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7 distributed and real systems
- 1. Basics of Operating Systems : Distributed and Real systems • HOME PREVIOUS TOPIC NEXT • PREVIOUS QUESTION PAPERS FOR OS • CPP TUTORIALS 1
- 2. Basics of Operating Systems : Distributed and Real systems 2
- 3. Recap In the last class, you have learnt about • Multiprogramming • Time Sharing 3
- 4. Objectives On completion of this period, you would be able to know • Distributed Systems • Real Time Systems 4
- 5. Distributed Systems • Distributed systems are loosely coupled systems • A Distributed computer system is a collection of autonomous computer systems • Distributed systems communicate with one another through various communication lines like high speed buses or telephone lines • The processors in a distributed system may vary in size and function – Example: small microprocessors, workstations , minicomputer and large general purpose computers 5
- 7. Distributed System • Processors in distributed systems are referred by no. of different names like, sites, nodes, computers, etc. • Important reasons for building distributed systems are – Resource sharing – Computation speedup – Reliability – Communication • The key objective of a distributed operating system is transparency • Ideally, component and resource distribution should be hidden from users and applications programs unless they explicitly demand 7
- 8. Distributed System • A distributed operating system governs the operations of a distributed computer systems and provides a virtual machine abstraction to its users • Distributed operating system usually provides the means for system-wide sharing of resources, such as computational capacity, files and I/O devices • Distributed operating system facilitates access to remote resources, communication with remote process and distribution of computation 8
- 9. Real-Time System • Real-time systems has well defined, fixed time constraints • Processing must be done with in the defined constraints, or the system will fail • For example: • It would not do for a robot arm to be instructed to halt after it had smashed into the car it was building 9
- 10. Real-Time System
- 11. Real-Time System • Real-time system is used as a control device in a dedicated application • Sensors bring data to computers • Computer analyze data and adjust controls to modify the sensor inputs • Example: • Scientific experiments, medical imaging systems, industrial control systems etc.. • Real-time system functions correctly only if it returns the correct result within its time constraints 11
- 12. Real-Time System • A primary objective of real-time systems is to provide quick event - response times, thus meet the scheduling dead lines • User convenience and resource utilization are of secondary concern to real- time system designers • Real-time operating systems usually rely on some specific policies and techniques for doing their job 12
- 13. Real-Time System • Memory management in real-time systems is comparatively less demanding then in other types of multiprogramming systems • The primary reason for this is that many process permanently reside in memory in order to provide quick response time 13
- 14. Real-Time System • File management is usually found only in larger installation of real-time systems • In fact, some embedded real-time systems, such as an onboard automotive controller, may not even have any secondary storage • These include protection and access control 14
- 15. Summary • A primary objective of real-time systems is to provide quick event - response times, and thus meet the scheduling dead lines • User convenience and resource utilization are of secondary concern to real- time system designers • A distributed computer system is a collection of autonomous computer systems capable of communication and cooperation via their hardware and software interconnections 15
- 16. Frequently Asked Questions 1. Explain about Real Time Operating System 2. Explain about Distributed Operating System 16
- 17. Quiz 1. File management is usually found only in larger installation of real-time systems Yes No 17
- 18. Quiz 2. A distributed computer system is a collection of autonomous computer systems capable of communication and cooperation via their hardware and software interconnections Yes No 18
- 19. Other subject materials • Web designing • Micro processors • C++ tutorials • java home 19