Operating System | FCFS CPU Scheduling | UGC NET Computer Science by Aditi Mam | Bits & Bytes

Operating System | FCFS CPU Scheduling | UGC NET Computer Science by Aditi Mam | Bits & Bytes

Welcome to another important lecture from the Bits & Bytes Series by Aditi Mam 🚀 In this video, Aditi Mam covers one of the most fundamental topics of Operating Systems — FCFS CPU Scheduling (First Come First Serve Scheduling).

FCFS is one of the simplest and most important CPU scheduling algorithms frequently asked in UGC NET Computer Science, GATE, university exams, and technical interviews. This lecture is designed in a simple and exam-oriented way to help students understand concepts clearly and solve scheduling numericals easily.

📚 Topics Covered in This Video:
✔ Introduction to CPU Scheduling
✔ What is FCFS Scheduling?
✔ Working of FCFS Algorithm
✔ FIFO Concept
✔ Non-Preemptive Scheduling
✔ Gantt Chart Explanation
✔ Turnaround Time Calculation
✔ Waiting Time Calculation
✔ Response Time Concepts
✔ Advantages & Disadvantages of FCFS
✔ Convoy Effect
✔ Important MCQs & PYQs

💻 What is FCFS Scheduling?
FCFS (First Come First Serve) is a CPU scheduling algorithm in which the process that arrives first gets executed first. It follows the FIFO (First In First Out) principle.

This algorithm is simple to implement and helps students understand the basics of process scheduling in Operating Systems.

📌 Important Concepts Explained:

Arrival Time (AT)
Burst Time (BT)
Completion Time (CT)
Turnaround Time (TAT)
Waiting Time (WT)
Response Time (RT)

📌 Important Formulas:

✔ Turnaround Time = Completion Time – Arrival Time

✔ Waiting Time = Turnaround Time – Burst Time

These formulas are highly important for solving numerical questions in UGC NET and GATE exams.

✅ Advantages of FCFS Scheduling:

Simple and easy to understand
Easy implementation using queue
Fair execution based on arrival order
No starvation problem

⚠️ Disadvantages of FCFS Scheduling:

High waiting time for short processes
Convoy effect problem
Poor performance in time-sharing systems

🎯 Why This Topic is Important for UGC NET?
CPU Scheduling is one of the most important topics in Operating Systems. Questions based on scheduling algorithms and numericals are frequently asked in competitive exams.

This video helps students:
✔ Build strong OS fundamentals
✔ Improve numerical solving skills
✔ Understand process scheduling concepts
✔ Prepare effectively for exams

👨‍🎓 Who Should Watch This Video?

UGC NET Computer Science Aspirants
GATE CS Students
B.Tech / MCA / BCA Students
Beginners learning Operating Systems
Students preparing for technical interviews

📌 Preparation Tips:
✔ Practice Gantt chart numericals regularly
✔ Revise formulas daily
✔ Solve PYQs for better understanding
✔ Focus on concepts before calculations

🚀 Stay consistent, practice smartly, and strengthen your concepts to achieve your goal of UGC NET JRF & Assistant Professor.

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