FCFS (First Come First Served) is the modest scheduling algorithm, FIFO queues processes in the order that they reach in the ready queue. Since context switches only occur upon process termination and no reorganization of the process queue requires, scheduling overhead is minimal.
Here we are going to focus on FCFS scheduling. FCFS Scheduling helps in to organize the processes in an efficient way for the processor.
The planning algorithms are responsible for ensuring that a process does not monopolize the processor. A process is a program that is running. This process can be in 3 different states “Ready” “Blocked” and “Running”. The processes are stored in a list along with the information that indicates the state of the process, the time the CPU has used, etc.
The acronym [FCFS] means First to arrive, First to be Served, within the CPU Planning algorithms, this is the easiest.
The workload processes in order of arrival. And also by not taking into account the state of the system or the resource needs of the individual processes, First Come First Served planning can lead to poor returns.
This algorithm has a high response time of the CPU because the process does not leave the CPU until it finishes because it is an algorithm Without Eviction (Not Appropriate). First Come First Served planning eliminates the notion of process priorities.
To choose the process to which the CPU will be assigned, the one that takes the most time ready (first in the queue) is preferred.
The execution of the process only yields the CPU for two reasons:
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It is easy to understand and easy to program. It is also fair. Track of all ready processes keeps a single linked list. Picking a process to run requires removing one from the front of the queue. Adding a new job or unblocked process requires attaching it to the end of the line.
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