Operating System - Distributed Operating Systems - Lecture Slides, Slides of Computer Science

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Case Study: The E1 Distributed

Operating System

What is the E1 Operating System?

• A distributed operating system with a single- system image
• A transparent user experience based on distributed object abstraction
• Efficient and reliable due to object replication

Goals of E

• Provide a convenient interface for users and software developers
• Maximize efficiency by minimizing the influence of remote communication bottlenecks
• Ensure reliability by providing redundant storage and execution, as well as fault recovery.

Features of E

• Transparent Access, based on distributed object abstraction

Implements Single System Image paradigm

• Distributed system looks like a centralized one
• Allows developers to ignore the physical layout of resources and focus on functionality Based on Distributed Object concept

Features of E

• Component Model Support Prefabricated, reusable components make software deployment easier The component model specifies the environment in which components operate, including: - Method invocation mechanism - Naming service - Garbage collection Extending the component model across the network provides a convenient environment for distributed application development

Structure of E1: Microkernel

Architecture

• Microkernel architecture moves vital system- wide processes to a user level

Microkernel operates in a single node (user's machine, etc) Handles operations such as Address Spaces, Threads, Interrupt Dispatching Prevents one massive kernel from handling all system processes over the network

Structure of E

• System consists of interacting modules located in different network nodes

Replication objects store synchronized state data in one or more nodes on the network Replicating data over the network provides error- handling and recovery Semantics object implements the functionality of the replicated object, so that it can run independent from the object communicating with the network

Structure of E1: Distributed

Objects and Replication

No

How to Use E

• E1 exists as a prototype but no applications are available yet
• Distributed objects (programs) can be written in C++ as long as they conform to the documented component model
• Interface Definition Language and Replication Strategies Compiler exist for integrating programs into the operating system

Applications of E

• Robust distributed system for developing distributed applications
• Safe and efficient due to object replication for multiple user use
• Convenient object-oriented development environment