CSCE 3612 ch6-3

CSCE 3612 ch6-3 - © 2008 Wayne Wolf Overheads for...

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Unformatted text preview: © 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Processes and operating systems ❚ Scheduling policies: ❙ RMS; ❙ EDF. ❚ Scheduling modeling assumptions. © 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Metrics ❚ How do we evaluate a scheduling policy: ❙ Ability to satisfy all deadlines. ❙ CPU utilization---percentage of time devoted to useful work. ❙ Scheduling overhead---time required to make scheduling decision. © 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Rate monotonic scheduling ❚ RMS (Liu and Layland): widely-used, analyzable scheduling policy. ❚ Analysis is known as Rate Monotonic Analysis ( RMA ). © 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. RMA model ❚ All process run on single CPU. ❚ Zero context switch time. ❚ No data dependencies between processes. ❚ Process execution time is constant. ❚ Deadline is at end of period. ❚ Highest-priority ready process runs. © 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Process parameters ❚ T i is computation time of process i; τ i is period of process i....
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This note was uploaded on 09/30/2008 for the course CSCE 3612 taught by Professor Goodrum during the Fall '08 term at North Texas.

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CSCE 3612 ch6-3 - © 2008 Wayne Wolf Overheads for...

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