Multi-programming, Time-sharing & Real-time systems - IIHE

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Interactive systems • Task directives given interactively by the user • Each user has its own access units (terminal : keyboard + screen) • The user units do not need to be driven by a symbiont • Commands generate interrupts and tasks state transition Average response time = n . t n : number of users; t : average execution time of a command • In general system in waiting state • Each user get the impression to have his own computer First Year University Studies in Science. ULB . Computer Principles. Chapter 12 D. Bertrand 14
Real time systems Time-sharing systems with strict timing constraints Systems requiring minimum response time : • Process control in industry • Probe control in space • Electronic assistance systems in cars • Flying systems in planes • Data acquisition systems (physics, chemistry, …) Systems requiring fast but not critical response time : • Reservation systems (plane, trains, …) • Automatic banking systems, … First Year University Studies in Science. ULB . Computer Principles. Chapter 12 D. Bertrand 15
Page 1 and 2: Multi-programming, Time-sharing & R
Page 3 and 4: Implementation Registers : • Gene
Page 5 and 6: Processes states • Concurrent pro
Page 7 and 8: Job classes and priorities Two main
Page 9 and 10: Input device Input queue Input symb
Page 11 and 12: 1 st case : Task A Task B ready 0 1
Page 13: Multi-programmation Time-sharing Co

Multi-programming, Time-sharing & Real-time systems - IIHE

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