cis620-12
... have been modified to perform in a multi-user environment. • Every object name created within a session is appended with a unique identifier number associated with the individual session that created it (SessionID). ...
... have been modified to perform in a multi-user environment. • Every object name created within a session is appended with a unique identifier number associated with the individual session that created it (SessionID). ...
Chorus and other Microkernels
... • Ports - Queues attached to actors by which threads of one actor send messages to threads of another. • Site - The basic unit of computing hardware, consisting of one or more processors, memory, and I/O devices. • Thread - The unit of execution in Chorus. It has the same meaning as it does in Windo ...
... • Ports - Queues attached to actors by which threads of one actor send messages to threads of another. • Site - The basic unit of computing hardware, consisting of one or more processors, memory, and I/O devices. • Thread - The unit of execution in Chorus. It has the same meaning as it does in Windo ...
chapter 1 Introduction
... An OS is the interface between the hardware and the software environment, equivalent to an extended or virtual machine An OS is a resource manager – provides “resource abstraction” ...
... An OS is the interface between the hardware and the software environment, equivalent to an extended or virtual machine An OS is a resource manager – provides “resource abstraction” ...
Designing Distributed Object Systems
... • Specifically looking at the problems of distributed systems, eg • architecture, components, technologies • testing and analysis • performance, scalability, reliability ...
... • Specifically looking at the problems of distributed systems, eg • architecture, components, technologies • testing and analysis • performance, scalability, reliability ...
process
... In this model the services of the OS are offered through specialized processes, which are able to handle only certain type of requests. Parts of the operating system are being implemented directly in user processes (client processes). The OS kernel should be more likely oriented through commun ...
... In this model the services of the OS are offered through specialized processes, which are able to handle only certain type of requests. Parts of the operating system are being implemented directly in user processes (client processes). The OS kernel should be more likely oriented through commun ...
Operating System Concept
... or tightly coupled systems) are growing in importance. Such systems have more than one processor ◦ Advantages : 1. Increased throughput 2. Economy of scale 3. Increased reliability ...
... or tightly coupled systems) are growing in importance. Such systems have more than one processor ◦ Advantages : 1. Increased throughput 2. Economy of scale 3. Increased reliability ...
dsmlecture1-spr14 - University of California, Irvine
... often called “glue code”, i.e., it glues independent systems together and makes them work together ...
... often called “glue code”, i.e., it glues independent systems together and makes them work together ...
Chapter 1 Introduction to Operating System Part 1
... -This hides interfaces to I/O devices, filing systems, etc, and provides a programming interface for applications. 4) Kernel -The kernel is the only program resident all the time (all other applications are application programs). ...
... -This hides interfaces to I/O devices, filing systems, etc, and provides a programming interface for applications. 4) Kernel -The kernel is the only program resident all the time (all other applications are application programs). ...
What is an Operating System
... sharing: how are resources shared across users? naming: how are resources named (by users or programs)? security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happen ...
... sharing: how are resources shared across users? naming: how are resources named (by users or programs)? security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happen ...
For Agent Based Software Engineering
... well as the benefits provided by agents to facilitate the developing process and representation of these systems. Traditional software engineering methodologies are not sufficient to be used in the development of such systems because of the special characteristics of the software agent. Therefore, ...
... well as the benefits provided by agents to facilitate the developing process and representation of these systems. Traditional software engineering methodologies are not sufficient to be used in the development of such systems because of the special characteristics of the software agent. Therefore, ...
Background: Operating Systems
... – Don’t want to rewrite apps for each new CPU, each new I/O device ...
... – Don’t want to rewrite apps for each new CPU, each new I/O device ...
Module Guide Operating Systems SCHOOL Science and
... This year 2 module is designed to give an understanding of the principles, application, structure and design principles of operating systems. The module requires a significant practical element delivered as formal laboratory sessions in which computer systems skills are acquired. Learning Outcomes K ...
... This year 2 module is designed to give an understanding of the principles, application, structure and design principles of operating systems. The module requires a significant practical element delivered as formal laboratory sessions in which computer systems skills are acquired. Learning Outcomes K ...
Introduction - Purdue University
... distributed enterprise systems? SABRE and American Airlines were there first. ...
... distributed enterprise systems? SABRE and American Airlines were there first. ...
Distributed System Structures
... • Users are aware of multiplicity of machines. Access to resources of various machines is done explicitly by: – Remote logging into the appropriate remote machine (ssh) ...
... • Users are aware of multiplicity of machines. Access to resources of various machines is done explicitly by: – Remote logging into the appropriate remote machine (ssh) ...
2. OS Components
... o Another option, in an interactive system, is to ask the user (via a sequence of system calls to output the prompting message and to read the response from the terminal) whether to replace the existing file or to abort the program. When both files are set up, we enter a loop o that reads from the i ...
... o Another option, in an interactive system, is to ask the user (via a sequence of system calls to output the prompting message and to read the response from the terminal) whether to replace the existing file or to abort the program. When both files are set up, we enter a loop o that reads from the i ...
Operating Systems for Parallel Processing - Current Activities
... operating system manages the system shared resources used by multiple processes, the process scheduling activity (how processes are allocating on available processors), the communication and synchronization between running processes and so on. Multiprocessors are known as tightly coupled systems and ...
... operating system manages the system shared resources used by multiple processes, the process scheduling activity (how processes are allocating on available processors), the communication and synchronization between running processes and so on. Multiprocessors are known as tightly coupled systems and ...
ppt
... OS is necessary for it to support scalable machines – resource intensive. High cost and reliability issues ...
... OS is necessary for it to support scalable machines – resource intensive. High cost and reliability issues ...
Computer Network and Infrastructure
... User oriented: where the criteria is looked at in from the users point of view System oriented: where the criteria is based on the utilization of the system resources. User-oriented Response Time Elapsed time between the submission of a request until there is output. System-oriented Effect ...
... User oriented: where the criteria is looked at in from the users point of view System oriented: where the criteria is based on the utilization of the system resources. User-oriented Response Time Elapsed time between the submission of a request until there is output. System-oriented Effect ...
What is an Operating System?
... • To allocate the separate resources of the computer as needed to solve the problem given. The allocation process should be as fair and efficient as possible. • As a control program it serves two major functions: (1) supervision of the execution of user programs to prevent errors and improper us ...
... • To allocate the separate resources of the computer as needed to solve the problem given. The allocation process should be as fair and efficient as possible. • As a control program it serves two major functions: (1) supervision of the execution of user programs to prevent errors and improper us ...
What is an operating system? - KOVAN Research Lab
... virtually every computer in the world today PCs, servers, iPods, cell phones, missile guidance systems, etc. all have an OS that dictate how they operate. The OS manages many aspects of how programs run, and how they interact with hardware and the outside world. ...
... virtually every computer in the world today PCs, servers, iPods, cell phones, missile guidance systems, etc. all have an OS that dictate how they operate. The OS manages many aspects of how programs run, and how they interact with hardware and the outside world. ...
Document
... – the OS may provide a system call interface that permits low level interaction between application programs and a device • operating system often buffers data that is moving between devices and application programs’ address spaces – benefits: solve timing, size mismatch problems – drawback: perform ...
... – the OS may provide a system call interface that permits low level interaction between application programs and a device • operating system often buffers data that is moving between devices and application programs’ address spaces – benefits: solve timing, size mismatch problems – drawback: perform ...
An Internet-wide Distributed System for Data-stream Processing
... overstated. Because of this, we intend to configure endhosts with support for “user-level sandboxing” [21]. A sandbox will provide a safe, efficient, and predictable environment for the implementation of overlays, stream processing agents, and application-specific services, including those that moni ...
... overstated. Because of this, we intend to configure endhosts with support for “user-level sandboxing” [21]. A sandbox will provide a safe, efficient, and predictable environment for the implementation of overlays, stream processing agents, and application-specific services, including those that moni ...
Operating Systems – OS Architecture Models
... • A virtual machine takes the layered approach to its logical conclusion. Hardware is simulated in software; all resources are virtualized; individual OS run on virtualized resources • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates th ...
... • A virtual machine takes the layered approach to its logical conclusion. Hardware is simulated in software; all resources are virtualized; individual OS run on virtualized resources • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates th ...
Modern Trends Used In Operating Systems For High Speed
... Time-sharing is the sharing a computing resource among many users by means of multi-programming. The first involved timesharing or time slicing. The idea of multiprogramming was extended to allow for connecting multiple terminals to the computer, with each in-use terminal being associated with one o ...
... Time-sharing is the sharing a computing resource among many users by means of multi-programming. The first involved timesharing or time slicing. The idea of multiprogramming was extended to allow for connecting multiple terminals to the computer, with each in-use terminal being associated with one o ...
Distributed operating system
A distributed operating system is a software over a collection of independent, networked, communicating, and physically separate computational nodes. Each individual node holds a specific software subset of the global aggregate operating system. Each subset is a composite of two distinct service provisioners. The first is a ubiquitous minimal kernel, or microkernel, that directly controls that node’s hardware. Second is a higher-level collection of system management components that coordinate the node's individual and collaborative activities. These components abstract microkernel functions and support user applications.The microkernel and the management components collection work together. They support the system’s goal of integrating multiple resources and processing functionality into an efficient and stable system. This seamless integration of individual nodes into a global system is referred to as transparency, or single system image; describing the illusion provided to users of the global system’s appearance as a single computational entity.