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Advance Operating System (CS G623)

Advance Operating System (CS G623). Agenda. Course Overview Distributed System Basics Multiprocessor Systems (Basic Architecture) Motivation behind Distributed Systems Distributed System Architecture Types Distributed Operating System DOS Issues.

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Advance Operating System (CS G623)

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  1. Advance Operating System (CS G623)

  2. Agenda • Course Overview • Distributed System Basics • Multiprocessor Systems (Basic Architecture) • Motivation behind Distributed Systems • Distributed System Architecture Types • Distributed Operating System • DOS Issues

  3. “Advanced Concepts in Operating Systems: Distributed, Database and Multiprocessor Operating Systems”, Tata McGraw Hill, 2001. By M. Singhal & N. Shivaratri • Text Book

  4. Reference Books • R1: P. K. Sinha, “Distributed Operating Systems” Pearson Education, 1998. • R2: Andrew S Tanenbaum and Martin Steen, “Distributed Systems : Principles and Paradigms” ISBN: 978-81-203-3498-4 • R3: Distributed Systems-Concepts and Design by G. Coulouris, AW

  5. Plan of Study

  6. Plan of Study

  7. Distributed Systems “ A Distributed System is a collection of independent computers that appears to its users as a single coherent system ” [Tanenbaum] “ A Distributed System is • a system having several computers that do not share a memory or a clock • Communication is via message passing • Each computer has its own OS+Memory [Shivaratri & Singhal]

  8. Multiprocessor System Architecture Types • Tightly Coupled Systems • Loosely Coupled Systems

  9. Tightly Coupled Systems • Systems with a single system wide memory • Parallel Processing System , SMMP (shared • memory multiprocessor systems)

  10. Loosely Coupled System • Distributed Memory Systems (DMS) • Communication via Message Passing

  11. Motivation • Resource Sharing • Enhanced Performance • Improved Reliability & Availability • Modular expandability

  12. Distributed System Architecture Types • Minicomputer Model • Workstation Model • Workstation – Server Model • Processor Pool Model • Hybrid Model

  13. MINICOMPUTER MODEL

  14. WORKSTATION MODEL

  15. WORKSTATION SERVERMODEL

  16. Processor Pool Model

  17. Hybrid Model • Based upon workstation-server model but with additional pool of processors • Processors in the pool can be allocated dynamically • Gives guaranteed response time to interactive jobs • More expensive to build

  18. Distributed OS “A distributed OS is one that looks to its users like an centralized OS but runs on multiple, independent CPUs. The key concept is transparency. In other words, the use of multiple processors should be invisible to the user. “ [Tanenbaum & Van Renesse]

  19. Issues • Global knowledge • Naming • Scalability • Compatibility • Process Synchronization • Resource Management • Security • Structuring

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