CPU scheduling algorithms are used by operating systems to allocate CPU time to different processes. These algorithms are designed to ensure that processes are executed in a fair and efficient manner, while also optimizing the use of system resources. There are several Criteria that can be used to evaluate the effectiveness of CPU scheduling algorithms, and these criteria are important for determining which algorithm is best suited for a particular system.

CPU Utilization: This is a measure of how much time the CPU is being used to execute processes. A good scheduling algorithm should ensure that the CPU is utilized as much as possible, while also avoiding situations where the CPU is idle.

Throughput: This is a measure of how many processes can be executed in a given period of time. A good scheduling algorithm should maximize throughput by ensuring that as many processes as possible are executed during a given period of time.

Turnaround Time: This is a measure of the time it takes for a process to complete, from the time it is submitted to the time it is finished. A good scheduling algorithm should minimize turnaround time by ensuring that processes are executed in a timely and efficient manner.

Waiting Time: This is a measure of the time that a process spends waiting in the ready queue before it can be executed. A good scheduling algorithm should minimize waiting time by ensuring that processes are executed as soon as possible.

Response Time: This is a measure of the time it takes for a process to respond to a user request. A good scheduling algorithm should minimize response time by ensuring that processes are executed quickly and efficiently.

Its Need

We need CPU scheduling algorithms because they play a critical role in ensuring that operating systems can efficiently manage multiple processes and applications. Without these algorithms, it would be difficult to ensure that processes are executed in a fair and efficient manner, which could lead to poor system performance and reduced productivity. By using effective CPU scheduling algorithms, operating systems can ensure that resources are utilized in the most optimal way possible, resulting in better system performance and improved user experience.