Lec19-Scheduling II

Lec19-Scheduling II - Operating System Operating System...

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Unformatted text preview: Operating System Operating System Spring 09 Spring 09 National University National University of Computer & Emerging Sciences of Computer & Emerging Sciences Lec19-Scheduling II Lec19-Scheduling II Prepared by Prepared by Uzma Maroof Uzma Maroof uzma.maroof@nu.edu.pk uzma.maroof@nu.edu.pk 2 Reference Material Reference Material Chapter 6 CPU Scheduling Operating system concepts Sixth edition Silberschatz 3 Priority scheduling Priority scheduling Not all jobs equal So: rank them. Each process has a priority Run highest priority ready job in system Priorities can be static or dynamic or both Among the Processes of equal priority Round robin FCFS 4 Priority scheduling Priority scheduling Priority scheduling can be Preemptive or Non- Preemptive When a process arrives and enters the Ready Queue Its priority is compared with the currently Running Process If Higher Preemptive Scheduling Run the New Thread Non-Preemptive Scheduling Continue running the Current Thread 5...
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Lec19-Scheduling II - Operating System Operating System...

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