Dionicio D. Gante, Genevev G. Reyes & Vanylive T. Galima DDistributed Operating Systems
What is Distributed Systems?
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:
Architecture of Distributed OS
What is Distributed Operating Systems?
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.
Issues in Distributed OS Global Knowledge Naming Scalability Compatibility Process Synchronization Resource Management Security Structuring
What are the Advantages of Distributed Systems Over Traditional Time-Sharing Systems?
The Main Advantage of Distributed Systems is: They have a decisive price/ performance advantage over more traditional time- sharing systems
Other Significant Advantages: Resource Sharing Enhanced Performance Improved Reliability and availability Modular expandability
What are the three categories of a distributed systems?
Tanenbaum and Renesse classified distributed systems into three broad categories, namely: the minicomputer model, the workstation model and the processor pool model.
Minicomputer Model Workstation Model Processor Pool Model Categories of Distributed Systems
What is mutual exclusion?
Mutual exclusion is a collection of techniques for sharing resources so that different uses do not conflict and cause unwanted interactions.
What are the differences between mutual exclusion in a single computer systems from distributed systems?
What is the primary objective of mutual exclusion?
To maintain mutual exclusion; that is, to guarantee that only one request accesses the critical section at a time.
What are the characteristics important in mutual exclusion?
Characteristics are considered important in a mutual exclusion algorithm: Freedom from Deadlocks Freedom from Starvation Fairness Fault Tolerance
How to measure the performance The number of messages necessary per CS invocation. The synchronization delay The response time
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