Understanding the Difference Between Turn Around Time and Waiting Time in CPU Scheduling

In the world of CPU scheduling, understanding the concepts of Waiting Time (WT) and Turn Around Time (TAT) is crucial. These timescales are critical in determining the efficiency of a process's execution, and are calculated using Completion, Arrival, and Burst Time. This article will delve into the differences between TAT and WT in the context of CPU Scheduling.

Defining Turn Around Time (TAT)

• TAT is the total time from when a process is submitted to when it is completed.
• TAT of a process is calculated as the difference between its completion time and arrival time.

Completion Time (CT) – This is the precise moment when a process finishes its execution.

Arrival Time (AT) – This is when a process arrives in its ready state, before it begins execution.

Therefore, CT – AT = TAT

Defining Waiting Time (WT)

• WT is the total time a process spends waiting in the ready queue before it is processed by the CPU.
• The waiting time of a process is the difference between its turn around time and burst time.

Burst Time (BT) – This is the total time a process needs for its execution.

Therefore, TAT – BT = WT

We can also calculate the Turn Around Time using the Burst Time and the Waiting Time.

So, BT + WT = TAT

Contrasting Turn Around Time (TAT) and Waiting Time (WT) in CPU Scheduling

Let's examine the key differences between Turn Around Time (TAT) and Waiting Time (WT) in CPU Scheduling.

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