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Operating System Design Options

Operating System Design Options. Hierarchical Structure. Many OS are designed and implemented using a hierarchical structure. Functions at one level are allowed to refer only to functions provided by the same or lower levels; i.e., there should be no outward calls.

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Operating System Design Options

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  1. Operating SystemDesign Options

  2. Hierarchical Structure • Many OS are designed and implemented using a hierarchical structure. • Functions at one level are allowed to refer only to functions provided by the same or lower levels; i.e., there should be no outward calls. • Strict hierarchy vs. transparent hierarchy

  3. Virtual Machines • Hierarchical structure concepts can be extended to provide users, including OSs, the illusion of running on separate virtual machines. • OS1, OS2, OS3, and User5 deal with the VMM, instead of the real machine.

  4. Virtual Machines • VMM provides resources, services, and functions that are the same as those available on the underlying real machine. • VMM is actually a complete, but simple, OS for the real machine. • Pros: flexibility and convenience • Cons: simulation overhead

  5. Multiprocessor OSs • Types of multiprocessor architecture

  6. Multiprocessor OSs • Types of multiprocessor OSs:

  7. Network Operating Systems

  8. Distributed Operating Systems

  9. Object-Oriented Operating Systems • Most of the system is implemented as a collection of objects. • Each object encapsulates a data structure and defines a set of operations, called methods, on that data structure.

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