FCFS Full Form

By BYJU'S Exam Prep

Updated on: September 25th, 2023

The FCFS full form is First Come First Serve. FCFS scheduling is one of the CPU scheduling algorithms used by the mid-term scheduler. First Come First Serve (FCFS full form) is the simplest and one of the easiest scheduling algorithms. It uses a FIFO queue (FIFO Full Form: First In First Out) to execute processes.

In this article, we will learn about the FCFS full form, various scheduling algorithms available along with the full form, the characteristics of FCFS scheduling, benefits and limitations of FCFS in comparison to other available algorithms. To know more information about FCFS scheduling, let us check the FCFS full form given below.

Download Complete Computer Network Formula Notes PDF

What is FCFS Full Form?

The FCFS full form is First Come First Serve. The first scheduling algorithm one learns in the operating system is FCFS Scheduling. Among the different scheduling algorithms, FCFC scheduling full form is the simplest and easiest to implement. Let us see the characteristics of FCFS scheduling.

  • It executes all the processes on a first-come, first-serve basis.
  • Not complicated to implement.
  • It takes arrival time as the criteria to select processes.
  • It follows a non-preemptive approach.
  • Feasible to use.

CPU Scheduling Algorithm

It is defined as a process of selecting and assigning processes to the CPU for execution. Whenever the CPU is idle, the scheduler selects a process from the ready queue and assigns it to the CPU for execution. A mid-term scheduler does the scheduling of the process.

A mid-term scheduler selects one of the processes from the ready queue and assigns it to the CPU. It uses various scheduling algorithms to select processes. These scheduling algorithms are further divided into two categories.

  • Preemptive: Preemptive algorithms are one in which the execution can be preempted forcefully or due to the lack of resources. There are various preemptive scheduling algorithms, such as preemptive priority scheduling, SRTF, LRTF, etc.
  • Non-preemptive: In non-preemptive algorithms, the process terminates only after the complete execution. It will not be interrupted or preempted for any reason. Non-preemptive algorithms are FCFC, HRRN, SJF, and LJF.

FCFS Full Form: Benefits

The FCFS full form is First Come First Serve. Having discussed the implementation process and the characteristics of FCFS, we will now learn about the benefits of this particular scheduling algorithm. The benefits are as follows:

  • There is no starvation in the case of FCFS.
  • It is a fair algorithm as no priority of the processes is involved.
  • Easy and simple implementation.
  • It follows the FIFO queue to assign processes.

FCFS Full Form: Limitations

The FCFS scheduling full form is simple and easy to implement, which makes it hassle-free for the scheduler to select any process from the ready queue. However, there are some setbacks to using the FCFS scheduling algorithm, which are as follows.

  • It leads to a convoy effect, which is undesirable.
  • It does not lead to increased throughput.
  • It is not compatible with the time-sharing systems.

Important GATE Topics

Determinate And Indeterminate Structures Astable Multivibrators
Bistable Multivibrator Truss And Frame
Network Layer Statically Determinate
Anomalies In Dbms Eulers Equation Of Motion
Dalembert’s Principle Statically Indeterminate
Our Apps Playstore
SSC and Bank
Other Exams
GradeStack Learning Pvt. Ltd.Windsor IT Park, Tower - A, 2nd Floor, Sector 125, Noida, Uttar Pradesh 201303
Home Practice Test Series Premium