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FCFS stands for First Come, First Served. An item is scheduled to be processed first if and when it becomes available. This differs from First In First Out (FIFO), where items are processed in order of arrival.
This kind of schedule has been around since the dawn of computing. It was used in mainframes and minicomputers before we had affordable personal computers, and it was used on servers and clusters long before that. These systems have evolved with us as technology has evolved, but they’ve always been a part of our world.
FCFS scheduling is one of the most common methods of scheduling in the world. It has been used for decades and is still widely used. The FCFS scheduling algorithm is a simple algorithm that has been around for almost as long as computers.
History of FCFS Scheduling
The idea behind FCFS scheduling is simple; allocate a fixed amount of processor time to each process. The history of FCFS scheduling is a long and complicated one. It involves many different people with different ideas and opinions.
This algorithm is also known as First Come, First Served, which means that each process gets an equal amount of CPU time. Wilkes’ algorithm has been around for over 50 years and has been used in many operating systems, such as Windows, Unix, and Linux. It’s still used today because it’s very efficient and works well with most applications. One of its projects involved developing a method for scheduling production jobs based on customer demand data rather than on previous orders from suppliers.
Characteristics of FCFS Scheduling
- First Come, First Served. Every item or service is scheduled on a first-come, first-served basis.
- Flexible resource consumption rules. The system does not require any particular order to consume its resources.
- This method works well for many types of systems because it allows all jobs to be completed without waiting for any other job to finish.
Advantages of FCFS
- The advantages are obvious; fewer people handle more tasks, resulting in greater efficiency.
- When fewer people work on a particular task, it’s easier to get their attention when needed.
- FCFS scheduling allows you to create multiple jobs by simply adding them together in one job queue.
- Allocating resources based on who uses them first, when they are available, and how much priority they have over those that use them later in the queue.
Disadvantages of FCFS
- The main disadvantage of FCFS scheduling is that it does not allow many different priorities to be given to the jobs.
- FCFS scheduling is that it does not allow for jobs that have different durations to be scheduled at different times.
- FCFS scheduling has the potential to tie up resources without knowing if there is a need for them.
- The lack of flexibility in FCFS scheduling can lead to problems meeting production deadlines.
This approach processes all jobs using the same priority within the same time slot. Jobs are assigned to their respective slots based on when the job was submitted to the queue and not by any other criteria such as its priority or importance. This type of scheduling results in an extremely predictable process that can be easily managed across multiple systems without requiring special facilities or software changes.
