1. Dionicio D. Gante, Genevev G. Reyes & Vanylive T. Galima DDistributed Operating Systems

2. What is Distributed Systems?

3. Consists of several computers that do not share a memory or a clock; The computers communicate with each other by exchanging messages over a communication network; and Each computer has its own memory and runs its own operating system. Distributed System is used to describe a system with the following characteristics:

4. Architecture of Distributed OS

5. What is Distributed Operating Systems?

6. Definition of Distributed OS It extends the concepts of resource management and user friendly interface for shared memory computers a step further, encompassing a distributed computing system consisting of several autonomous computers connected by a communicating network.

7. Issues in Distributed OS Global Knowledge Naming Scalability Compatibility Process Synchronization Resource Management Security Structuring

8. What are the Advantages of Distributed Systems Over Traditional Time-Sharing Systems?

9. The Main Advantage of Distributed Systems is: They have a decisive price/ performance advantage over more traditional time- sharing systems

10. Other Significant Advantages: Resource Sharing Enhanced Performance Improved Reliability and availability Modular expandability

11. What are the three categories of a distributed systems?

12. Tanenbaum and Renesse classified distributed systems into three broad categories, namely: the minicomputer model, the workstation model and the processor pool model.

13. Minicomputer Model Workstation Model Processor Pool Model Categories of Distributed Systems

14. What is mutual exclusion?

15. Mutual exclusion is a collection of techniques for sharing resources so that different uses do not conflict and cause unwanted interactions.

16. What are the differences between mutual exclusion in a single computer systems from distributed systems?

17. What is the primary objective of mutual exclusion?

18. To maintain mutual exclusion; that is, to guarantee that only one request accesses the critical section at a time.

19. What are the characteristics important in mutual exclusion?

20. Characteristics are considered important in a mutual exclusion algorithm: Freedom from Deadlocks Freedom from Starvation Fairness Fault Tolerance

21. How to measure the performance The number of messages necessary per CS invocation. The synchronization delay The response time

22. Thank you for listening and for not asking questions!