue is allocated to the CPU and then the job that came second and so on. What is the full form of FCFS?įCFS stands for First Come First Serve. A perfect real life example of FCFS scheduling is buying tickets at ticket counter.
It’s easy to understand and implement programmatically, using a Queue data structure, where a new process enters through the tail of the queue, and the scheduler selects process from the head of the queue. In Operating System, FCFS Scheduling is a CPU Scheduling Algorithm that assigns CPU to the process on First Come First Serve basis. Is FIFO and FCFS same?įCFS is also the jargon term for the FIFO operating system scheduling algorithm, which gives every process central processing unit (CPU) time in the order in which it is demanded. What FCFS means?įCFS is the simplest of CPU Scheduling Algorithm which executes the process that comes first. FCFS is a non-preemptive scheduling algorithm as a process holds the CPU until it either terminates or performs I/O. ProcessįCFS stands for First Come First Serve. Hence, P3 is kept in a queue….How FCFS Works? Calculating Average Waiting Time. Using the FCFS scheduling algorithm, these processes are handled as follows. What is FCFS algorithm explain with example? The lesser the arrival time of the job, the sooner will the job get the CPU.
The job which comes first in the ready queue will get the CPU first.
What is the criteria for FCFS scheduling?įirst come first serve (FCFS) scheduling algorithm simply schedules the jobs according to their arrival time. Here we are considering that arrival time for all processes is 0. FIFO simply queues processes in the order that they arrive in the ready queue.
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