Preemptive SJF

• When a new task arrives, the SJF is evaluated again and rescheduling can take place.
• aka Shortest-remaining-time-first (SRTF) scheduling

Example (SRTF)

Adding Priority (Priority Scheduling)

• Simplest form is to add priority to a process.
  • Select the highest priority job first
  • Apply SJF/SRTF/FIFO/… scheduling only within a group of processes with the same priority

Priority scheduling + SJF