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Operating System II Ch.5 cpu scheduling

Operating System II Ch.5 cpu scheduling. Lecturer Assistant Sadeer Dheyaa Abdulameer. Cihan University - Sulaimaniya. Computer science Department. Chapter 5: CPU Scheduling. Basic Concepts Scheduling Criteria Scheduling Algorithms Multiple-Processor Scheduling Real-Time Scheduling

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Operating System II Ch.5 cpu scheduling

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  1. Operating System IICh.5cpu scheduling Lecturer Assistant Sadeer Dheyaa Abdulameer Cihan University - Sulaimaniya Computer science Department

  2. Chapter 5: CPU Scheduling • Basic Concepts • Scheduling Criteria • Scheduling Algorithms • Multiple-Processor Scheduling • Real-Time Scheduling • Algorithm Evaluation

  3. Basic Concepts • Maximum CPU utilization obtained with multiprogramming. • CPU–I/O Burst Cycle – Process execution consists of a cycle of CPU execution and I/O wait. • CPU burst distribution.

  4. Alternating Sequence of CPU And I/O Bursts

  5. CPU SchedulerQ:what we mean cpu scheduler? When cpu take decisions • Selects from among the processes in memory that are ready to execute, and allocates the CPU to one of them. • CPU scheduling decisions may take place when a process: 1. Switches from running to waiting state. 2. Switches from running to ready state. 3. Switches from waiting to ready. 4. Terminates. • Scheduling under 1 and 4 is nonpreemptive. • All other scheduling is preemptive.

  6. Q:what we mean by dispatcher and dispatcher latency Dispatcher • Dispatcher module gives control of the CPU to the process selected by the short-term scheduler; this involves: • switching context • switching to user mode • jumping to the proper location in the user program to restart that program • Dispatch latency – time it takes for the dispatcher to stop one process and start another running.

  7. Q:What are the Scheduling Criteria Scheduling Criteria • CPU utilization – keep the CPU as busy as possible • Throughput – number of processes that complete their execution per time unit • Turnaround time – amount of time to execute a particular process • Waiting time – amount of time a process has been waiting in the ready queue • Response time – amount of time it takes from when a request was submitted until the first response is produced, not output (for time-sharing environment)

  8. Q: What are the Optimization Criteria Optimization Criteria • Max CPU utilization • Max throughput • Min turnaround time • Min waiting time • Min response time

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