As computer systems became more complex, the need for better ways to manage CPU resources also increased. CPU scheduling algorithms have been developed to manage the allocation of the CPU among the various processes that need to run on the system. There are many different criteria that can be used to evaluate the effectiveness of a CPU scheduling algorithm. we will discuss these criteria in simple language.
Introduction
CPU scheduling algorithms are an important part of any operating system. These algorithms are responsible for managing the allocation of CPU resources among the various processes running on a system. Without an effective CPU scheduling algorithm, the system would be unable to operate efficiently, leading to slow performance and reduced productivity.
Importance of CPU Scheduling Algorithm
CPU scheduling algorithms are essential for efficient utilization of system resources. These algorithms help to ensure that the CPU is used effectively, and that all processes receive their fair share of CPU time. Without a good CPU scheduling algorithm, the system would be unable to multitask effectively, leading to poor performance and reduced productivity.
Criteria for Evaluating CPU Scheduling Algorithm
There are several criteria that can be used to evaluate the effectiveness of a CPU scheduling algorithm. The most common criteria are:
Turnaround Time
Turnaround time is the amount of time it takes for a process to complete from the moment it is submitted to the system until the moment it finishes executing. The goal of a good CPU scheduling algorithm is to minimize the turnaround time for all processes.
Waiting Time
Waiting time is the amount of time a process spends in the ready queue waiting for the CPU. A good CPU scheduling algorithm should minimize the waiting time for all processes.
Response Time
Response time is the amount of time it takes for a process to start responding after it has been submitted to the system. A good CPU scheduling algorithm should minimize the response time for all processes.
Throughput
Throughput is the number of processes that can be completed in a given amount of time. A good CPU scheduling algorithm should maximize the throughput of the system.
Fairness
Fairness refers to the extent to which all processes are given a fair share of CPU time. A good CPU scheduling algorithm should ensure that all processes receive a fair share of CPU time, regardless of their priority or other characteristics.
Why do you need it ?
- Efficient utilization of CPU resources: A CPU scheduling algorithm helps to efficiently allocate CPU resources among the various processes running on a system, ensuring that the CPU is used effectively.
- Multitasking: With a good CPU scheduling algorithm, a system can perform multiple tasks simultaneously, improving productivity and efficiency.
- Fairness: A CPU scheduling algorithm ensures that all processes receive a fair share of CPU time, regardless of their priority or other characteristics.
- Improved system performance: An effective CPU scheduling algorithm can improve system performance, reducing response times and waiting times for processes.
- Better resource management: By managing system resources more effectively, a CPU scheduling algorithm can reduce the risk of system crashes and other performance issues.
- Prioritization: A CPU scheduling algorithm can prioritize critical processes, ensuring that they receive sufficient CPU time to complete their tasks.
- Resource sharing: A CPU scheduling algorithm allows different processes to share system resources, such as memory and I/O devices, while still maintaining optimal performance.
- Load balancing: A CPU scheduling algorithm can balance the workload across different CPUs, improving system performance and reducing the risk of overloading individual CPUs.
- Optimization: A good CPU scheduling algorithm can optimize system performance by dynamically adjusting CPU time allocation based on changing system conditions.
- Necessary for modern computing: With the increasing complexity of computer systems and the growing demand for multitasking and efficient resource utilization, a CPU scheduling algorithm is a necessary component of modern computing.