Scheduling Algorithms - Scheduling Disciplines - Fixed Priority Pre-emptive Scheduling

Fixed Priority Pre-emptive Scheduling

The OS assigns a fixed priority rank to every process, and the scheduler arranges the processes in the ready queue in order of their priority. Lower priority processes get interrupted by incoming higher priority processes.

  • Overhead is not minimal, nor is it significant.
  • FPPS has no particular advantage in terms of throughput over FIFO scheduling.
  • Waiting time and response time depend on the priority of the process. Higher priority processes have smaller waiting and response times.
  • Deadlines can be met by giving processes with deadlines a higher priority.
  • Starvation of lower priority processes is possible with large amounts of high priority processes queuing for CPU time.

Read more about this topic:  Scheduling Algorithms, Scheduling Disciplines

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