DOCSLIB.ORG

NASA Engineering and Safety Center Technical Assessment Report

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
NASA Engineering and Safety Center Technical Assessment Report Version: NASA Engineering and Safety Center 1.0 Technical Assessment Report Title: Page #: National Highway Traffic Safety Administration 1 of 177 Toyota Unintended Acceleration Investigation Technical Support to the National Highway Traffic Safety Administration (NHTSA) on the Reported Toyota Motor Corporation (TMC) Unintended Acceleration (UA) Investigation January 18, 2011 NESC Assessment #: TI-10-00618 NASA Engineering and Safety Center Version: 1.0 Technical Assessment Report Title: Page #: National Highway Traffic Safety Administration 2 of 177 Toyota Unintended Acceleration Investigation Report Approval and Revision History Approval and Document Revision History NOTE: This document was approved at the January 13, 2011, NRB. This document was submitted to the NESC Director on January 19, 2011, for configuration control. Approved Original Signature on File 1/19/11 Version: 1.0 NESC Director Date Office of Primary Version Description of Revision Effective Date Responsibility 1.0 Initial Release Michael T. Kirsch, 1/13/11 NESC Principal Engineer, LaRC REDACTION NOTE Since public release of this report on February 8, 2011, the Agency has revised its redactions to the document to release certain material previously deemed confidential under U.S.C. § 30167. This document, which was posted April 15, 2011 to NHTSA’s web site, replaces the one posted previously and contains the Agency’s revised redactions. NESC Assessment #: TI-10-00618 Version: NASA Engineering and Safety Center 1.0 Technical Assessment Report Title: Page #: National Highway Traffic Safety Administration 3 of 177 Toyota Unintended Acceleration Investigation Table of Contents 1.0 Notification and Authorization .................................................................................................. 9 2.0 Signature Page .......................................................................................................................... 10 3.0 Team List ................................................................................................................................... 11 4.0 Executive Summary .................................................................................................................. 13 5.0 Objective and Scope ................................................................................................................. 18 5.1 Vehicle and MY Selection .......................................................................................................... 18 6.0 Analysis ..................................................................................................................................... 19 6.1 Approach .................................................................................................................................... 19 6.2 Analysis of UA VOQs ................................................................................................................ 23 6.2.1 Sources of Information Relating to UA ...................................................................................... 23 6.2.2 Characteristics of the VOQ Data ................................................................................................ 25 6.2.3 Relationship between VOQs and Changes in Vehicle Design ................................................... 29 6.2.4 Classify UA Events to Identify Candidate Failure Modes ......................................................... 30 6.2.5 Warranty Data ............................................................................................................................. 36 6.3 Human Factors on UA Events and Current Trends in Automotive Technologies ..................... 41 6.3.1 Standardization versus Brand Identity ........................................................................................ 41 6.3.2 Reduction of Perceptual Feedback to the Driver ........................................................................ 43 6.3.3 Unintended Consequences of Design Decisions ........................................................................ 44 6.3.4 Migration Toward Shared Control Authority ............................................................................. 44 6.3.5 Challenges of Studying the Human Factors Contributions to UA Events in the Lab ................. 46 6.4 System Overview ........................................................................................................................ 47 6.4.1 System Design ............................................................................................................................ 49 6.4.1.1 Throttle Body Assembly ............................................................................................................. 51 6.4.1.2 Engine Control Module .............................................................................................................. 53 6.4.1.3 Accelerator Pedal ........................................................................................................................ 57 6.4.2 Throttle Control and Effects on Acceleration and Braking ........................................................ 58 6.4.3 Summary of Hardware Evolution ............................................................................................... 60 6.4.4 The Role of Diagnostic Trouble Codes ...................................................................................... 62 6.5 System Fail-Safe Architecture .................................................................................................... 64 6.5.1 System Redundancy ................................................................................................................... 66 6.5.2 System Failures ........................................................................................................................... 68 6.5.2.1 System Level Functional Fault Tree ........................................................................................... 71 6.5.2.2 System Level Failure Responses ................................................................................................ 73 6.5.2.3 System Fail-safe Modes .............................................................................................................. 79 6.5.3 Failure Mitigation ....................................................................................................................... 80 6.5.3.1 Limp Home Mode, Throttle Valve Control Limited .................................................................. 80 6.5.3.2 Engine at Idle .............................................................................................................................. 82 6.5.3.3 Disable Throttle Motor, Throttle held at 6.5 Degrees Spring Loaded Detent ............................ 82 6.5.3.4 Idle Mode Fuel Cut, Engine Speed limited <2500 rpm .............................................................. 82 6.5.3.5 Engine Off Fail-Safe ................................................................................................................... 83 6.6 Functional Areas with Functional Block Diagrams, Test Scenarios, and Test Results .............. 83 6.6.1 Throttle Position Control Functional Area ................................................................................. 87 6.6.1.1 Detailed Implementation Description ......................................................................................... 87 NESC Assessment #: TI-10-00618 Version: NASA Engineering and Safety Center 1.0 Technical Assessment Report Title: Page #: National Highway Traffic Safety Administration 4 of 177 Toyota Unintended Acceleration Investigation 6.6.1.2 Throttle Control Loop Sensitivities and Postulated Faults ......................................................... 91 6.6.2 Accelerator Pedal Control Functional Area ................................................................................ 95 6.6.2.1 Detailed Implementation Description ......................................................................................... 95 6.6.2.2 Pedal Control System Sensitivities and Postulated Faults .......................................................... 99 6.6.2.3 Evaluation of Consumer VOQ #10304368 ............................................................................... 112 6.6.3 Idle Speed Control Functional Area ......................................................................................... 127 6.6.3.1 Detailed Implementation Description ....................................................................................... 127 6.6.3.2 ISC Engine Coolant Temperature ............................................................................................. 128 6.6.3.3 “Idle On” Fuel Cut Function..................................................................................................... 129 6.6.3.4 Idle Speed Control System Sensitivities and Postulated Faults ................................................ 129 6.6.3.5 Engine Coolant Sensor Fault .................................................................................................... 129 6.6.3.6 Engine Speed Signals Corruption ............................................................................................. 129 6.6.3.7 Failed Compensation for Additional Engine Loads ................................................................. 130 6.6.3.8 Summary of Idle Speed Control Potential Faults ..................................................................... 132 6.6.4 Cruise Control
Load more

Recommended publications
  • Graphical Product-Line Configuration of Nesc-Based Sensor Network Applications Using Feature Models
    GRAPHICAL PRODUCT-LINE CONFIGURATION OF NESC-BASED SENSOR NETWORK APPLICATIONS USING FEATURE MODELS by MATTHIAS NIEDERHAUSEN Diplom, University of Applied Sciences, Frankfurt, Germany, 2007 A THESIS submitted in partial fulfillment of the requirements for the degree MASTER OF SCIENCE Department of Computing and Information Sciences College of Engineering KANSAS STATE UNIVERSITY Manhattan, Kansas 2008 Approved by: Major Professor John Hatcliff Copyright Matthias Niederhausen 2008 Abstract Developing a wireless sensor network application includes a variety of tasks, such as coding of the implementation, designing the architecture and assessing availability of hardware components, that provide necessary capabilities. Before compiling an application, the developer has to con- figure the selection of hardware components and set up required parameters. One has to choose from among a variety of configurations regarding communication parameters, such as frequency, channel, subnet identifier, transmission power, etc.. This configuration step also includes setting up parameters for the selection of hardware components, such as a specific hardware platform, which sensor boards and programmer boards to be used or the use of optional services and more. Reasoning about a proper selection of configuration parameters is often very difficult, since there are a lot of dependencies among these parameters which may rule out some other options. The developer has to know about all these constraints in order to pick a valid configuration. Unfor- tunately, the existing makefile approach that comes with nesC is poorly organized and does not capture important compatibility constraints. The configuration of a particular nesC application is distributed in multiple makefiles. There- fore a developer has to look at multiple files to make sure all necessary parameter are set up correctly for compiling a specific application.
    [Show full text]
  • FPGA BASED RECONFIGURABLE BODY AREA NETWORK USING Nios II and Uclinux
    FPGA BASED RECONFIGURABLE BODY AREA NETWORK USING Nios II AND uClinux A Thesis Submitted to the College of Graduate Studies and Research in Partial Fulfillment of the Requirements for the Degree of Master of Science in the Department of Electrical and Computer Engineering University of Saskatchewan by Anthony Voykin Saskatoon, Saskatchewan, Canada c Copyright Anthony Voykin, April 2013. All rights reserved. Permission to Use In presenting this thesis in partial fulfillment of the requirements for a Postgraduate degree from the University of Saskatchewan, it is agreed that the Libraries of this University may make it freely available for inspection. Permission for copying of this thesis in any manner, in whole or in part, for scholarly purposes may be granted by the professors who supervised this thesis work or, in their absence, by the Head of the Department of Electrical and Computer Engineering or the Dean of the College of Graduate Studies and Research at the University of Saskatchewan. Any copying, publication, or use of this thesis, or parts thereof, for financial gain without the written permission of the author is strictly prohibited. Proper recognition shall be given to the author and to the University of Saskatchewan in any scholarly use which may be made of any material in this thesis. Request for permission to copy or to make any other use of material in this thesis in whole or in part should be addressed to: Head of the Department of Electrical and Computer Engineering 57 Campus Drive University of Saskatchewan Saskatoon, Saskatchewan, Canada S7N 5A9 i Acknowledgments I would like to thank my advisors Professor Ron Bolton and Professor Francis Bui for providing me with guidance and support necessary to complete my thesis work.
    [Show full text]
  • Atomicity and Visibility in Tiny Embedded Systems
    Atomicity and Visibility in Tiny Embedded Systems John Regehr Nathan Cooprider David Gay University of Utah, School of Computing Intel Research Berkeley {regehr, coop}@cs.utah.edu [email protected] Abstract bool flag = false; // interrupt handler Visibility is a property of a programming language’s void __vector_5 (void) memory model that determines when values stored by { one concurrent computation become visible to other atomic flag = true; computations. Our work exploits the insight that in } nesC, a C-like language with explicit atomicity, the traditional way of ensuring timely visibility—volatile void wait_for_interrupt(void) variables—can be entirely avoided. This is advan- { tageous because the volatile qualifier is a notorious bool done = false; do { source of programming errors and misunderstandings. atomic if (!flag) done = true; Furthermore, the volatile qualifier hurts performance } while (!done); by inhibiting many more optimizations than are neces- } sary to ensure visibility. In this paper we extend the semantics of nesC’s atomic statements to include a visi- bility guarantee, we show two ways that these semantics Figure 1. nesC code containing a visibility er- can be implemented, and we also show that our better ror implementation has no drawbacks in terms of resource usage. Until now, nesC has left it to programmers to en- 1. Introduction sure visibility by judicious use of C’s volatile qual- ifier. In this paper we investigate the idea of strength- ening nesC’s memory model such that the semantics of The nesC [5] language is a C dialect designed for pro- atomic are augmented with a visibility guarantee. This gramming embedded wireless sensor network nodes.
    [Show full text]
  • A Review on Elliptic Curve Cryptography for Embedded Systems
    International Journal of Computer Science & Information Technology (IJCSIT), Vol 3, No 3, June 2011 A REVIEW ON ELLIPTIC CURVE CRYPTOGRAPHY FOR EMBEDDED SYSTEMS Rahat Afreen 1 and S.C. Mehrotra 2 1Tom Patrick Institute of Computer & I.T, Dr. Rafiq Zakaria Campus, Rauza Bagh, Aurangabad. (Maharashtra) INDIA [email protected] 2Department of C.S. & I.T., Dr. B.A.M. University, Aurangabad. (Maharashtra) INDIA [email protected] ABSTRACT Importance of Elliptic Curves in Cryptography was independently proposed by Neal Koblitz and Victor Miller in 1985.Since then, Elliptic curve cryptography or ECC has evolved as a vast field for public key cryptography (PKC) systems. In PKC system, we use separate keys to encode and decode the data. Since one of the keys is distributed publicly in PKC systems, the strength of security depends on large key size. The mathematical problems of prime factorization and discrete logarithm are previously used in PKC systems. ECC has proved to provide same level of security with relatively small key sizes. The research in the field of ECC is mostly focused on its implementation on application specific systems. Such systems have restricted resources like storage, processing speed and domain specific CPU architecture. KEYWORDS Elliptic curve cryptography Public Key Cryptography, embedded systems, Elliptic Curve Digital Signature Algorithm ( ECDSA), Elliptic Curve Diffie Hellman Key Exchange (ECDH) 1. INTRODUCTION The changing global scenario shows an elegant merging of computing and communication in such a way that computers with wired communication are being rapidly replaced to smaller handheld embedded computers using wireless communication in almost every field. This has increased data privacy and security requirements.
    [Show full text]
  • Aicesis Presidency
    20 YEARS 1999 2019 INTERNATIONAL ASSOCIATION OF ECONOMIC AND SOCIAL COUNCILS AND SIMILAR INSTITUTIONS President Iacob Baciu AICESIS PRESIDENCY SEPTEMBER 2017-OCTOBER 2019 President Iacob Baciu AICESIS PRESIDENCY – SEPTEMBER 2017-OCTOBER 2019 BOARD AND GENERAL ASSEMBLY INTERNATIONAL CONFERENCE ILO-AICESIS-ESC OF ROMANIA 9 – 11 OCTOBER 2019, BUCHAREST, ROMANIA AICESIS PRESIDENCY BETWEEN SEPTEMBER 2017 AND OCTOBER 2019 President Iacob Baciu I had the privilege and honour of being the President of the International Asso- ciation of Economic and Social Councils and Similar Institutions (AICESIS) for a two-year term, from September 2017 to October 2019, and the main theme of my mandate was the digital revolution. Industry 4.0, as named by Chancellor Angela Merkel in 2011, represents the fourth stage of the Industrial Revolution and has brought major changes in the economy, labour relations, labour market, education, significantly influencing social life. The next industrial revolution finds itself on an unknown horizon and is difficult to predict. Humanity has come a long way in seeking its solutions to the problems it faces; history has recorded all the achievements, hesitations, mistakes, conflicts and progress made. Only if we learn from experience will we be able to avoid repeating the mistakes made. The first industrial revolution began at the end of the eighteenth century and in the first decades of the nineteenth century first in England, which managed to remain the world’s first industrial power until the end of the nineteenth century. In France, the industrial revolution evolved slowly, its beginnings dating back to the 1830s. The low demand for industrial products under a predominantly agrarian population meant that the true industrial era began only in 1890.
    [Show full text]
  • Cyber-Physical Codesign of Distributed Structural Health
    1 Cyber-Physical Codesign of Distributed Structural Health Monitoring with Wireless Sensor Networks Gregory Hackmann, Weijun Guo, Guirong Yan, Zhuoxiong Sun, Chenyang Lu, and Shirley Dyke Abstract—Our deteriorating civil infrastructure faces the critical challenge of long-term structural health monitoring for damage detection and localization. In contrast to existing research that often separates the designs of wireless sensor networks and structural engineering algorithms, this paper proposes a cyber-physical co-design approach to structural health monitoring based on wireless sensor networks. Our approach closely integrates (1) flexibility-based damage localization methods that allow a tradeoff between the number of sensors and the resolution of damage localization, and (2) an energy-efficient, multi-level computing architecture specifically designed to leverage the multi-resolution feature of the flexibility-based approach. The proposed approach has been implemented on the Intel Imote2 platform. Experiments on a simulated truss structure and a real, full-scale truss structure demonstrate the system’s efficacy in damage localization and energy efficiency. Index Terms—wireless sensor networks, structural health monitoring, cyber-physical systems F 1 INTRODUCTION lantern batteries [29]. The high latency and relatively short lifetime arose from the underlying SHM method Deterioration of civil infrastructure is a growing problem being designed separately from the WSN system. The in the US and around the world. For example, during SHM method required the WSN to reliably deliver the their lifetimes, bridges face environmental corrosion, entire raw sensor dataset to the base station for cen- persistent traffic and wind loading, extreme earthquake tralized processing, inherently placing a high network events, material aging, etc., which inevitably result in burden on the WSN system.
    [Show full text]
  • Future-Proofing the Connected World: 13 Steps to Developing Secure Iot Products
    Future-proofing the Connected World: 13 Steps to Developing Secure IoT Products Presented by the IoT Working Group Table of Contents Forward Introduction Document Scope The Need for IoT Security IoT Products Can Compromise Privacy IoT products can lend their computing power to launch DDoS Attacks Medical Devices and Medical Standard Protocols are Vulnerable to Attack Drones Are Approaching Mainstream Status and Being Used as a Platform for Reconnaissance Critical national infrastructure can rely on the IoT ecosystem Cars are becoming connected and autonomous Moving Forward Why Development Organizations Should Care About Securing IoT Products IoT Device Security Challenges IoT products may be deployed in insecure or physically exposed environments Security is new to many manufacturers and there is limited security planning in development methodologies Security is not a business driver and there is limited security sponsorship and management support in development of IoT products There is a lack of defined standards and reference architecture for secure IoT development There are difficulties recruiting and retaining requisite skills for IoT development teams including architects, secure software engineers, hardware security engineers, and security testing staff The low price point increases the potential adversary pool Resource constraints in embedded systems limit security options IoT Security Survey Guidance for Secure IoT Development 1. Start with a Secure Development Methodology Security Requirements Security Processes Perform Safety Impact Assessment Perform Threat Modeling 2. Implement a Secure Development and Integration Environment Evaluate Programming Languages OWASP Python Security Project Link Integrated Development Environments Continuous Integration Plugins Testing and Code Quality Processes 3. Identify Framework and Platform Security Features Selecting an Integration Framework Evaluate Platform Security Features 4.
    [Show full text]
  • Internet of Things (Iot) Operating Systems Management: Opportunities, Challenges, and Solution
    sensors Editorial Internet of Things (IoT) Operating Systems Management: Opportunities, Challenges, and Solution Yousaf Bin Zikria 1, Sung Won Kim 1,*, Oliver Hahm 2, Muhammad Khalil Afzal 3 and Mohammed Y. Aalsalem 4 1 Department of Information and Communication Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Korea; [email protected] 2 Zühlke Group, Eschborn, 65760 Hessen, Germany; [email protected] 3 Department of Computer Science, COMSATS University Islamabad, Wah Campus, Wah Cantt 47010, Pakistan; [email protected] 4 Department of Computer Networks, Jazan University, Jazan 45142, Saudi Arabia; [email protected] * Correspondence: [email protected]; Tel.: +82-53-810-4742 Received: 9 April 2019; Accepted: 11 April 2019; Published: 15 April 2019 Abstract: Internet of Things (IoT) is rapidly growing and contributing drastically to improve the quality of life. Immense technological innovations and growth is a key factor in IoT advancements. Readily available low cost IoT hardware is essential for continuous adaptation of IoT. Advancements in IoT Operating System (OS) to support these newly developed IoT hardware along with the recent standards and techniques for all the communication layers are the way forward. The variety of IoT OS availability demands to support interoperability that requires to follow standard set of rules for development and protocol functionalities to support heterogeneous deployment scenarios. IoT requires to be intelligent to self-adapt according to the network conditions. In this paper, we present brief overview of different IoT OSs, supported hardware, and future research directions. Therein, we provide overview of the accepted papers in our Special Issue on IoT OS management: opportunities, challenges, and solution.
    [Show full text]
  • Tinyos Programming I
    Programming TinyOS Lesson 1 Some of the content from these slides were adapted from the Crossbow Tutorials What is TinyOS? A small operating system for Microcontrollers – Create a uniform abstraction (e.g. Device Abstraction) An Open-Source Development Environment A Component Based Architecture A Programming Language & Model – nesC Language 1 nesC nesC is an extension of C Application (nesC) Built on top of avg-gcc TinyOS Kernel (C) nesC “Static Language” TinyOS Libs (nesC) Compiler – No Dynamic Memory (no malloc) – No Function Pointers Application & TinyOS (C) – No Heap TinyOS evolved to nesC Java influence C Compiler nesC uses the filename extension ".nc" Application Executable Programming Model Separation of construction and composition Specification of component behavior in terms of set of interfaces. Components are statically linked together Finite State Machine Programming Style – Non-blocking 2 Basic Constructs Commands – Cause action to be initiated. Application Events – Call back to notify action has occurred and give results. command Tasks – Background computation, non-time critical event Modules – Component implemented with C Code Component Configurations – Component implemented with task Wires Interfaces – specifications of bi-directional event command communications for the components Hardware Main.nc Basic Concepts appxxx.nc (wires) Interfaces (xxx.nc) interfaceA.nc Specifies functionality to outside world what commands can be called interfaceA.nc interfaceA.nc what events need handling comp1C.nc comp2M.nc Software Components (wires) (code) interfaceB.nc – Module (xxxM.nc) Code implementation Code for Interface functions interfaceB.nc – Configuration (xxxC.nc) Linking/wiring of components comp3M.nc When top level app, (code) drop C from filename xxx.nc 3 The Design of TinyOS TinyOS/nesC is designed to speed application development through code reuse.
    [Show full text]
  • Security and Privacy in the Internet of Things
    Security and Privacy in the Internet of Things Elisa Bertino CS Department and Cyber2SLab [email protected] The IoT – Wikipedia • The Internet of Things (IoT) is the network of physical objects or "things" embedding electronics, software, and network connectivity, which enables these objects to collect and exchange data. • The IoT allows objects to be sensed and controlled remotely across existing network infrastructure, creating opportunities for more Diagram from K. Angrisci “Turning IoT into Internet of direct integration between the physical world Vulnerabilities: IoT Botnets” and computer-based systems. • When IoT is augmented with sensors and actuators, the technology becomes an instance of the more general class of cyber- physical systems, which also encompasses technologies such as smart grids, smart homes, intelligent transportation and smart cities. Edge Computing Conventional cloud computing paradigm Edge computing paradigm Diagrams from paper: W. Shi et al, “Edge Computing: Vision and Challenges”, IoT Journal, Oct. 2016 Industrial IoT (IIoT) Diagrams and examples from Accenture “Driving the Unconventional Growth through the Industrial Internet of Things”, 2015, downloaded from https://www.accenture.com/us- en/_acnmedia/Accenture/next-gen/reassembling- industry/pdf/Accenture-Driving-Unconventional-Growth- through-IIoT.pdf Industrial IoT (IIoT) Diagram from BSQUARE. Annual IIOT Maturity Survey. 2017 IoT - Risks IoT dramatically expands the attack surface • IoT systems do not have well defined perimeters • IoT systems are highly dynamic and continuously evolve because of mobility • IoT are highly heterogeneous with respect to: q Communication q Platform q Devices • IoT systems may include physically unprotected portions • IoT systems are highly autonomous and control other autonomous systems • IoT systems may include “objects” not designed to be connected to the Internet • Human interaction with all the devices is not scalable IoT - Risks The OWASP Internet of Things Top 10 - 2014 1.
    [Show full text]
  • Programming in Nesc (And TOSSIM) Questions
    Programming in nesC (and TOSSIM) Professor Jack Stankovic Department of Computer Science University of Virginia Questions • How do you program these wireless sensor devices? nesC • How do you debug your code on a PC? TOSSIM – Lab 3 • How do you download your code? Lab 0 • How do you debug the system? Message Center – Lab 2 1 Questions • What else do you need to know? – TinyOS • Why nesC? – Most widely used – Example of systems language for embedded systems Helpful Materials • Labs and Lab materials – see class web site • Handouts – read • Read: – The nesC Language: A Holistic Approach to Networked Embedded Systems, D. Gay, et. al., PLDI, 2003 (sections 1-4 inclusive) • Google to find TinyOS tutorial 2 Outline • Overview • Main Elements and Examples • Task Model and Concurrency • More Coding Details • Examples • Message Center (Lab 2; intro in class) • TOSSIM • Summary TinyOS and nesC Paradigm • Component-based • TinyOS, libraries, applications written in nesC • Intended for embedded systems and WSN • C-like syntax (new keywords) – Call, signal, task, post, async, … • TinyOS concurrency model (tasks and events) 3 TinyOS and nesC Paradigm • No dynamic memory • nesC bi-directional interface is an excellent fit for event driven systems • Race conditions checked at compile time Big Picture • Write components; use components written by others – Will need new keywords/framework for defining components • Glue components together – Called wiring – Configuration file • Bi-directional interfaces • Concurrency/Execution Model – Tasks – Event handlers
    [Show full text]
  • Les Systèmes D'exploitation
    Les Systèmes d’Exploitation RTX M. DALMAU - IUT de Bayonne - Les systèmes d'exploitation 1 Objectifs • Comprendre comment fonctionne un SE – Ce qu’il gère – Comment il le gère – Sécurité • Savoir utiliser les possibilités du SE dans les programmes – Utiliser les ressources – Exploiter le parallélisme (multiprocesseur / multithreading) – Faire communiquer des processus – Synchroniser des processus M. DALMAU - IUT de Bayonne - Les systèmes d'exploitation 2 Les Systèmes d’Exploitation 1. Introduction 2. Les Processus 3. Les Threads 4. Concurrence entre processus 5. Communication entre processus 6. Les interruption logicielles (signaux) 7. Gestion de la mémoire 8. Ordonnancement 9. Les Entrées/Sorties 10. Le système de fichiers 11. Démarrage d’un système 12. Interblocage 13. Sécurité 14. Systèmes multiprocesseurs M. DALMAU - IUT de Bayonne - Les systèmes d'exploitation 3 Définitions possibles • Machine étendue : Fournir une vision de la machine plus simple à utiliser c’est-à-dire des services pour la mémoire, l’UE, … • Gestionnaire de ressources : Partager les ressources dans le temps et l'espace – dans le temps par exemple partager le CPU – dans l'espace par exemple partager la mémoire, le disque, … M. DALMAU - IUT de Bayonne - Les systèmes d'exploitation 4 Point de vue historique • Au début les SE étaient mono processus car on faisait surtout du calcul donc on utilisait le CPU au maximum. • Plus tard, programmes interactifs et avec fichiers => beaucoup d'attente sur l'UE => le CPU est sous utilisé => changer de processus quand le processus courant est en attente = multiprogrammation. • Puis temps partagé (le 1er est CTSS – Compatible Time Sharing System – du MIT - 1961) qui devient MULTICS (MULTIplexed Information and Computing System -1964) qui donnera UNIX (1978) puis LINUX (1991).
    [Show full text]