Operating System
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Chapter 1: Introduction What Is an Operating System?
Chapter 1: Introduction What is an Operating System? Mainframe Systems Desktop Systems Multiprocessor Systems Distributed Systems Clustered System Real -Time Systems Handheld Systems Computing Environments Operating System Concepts 1.1 Silberschatz, Galvin and Gagne 2002 What is an Operating System? A program that acts as an intermediary between a user of a computer and the computer hardware. Operating system goals: ) Execute user programs and make solving user problems easier. ) Make the computer system convenient to use. Use the computer hardware in an efficient manner. Operating System Concepts 1.2 Silberschatz, Galvin and Gagne 2002 1 Computer System Components 1. Hardware – provides basic computing resources (CPU, memory, I/O devices). 2. Operating system – controls and coordinates the use of the hardware among the various application programs for the various users. 3. Applications programs – define the ways in which the system resources are used to solve the computing problems of the users (compilers, database systems, video games, business programs). 4. Users (people, machines, other computers). Operating System Concepts 1.3 Silberschatz, Galvin and Gagne 2002 Abstract View of System Components Operating System Concepts 1.4 Silberschatz, Galvin and Gagne 2002 2 Operating System Definitions Resource allocator – manages and allocates resources. Control program – controls the execution of user programs and operations of I/O devices . Kernel – the one program running at all times (all else being application programs). -
CWIC: Using Images to Passively Browse the Web
CWIC: Using Images to Passively Browse the Web Quasedra Y. Brown D. Scott McCrickard Computer Information Systems College of Computing and GVU Center Clark Atlanta University Georgia Institute of Technology Atlanta, GA 30314 Atlanta, GA 30332 [email protected] [email protected] Advisor: John Stasko ([email protected]) Abstract The World Wide Web has emerged as one of the most widely available and diverse information sources of all time, yet the options for accessing this information are limited. This paper introduces CWIC, the Continuous Web Image Collector, a system that automatically traverses selected Web sites collecting and analyzing images, then presents them to the user using one of a variety of available display mechanisms and layouts. The CWIC mechanisms were chosen because they present the images in a non-intrusive method: the goal is to allow users to stay abreast of Web information while continuing with more important tasks. The various display layouts allow the user to select one that will provide them with little interruptions as possible yet will be aesthetically pleasing. 1 1. Introduction The World Wide Web has emerged as one of the most widely available and diverse information sources of all time. The Web is essentially a multimedia database containing text, graphics, and more on an endless variety of topics. Yet the options for accessing this information are somewhat limited. Browsers are fine for surfing, and search engines and Web starting points can guide users to interesting sites, but these are all active activities that demand the full attention of the user. This paper introduces CWIC, a passive-browsing tool that presents Web information in a non-intrusive and aesthetically pleasing manner. -
Concept-Oriented Programming: References, Classes and Inheritance Revisited
Concept-Oriented Programming: References, Classes and Inheritance Revisited Alexandr Savinov Database Technology Group, Technische Universität Dresden, Germany http://conceptoriented.org Abstract representation and access is supposed to be provided by the translator. Any object is guaranteed to get some kind The main goal of concept-oriented programming (COP) is of primitive reference and a built-in access procedure describing how objects are represented and accessed. It without a possibility to change them. Thus there is a makes references (object locations) first-class elements of strong asymmetry between the role of objects and refer- the program responsible for many important functions ences in OOP: objects are intended to implement domain- which are difficult to model via objects. COP rethinks and specific structure and behavior while references have a generalizes such primary notions of object-orientation as primitive form and are not modeled by the programmer. class and inheritance by introducing a novel construct, Programming means describing objects but not refer- concept, and a new relation, inclusion. An advantage is ences. that using only a few basic notions we are able to describe One reason for this asymmetry is that there is a very many general patterns of thoughts currently belonging to old and very strong belief that it is entity that should be in different programming paradigms: modeling object hier- the focus of modeling (including programming) while archies (prototype-based programming), precedence of identities simply serve entities. And even though object parent methods over child methods (inner methods in identity has been considered “a pillar of object orienta- Beta), modularizing cross-cutting concerns (aspect- tion” [Ken91] their support has always been much weaker oriented programming), value-orientation (functional pro- in comparison to that of entities. -
Technical Manual Version 8
HANDLE.NET (Ver. 8) Technical Manual HANDLE.NET (version 8) Technical Manual Version 8 Corporation for National Research Initiatives June 2015 hdl:4263537/5043 1 HANDLE.NET (Ver. 8) Technical Manual HANDLE.NET 8 software is subject to the terms of the Handle System Public License (version 2). Please read the license: http://hdl.handle.net/4263537/5030. A Handle System Service Agreement is required in order to provide identifier/resolution services using the Handle System technology. Please read the Service Agreement: http://hdl.handle.net/4263537/5029. © Corporation for National Research Initiatives, 2015, All Rights Reserved. Credits CNRI wishes to thank the prototyping team of the Los Alamos National Laboratory Research Library for their collaboration in the deployment and testing of a very large Handle System implementation, leading to new designs for high performance handle administration, and handle users at the Max Planck Institute for Psycholinguistics and Lund University Libraries NetLab for their instructions for using PostgreSQL as custom handle storage. Version Note Handle System Version 8, released in June 2015, constituted a major upgrade to the Handle System. Major improvements include a RESTful JSON-based HTTP API, a browser-based admin client, an extension framework allowing Java Servlet apps, authentication using handle identities without specific indexes, multi-primary replication, security improvements, and a variety of tool and configuration improvements. See the Version 8 Release Notes for details. Please send questions or comments to the Handle System Administrator at [email protected]. 2 HANDLE.NET (Ver. 8) Technical Manual Table of Contents Credits Version Note 1 Introduction 1.1 Handle Syntax 1.2 Architecture 1.2.1 Scalability 1.2.2 Storage 1.2.3 Performance 1.3 Authentication 1.3.1 Types of Authentication 1.3.2 Certification 1.3.3 Sessions 1.3.4 Algorithms TODO 3 HANDLE.NET (Ver. -
Pointers Getting a Handle on Data
3RLQWHUV *HWWLQJ D +DQGOH RQ 'DWD Content provided in partnership with Prentice Hall PTR, from the book C++ Without Fear: A Beginner’s Guide That Makes You Feel Smart, 1/e by Brian Overlandà 6 Perhaps more than anything else, the C-based languages (of which C++ is a proud member) are characterized by the use of pointers—variables that store memory addresses. The subject sometimes gets a reputation for being difficult for beginners. It seems to some people that pointers are part of a plot by experienced programmers to wreak vengeance on the rest of us (because they didn’t get chosen for basketball, invited to the prom, or whatever). But a pointer is just another way of referring to data. There’s nothing mysterious about pointers; you will always succeed in using them if you follow simple, specific steps. Of course, you may find yourself baffled (as I once did) that you need to go through these steps at all—why not just use simple variable names in all cases? True enough, the use of simple variables to refer to data is often sufficient. But sometimes, programs have special needs. What I hope to show in this chapter is why the extra steps involved in pointer use are often justified. The Concept of Pointer The simplest programs consist of one function (main) that doesn’t interact with the network or operating system. With such programs, you can probably go the rest of your life without pointers. But when you write programs with multiple functions, you may need one func- tion to hand off a data address to another. -
KTH Introduction to Opencl
Introduction to OpenCL David Black-Schaffer [email protected] 1 Disclaimer I worked for Apple developing OpenCL I’m biased Please point out my biases. They help me get a better perspective and may reveal something. 2 What is OpenCL? Low-level language for high-performance heterogeneous data-parallel computation. Access to all compute devices in your system: CPUs GPUs Accelerators (e.g., CELL… unless IBM cancels Cell) Based on C99 Portable across devices Vector intrinsics and math libraries Guaranteed precision for operations Open standard Low-level -- doesn’t try to do everything for you, but… High-performance -- you can control all the details to get the maximum performance. This is essential to be successful as a performance- oriented standard. (Things like Java have succeeded here as standards for reasons other than performance.) Heterogeneous -- runs across all your devices; same code runs on any device. Data-parallel -- this is the only model that supports good performance today. OpenCL has task-parallelism, but it is largely an after-thought and will not get you good performance on today’s hardware. Vector intrinsics will map to the correct instructions automatically. This means you don’t have to write SSE code anymore and you’ll still get good performance on scalar devices. The precision is important as historically GPUs have not cared about accuracy as long as the images looked “good”. These requirements are forcing them to take accuracy seriously.! 3 Open Standard? Huge industry support Driving hardware requirements This is a big deal. Note that the big three hardware companies are here (Intel, AMD, and Nvidia), but that there are also a lot of embedded companies (Nokia, Ericsson, ARM, TI). -
Personal-Computer Systems • Parallel Systems • Distributed Systems • Real -Time Systems
Module 1: Introduction • What is an operating system? • Simple Batch Systems • Multiprogramming Batched Systems • Time-Sharing Systems • Personal-Computer Systems • Parallel Systems • Distributed Systems • Real -Time Systems Applied Operating System Concepts 1.1 Silberschatz, Galvin, and Gagne Ď 1999 What is an Operating System? • A program that acts as an intermediary between a user of a computer and the computer hardware. • Operating system goals: – Execute user programs and make solving user problems easier. – Make the computer system convenient to use. • Use the computer hardware in an efficient manner. Applied Operating System Concepts 1.2 Silberschatz, Galvin, and Gagne Ď 1999 Computer System Components 1. Hardware – provides basic computing resources (CPU, memory, I/O devices). 2. Operating system – controls and coordinates the use of the hardware among the various application programs for the various users. 3. Applications programs – define the ways in which the system resources are used to solve the computing problems of the users (compilers, database systems, video games, business programs). 4. Users (people, machines, other computers). Applied Operating System Concepts 1.3 Silberschatz, Galvin, and Gagne Ď 1999 Abstract View of System Components Applied Operating System Concepts 1.4 Silberschatz, Galvin, and Gagne Ď 1999 Operating System Definitions • Resource allocator – manages and allocates resources. • Control program – controls the execution of user programs and operations of I/O devices . • Kernel – the one program running at all times (all else being application programs). Applied Operating System Concepts 1.5 Silberschatz, Galvin, and Gagne Ď 1999 Memory Layout for a Simple Batch System Applied Operating System Concepts 1.7 Silberschatz, Galvin, and Gagne Ď 1999 Multiprogrammed Batch Systems Several jobs are kept in main memory at the same time, and the CPU is multiplexed among them. -
System Automation for Z/OS : Planning and Installation About This Publication
System Automation for z/OS Version 4.Release 1 Planning and Installation IBM SC34-2716-01 Note Before using this information and the product it supports, read the information in Appendix H, “Notices,” on page 201. Edition Notes This edition applies to IBM System Automation for z/OS® (Program Number 5698-SA4) Version 4 Release 1, an IBM licensed program, and to all subsequent releases and modifications until otherwise indicated in new editions. This edition replaces SC34-2716-00. © Copyright International Business Machines Corporation 1996, 2017. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Figures................................................................................................................. xi Tables................................................................................................................ xiii Accessibility........................................................................................................ xv Using assistive technologies...................................................................................................................... xv Keyboard navigation of the user interface................................................................................................. xv About this publication........................................................................................ xvii Who Should Use This Publication.............................................................................................................xvii -
COSC 6385 Computer Architecture - Multi-Processors (IV) Simultaneous Multi-Threading and Multi-Core Processors Edgar Gabriel Spring 2011
COSC 6385 Computer Architecture - Multi-Processors (IV) Simultaneous multi-threading and multi-core processors Edgar Gabriel Spring 2011 Edgar Gabriel Moore’s Law • Long-term trend on the number of transistor per integrated circuit • Number of transistors double every ~18 month Source: http://en.wikipedia.org/wki/Images:Moores_law.svg COSC 6385 – Computer Architecture Edgar Gabriel 1 What do we do with that many transistors? • Optimizing the execution of a single instruction stream through – Pipelining • Overlap the execution of multiple instructions • Example: all RISC architectures; Intel x86 underneath the hood – Out-of-order execution: • Allow instructions to overtake each other in accordance with code dependencies (RAW, WAW, WAR) • Example: all commercial processors (Intel, AMD, IBM, SUN) – Branch prediction and speculative execution: • Reduce the number of stall cycles due to unresolved branches • Example: (nearly) all commercial processors COSC 6385 – Computer Architecture Edgar Gabriel What do we do with that many transistors? (II) – Multi-issue processors: • Allow multiple instructions to start execution per clock cycle • Superscalar (Intel x86, AMD, …) vs. VLIW architectures – VLIW/EPIC architectures: • Allow compilers to indicate independent instructions per issue packet • Example: Intel Itanium series – Vector units: • Allow for the efficient expression and execution of vector operations • Example: SSE, SSE2, SSE3, SSE4 instructions COSC 6385 – Computer Architecture Edgar Gabriel 2 Limitations of optimizing a single instruction -
Chapter 20: the Linux System
Chapter 20: The Linux System Operating System Concepts – 10th dition Silberschatz, Galvin and Gagne ©2018 Chapter 20: The Linux System Linux History Design Principles Kernel Modules Process Management Scheduling Memory Management File Systems Input and Output Interprocess Communication Network Structure Security Operating System Concepts – 10th dition 20!2 Silberschatz, Galvin and Gagne ©2018 Objectives To explore the history o# the UNIX operating system from hich Linux is derived and the principles upon which Linux’s design is based To examine the Linux process model and illustrate how Linux schedules processes and provides interprocess communication To look at memory management in Linux To explore how Linux implements file systems and manages I/O devices Operating System Concepts – 10th dition 20!" Silberschatz, Galvin and Gagne ©2018 History Linux is a modern, free operating system (ased on $NIX standards First developed as a small (ut sel#-contained kernel in -.91 by Linus Torvalds, with the major design goal o# UNIX compatibility, released as open source Its history has (een one o# collaboration by many users from all around the orld, corresponding almost exclusively over the Internet It has been designed to run efficiently and reliably on common PC hardware, but also runs on a variety of other platforms The core Linux operating system kernel is entirely original, but it can run much existing free UNIX soft are, resulting in an entire UNIX-compatible operating system free from proprietary code Linux system has -
System Automation for Z/OS: User's Guide
System Automation for z/OS Version 4 .Release 1 User’s Guide IBM SC34-2718-01 Note Before using this information and the product it supports, be sure to read the general information under Appendix E, “Notices,” on page 209. Editions This edition applies to IBM® System Automation for z/OS (Program Number 5698-SA4) Version 4 Release 1, an IBM licensed program, and to all subsequent releases and modifications until otherwise indicated in new editions or technical newsletters. This edition replaces SC34-2718-00. © Copyright International Business Machines Corporation 1996, 2017. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Figures................................................................................................................. ix Tables................................................................................................................ xiii Accessibility........................................................................................................ xv Using assistive technologies...................................................................................................................... xv Keyboard navigation of the user interface................................................................................................. xv Notices.............................................................................................................. xvii Website Disclaimer................................................................................................................................. -
IMS High Performance System Generation Tools: User's Guide Part 1
IBM IMS High Performance System Generation Tools for z/OS 2.4 User's Guide IBM SC27-9501-01 Note: Before using this information and the product it supports, read the information in “Notices” on page 435. Second Edition (May 2021) This edition applies to Version 2.4 of IBM IMS High Performance System Generation Tools for z/OS (program number 5655-P43) and to all subsequent releases and modifications until otherwise indicated in new editions. This edition replaces SC27-9501-00. © Copyright International Business Machines Corporation 2001, 2021. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents About this information.......................................................................................... ix Part 1. IMS High Performance System Generation Tools overview........................... 1 Chapter 1. IMS High Performance System Generation Tools overview..................................................... 3 What's new in IMS High Performance System Generation Tools..........................................................3 IMS system definition.............................................................................................................................5 What does IMS High Performance System Generation Tools do?........................................................ 6 IMS High Performance System Generation Tools components............................................................ 6 IMS High Performance System Generation Tools components