ch5 - perating System Concepts with Java – 7 th Edition,...

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Unformatted text preview: perating System Concepts with Java – 7 th Edition, Nov 15, 2006 Silberschatz, Galvin and Gagne ©2007 Chapter 5: CPU Scheduling 5.2 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 Chapter 5: CPU Scheduling ¡ Basic Concepts ¡ Scheduling Criteria ¡ Scheduling Algorithms ¡ Multiple-Processor Scheduling ¡ Real-Time Scheduling ¡ Thread Scheduling ¡ Operating Systems Examples ¡ Java Thread Scheduling ¡ Algorithm Evaluation 5.3 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 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 5.4 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 Alternating Sequence of CPU And I/O Bursts 5.5 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 Histogram of CPU-burst Times 5.6 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 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 5.7 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 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 5.8 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 Scheduling Criteria ¡ CPU utilization – keep the CPU as busy as possible ¡ Throughput – # 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) 5.9 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 Optimization Criteria ¡ Max CPU utilization ¡ Max throughput ¡ Min turnaround time ¡ Min waiting time ¡ Min response time 5.10 Silberschatz, Galvin and Gagne ©2007 Operating System Concepts with Java – 7 th Edition, Nov 15, 2006 First-Come, First-Served (FCFS) Scheduling...
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This note was uploaded on 09/08/2010 for the course CS 149 at San Jose State.

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ch5 - perating System Concepts with Java – 7 th Edition,...

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