Question

Which of these scheduling criteria was the highest focus of a CPU in a Real-time OS? Explain

CPU Utilization

• Throughput
• Turnaround Time
• Waiting Time
• Response Time

Answer 1

The Highest focus of a CPU in a Real-Time OS is CPU Utilisation and Throughput . On a Real-Time OS CPU utilisation should range from 40% to 90% . Throughput i.e number of processes completed per unit time should be maximised by the operating system.

CPU Utilisation :

It refers to the amount of work handled by the CPU . The value of CPU Utilisation depends on the type of the computing task . Certain task might require more CPU time , while others require less. It can be used to calculate system performance.

It can be calculated by dividing requirements by capacity

Utilisation U = Requirements R / Capacity C

where Requirements R = Busy time

Capacity C = Busy time + Idle time

Ideally the CPU utilisation should be between 40% to 90%

40% - Light load on the CPU

90% - Heavy load on the CPU