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1. F i r s t - C o m e , F i r s t - S e r v e d ( F C F S ) S c h e d u l i n g Algorithm This presentation explores the First-Come, First-Served (FCFS) scheduling algorithm, a fundamental concept in operating systems. by Ansari alkama Mohd rehan

2. What is the F C F S A lgorith m ? FCFS is a simple scheduling algorithm where processes are served in the order they arrive in the ready queue. The process that arrives first is executed first, regardless of its CPU burst time or priority. 1 FIFO FCFS is also known as First-In, First-Out (FIFO). 2 Non-Preemptive On c e a p r o c ess s t ar t s e x ecuting, it runs t o c ompl e tion without being in t erru p t ed.

3. Cantt Cha r t R ep r esen t ation of F C F S 1 P r ocess 1 Process 1 starts executing at time and completes at time 5. 2 P r ocess 2 Process 2 starts executing at time 5 and completes at time 10. 3 P r ocess 3 Process 3 starts executing at time 10 and completes at time 15.

4. E x ample of F C F S Scheduling Process Arri v al Time Bu r s t Time Compl e tion Time P1 5 5 P2 2 3 8 P3 4 2 10

5. A d v an t ages of F C F S Algorithm Simplicity F C F S is e asy t o under s t and and implement. Fairness P r o c esses ar e se r v ed in the o r der the y arri v e, ensuring fairness.

6. Disad v an t ages of F C F S A lgorithm Starvation A short p r o c ess arriving behind a long p r o c ess may ha v e t o w ait f or a long time. Inefficiency It may not be optimal for systems with processes having v a r ying CPU bu r s t times.

7. Comparison with Other Scheduling A lgorithms Algorithm Strengths Weaknesses FCFS Simple, F air Can l e ad t o starvation, Inefficient SJF O p timal in t erms o f a v e r a g e w aiting time R equi r es kn o wled g e o f bu r s t time, Can l e ad t o s t a r v a tion Priority Scheduling Prioriti z es impor t ant processes Can l e ad t o s t a r v a tion, May n o t be f air R ound R obin F ai r , P r e v en t s starvation May ha v e higher c on t e x t swi t ching overhead

8. Conclusion and K e y Takeaways F C F S IS a SImple and f aIr SchedulIng al g orIthm but c an be In effIcIent In certaIn SItuatIonS. It IS Important to underStand ItS advantageS and dISadvantageS when cho o SIng a SchedulIng al g orIthm f or a Sy S tem.