CPU Scheduling in Operating Systems

Scheduling is done to finish the work or process on time. There are certain time with respect to process.

1. Arrival Time: Time at which the process arrives in the ready queue.
2. Completion Time: Time at which process completes its execution.
3. Burst Time: Time required by a process for CPU execution.
4. Turn Around Time: Difference between completion time and arrival time.
5. Waiting Time: Difference between turn around time and burst time.

Why do OS need scheduling?

The time when the process is in I/O state thus utilizing that time starting a new process will make it faster.

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Major Objective is :

• Fair allocation of CPU.
• Min Waiting Time.
• Min response time.
• Max throughput.

There are certain types of Scheduling Algorithms like First Come First Serve and Shortest Job First.