CPU scheduling algorithm

• CPU schedule CPU resouces to each threads with following algorithm from Ready Queue
• non-preemptive : doesn’t stop Job
  • FCFS : execute First in
  • SJF : execute shortest running time job
• preemptive : does stop Job when assigned time is running out
  • Round Robin : when time(you can set) exceed, insert job to queue again in the back
  • SRF : when shortest job insert in Ready Queue, stop current job and run it

To summarize

OS’s has 4 jobs

• CPU scheduling and process management
• Memory management
• Disk file management
• I/O device management