Explain the difference between preemptive and non-preemptive scheduling algorithms.

  • Preemptive scheduling allows a higher priority task to interrupt a lower priority task, while non-preemptive scheduling doesn't allow such interruptions.
  • Preemptive scheduling executes tasks based on their priority and can lead to better response times for critical tasks, whereas non-preemptive scheduling may lead to longer waiting times for higher priority tasks.
  • Preemptive scheduling improves system responsiveness by allowing higher priority tasks to execute immediately, whereas non-preemptive scheduling may result in longer average response times for critical tasks.
  • Preemptive scheduling prioritizes tasks based on their urgency and interrupts lower priority tasks, whereas non-preemptive scheduling executes tasks until completion before moving to the next one.
Preemptive scheduling algorithms, such as Priority Scheduling and Round Robin with Time Slice, are suitable for real-time systems where tasks have varying levels of urgency. Non-preemptive scheduling, like First-Come-First-Serve and Shortest Job Next, is simpler but may not be ideal for time-sensitive applications due to potential delays caused by lower priority tasks. Understanding these differences is crucial in designing efficient scheduling mechanisms for different system requirements.
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