Operating System

What are the main criteria used for comparing the CPU scheduling algorithm ?

The main criteria used to compare CPU scheduling algorithms are:

  • CPU utilization
  • The total percentage of time the CPU is busy running a process. The more utilization, the better the performance of the algorithm.
  • A high CPU utilization indicates that the CPU is busy and working efficiently, processing as many tasks as 
  • possible. However, a too high CPU utilization can also result in a system slowdown due to excessive competition for resources.
  • Throughput
  • The number of processes that are completed per unit of time. Maximizing throughput reflects the efficiency of the system.
  • Some CPU scheduling algorithms that prioritize throughput include Round Robin, Shortest Job First (SJF), and Multilevel Queue (MLQ). These algorithms aim to prioritize short and simple tasks to increase the number of completed tasks within a specific period.
  • Response time
  • The amount of time it takes for the CPU to respond to a request from a process. This parameter helps determine how responsive the system is to user requests. 
  • Response time is a criterion used in CPU scheduling that measures the time it takes for the system to respond to a user’s request or input. It is important to minimize response time because it affects user satisfaction and the overall efficiency of the system. A short response time indicates that the system is processing tasks quickly and efficiently, leading to improved user satisfaction and productivity

Other criteria include:

  • Turnaround time: The amount of time it takes to execute a particular process.
  • Waiting time: The amount of time a process has been waiting in the ready queue.

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