SE3910 Week 8, Class 2 Week 4 Lab: Please return your graded Lab 4 to me so I can enter it in my gradebook Week 7, Class 2 (Wednesday) Half-Exam 2 Done.

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Presentation transcript:

SE3910 Week 8, Class 2 Week 4 Lab: Please return your graded Lab 4 to me so I can enter it in my gradebook Week 7, Class 2 (Wednesday) Half-Exam 2 Done grading – returned this class Week 8 Lab: First deliverables for Final Project due – See webpage & Week 8 Checklist Today RTOS – Real-time Operating Systems Scheduling SE-2811 Slide design: Dr. Mark L. Hornick Content: Dr. Hornick Errors: Dr. Yoder 1

Real-Time Operating Systems What is a hard real-time system? What is a real-time operating system? SE-2811 Dr.Yoder 2

Lab 3 Spring 2016 response times button-press to LED SE-2811 Dr.Yoder 3

Exercise Name two non-essential OS components and describe why each is non-essential. SE Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 4

Levels of Operating Systems SE-2811 Dr.Yoder 5

Scheduling Theory What is a schedule? SE-2811 Dr.Yoder 6

Round-Robin Scheduling SE Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 7

Round-Robin Scheduling with pre-emption SE Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 8

Cyclic Code Scheduling Scheduling decisions are made periodically rather than arbitrarily Major cycle (hyperperiod) The minimum time required to execute tasks allocated to the CPU Equal to the least common multiple of the task periods Frames The locations where scheduling decisions are made No premption within frames SE Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 9

Optimal Cyclic Code Scheduling – Rate Monotonic Scheduling SE Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 10