NET 424: REAL-TIME SYSTEMS (Practical Part) Networks and Communication Department Tutorial 2 : Real-Time Questions

How a real time system is different from other computer based systems? a real time system is characterized by key features that make it different from traditional computing system: timing characteristic (the response should be delivered in a specific time, not before and not after that time), RTS are based on low level programming languages, RTS enable access to hardware components, RTS are designed for a specific hardware..... Networks and Communication Department

Rate-monotonic (RM) algorithm: What is the difference between static priority and dynamic priority algorithms? Give example for each. A fixed-priority algorithm assigns the same priority to all the jobs in each task. Example: Rate-monotonic (RM) algorithm: It assigns priorities to tasks based on their periods: the shorter the period, the higher the priority. Hence, the higher the rate, the higher the priority. Networks and Communication Department

(Cont.) A dynamic-priority algorithm assigns different priorities to the individual jobs in each task. Example: Earliest-Deadline-First (EDF) algorithm assigns priorities to jobs according to their deadlines. The earlier the deadline, the higher the priority. Networks and Communication Department

Give the applications of real time systems.  real-time application (RTA) is an application programs that functions within a time frame that the user senses as immediate or current. The latency must be less than a defined value, usually measured in seconds.  Examples of RTAs include: Videoconference applications VoIP (voice over Internet Protocol) Online gaming Some e-commerce transactions Chatting IM (instant messaging) Networks and Communication Department