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Lecture Operating system concepts (Fifth edition): Module 5 - Avi Silberschatz, Peter Galvin

Module 5 - CPU scheduling. CPU scheduling is the basis of multiprogrammed operating systems. By switching the CPU among processes, the operating system can make the computer more productive. In this chapter, we introduce the basic scheduling concepts and discuss in great length CPU scheduling. FCFS, SJF, Round-Robin, Priority, and the other scheduling algorithms should be familiar to the students. Module 5: CPU Scheduling • Basic Concepts • Scheduling Criteria • Scheduling Algorithms • Multiple-

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Module 5: CPU Scheduling • Basic Concepts • Scheduling Criteria • Scheduling Algorithms • Multiple-Processor Scheduling • Real-Time Scheduling • Algorithm Evaluation Operating System 5.1 Silberschatz and Galvin 1999 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 Operating System 5.2 Silberschatz and Galvin 1999 Alternating Sequence of CPU And I/O Bursts Operating System 5.3 Silberschatz and Galvin 1999 Histogram of CPU-burst Times Operating System 5.4 Silberschatz and Galvin 1999 CPU Scheduler • 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. Operating System 5.5 Silberschatz and Galvin 1999 ... - tailieumienphi.vn
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