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Real-Time Scheduling - Lecture Notes | CS 4414, Study notes of Operating Systems

University of Virginia (UVA)Operating Systems

Prof. Sang Son

Material Type: Notes; Professor: Son; Class: Operating Systems; Subject: Computer Science; University: University of Virginia; Term: Spring 2008;

Typology: Study notes

Pre 2010

Uploaded on 07/29/2009

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CS 414 : Operating Systems

UNIVERSITY OF VIRGINIA

Department of Computer Science

Spring 2008

Topic 8.1: Real-Time Scheduling

Real-time scheduling is priority-driven preemptive scheduling

All jobs are assumed to be periodic (not always the case)

Scheduling decisions are made

when any task arrives

when the processor becomes idle

At each decision, the process with the highest priority is executed

Processor is never left idle intentionally (greedy algorithms)

Types of scheduling: static or dynamic

Rate monotonic (RM)

Process with shorter period is assigned higher priority

Earliest deadline first (EDF)

process with the earliest deadline is assigned the highest priority

Example 1: A(2, 0.9), B(5,2.3)

Example 2: A(2,1), B(5,2.5)

Example 3: A(2,1), B(5,3)

Example 4: A(2,0.8), B(5,3.5)

— 8.1.1 —

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Department of Computer Science^ UNIVERSITY OF VIRGINIA CS 414 : Operating Systems

Spring 2008 Topic 8.1: Real-Time Scheduling

g g g Real-time scheduling is priority-driven preemptive schedulingAll jobs are assumed to be periodic (not always the case)Scheduling decisions are made

g At each decision, the process with the highest priority is executed^ g^ g^ when any task arriveswhen the processor becomes idle g g Processor is never left idle intentionally (greedy algorithms)Types of scheduling: static or dynamic g g Rate monotonic (RM)Earliest deadline first (EDF) g Process with shorter period is assigned higher priority

g Example 1: A(2, 0.9), B(5,2.3)^ g^ process with the earliest deadline is assigned the highest priority g g g Example 2: A(2,1), B(5,2.5)Example 3: A(2,1), B(5,3)Example 4: A(2,0.8), B(5,3.5)