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CPU SCHEDULING

CPU SCHEDULING. INTRODUCTION. CPU scheduling is the basis of multiprogrammed operating system. By switching the CPU among processes, the operating system can make the computer more productive. CPU – I/O Burst Cycle. CPU Scheduler. Preemptive / Nonpreemptive Scheduling. DISPATCHER.

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CPU SCHEDULING

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  1. CPU SCHEDULING

  2. INTRODUCTION CPU scheduling is the basis of multiprogrammed operating system. By switching the CPU among processes, the operating system can make the computer more productive

  3. CPU – I/O Burst Cycle CPU Scheduler Preemptive / Nonpreemptive Scheduling

  4. DISPATCHER • Switching context • Switching to user mode • Jumping to the proper location in the user program to restart that program

  5. Scheduling Criteria • CPU utilization • Throughput • Turnaround time • Waiting time • Response time

  6. SCHEDULING ALGORITHMS • First-Come , First-Served Scheduling Gantt chart: 24 27 30 0 Average waiting time: (0+24+27)/3 =17

  7. Shortest-Job-First Scheduling Gantt chart: 0 3 9 16 24 Average waiting time: (3+16+9+0) / 4 = 7

  8. Priority Scheduling Gantt chart: 0 1 6 16 18 19

  9. Waiting Time: P1 = 6 P2 = 0 P3 = 16 P4 = 18 P5 = 1 Average waiting time: 8.2 milliseconds

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