FIRST COME FIRST SERVE SCHEDULING ALGORITHM OS
First Come First Serve (FCFS) is a scheduling algorithm used by operating systems to determine the order in which processes are executed on a CPU. As the name suggests, this algorithm schedules processes based on their arrival time, with the first process that arrives being the first to be served.
In the FCFS scheduling algorithm, the CPU executes processes in the order they are received. When a process is created, it is added to the end of the queue. The operating system then selects the first process in the queue to be executed and assigns it to the CPU. The process runs until it is either blocked, completes its execution, or is preempted by the operating system.
One of the advantages of the FCFS scheduling algorithm is its simplicity. The algorithm is easy to understand and implement, which makes it a popular choice for many operating systems. However, one of its major disadvantages is its poor performance in terms of average waiting time. Because the algorithm gives preference to the first process that arrives, it can result in longer waiting times for later processes. This problem is known as the convoy effect.
Despite its limitations, the FCFS scheduling algorithm continues to be used in many operating systems, particularly in systems with low process arrival rates or short execution times. It is also often used as a basis for more complex scheduling algorithms that take into account factors such as process priority, preemption, and time-sharing
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