Operating Systems. P. Healy. Spring CS1-08 Computer Science Bldg. tel: Administrive Details Introduction

Transcription

1 Operating Systems P. Healy CS1-08 Computer Science Bldg. tel: Spring

2 Outline 1 2

3 Outline 1 2

4 Lectures / Labs Lecture Hours: Wed. 09h00, CSG25 Thu. 16h00 KBG13 Lab Tue. 10h00 CS304A Tute Tue. 17h00 KB118

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6 Attendance Attendance at all lectures and labs / tutes is mandatory Handing up assigned lab exercises is mandatory

7 Class Home Page 1 All lectures, homeworks, past exams, etc. can be found on the class home page: garryowen.csisdmz.ul.ie/~cs5212/

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9 Instruments Final: 60% Week 15 Mid-Term Exam 15% Week 8 Weekly Lab Projects 20% 4 in total In-class presentation 5% September repeat exam will count for same as final

10 Grade Bands F 0 29 D D C C C B B B A A

11 Reading List 1 Silberschatz, Galvin and Gagne Operating Systems Concepts (8th ed.) (2008) 2 Joh O Gorman: Operating Systems (2000)

12 Reading List 1 Silberschatz, Galvin and Gagne Operating Systems Concepts (8th ed.) (2008) 2 Joh O Gorman: Operating Systems (2000)

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14 Overview of Computer System Organization and Architecture, and Operating System Structure and Operations Process Management Memory Management Storage Management Protection and Security

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16 On successful completion of this module, students should be able to: Explain the objectives and functions of modern operating systems Describe how operating systems have evolved over time from primitive batch systems to sophisticated multi-user systems Analyze the tradeoffs inherent in operating system design Describe the functions of a contemporary operating system with respect to convenience, efficiency, and the ability to evolve Discuss networked, client-server, distributed operating systems and how they differ from single user operating systems

17 (contd.) Identify potential threats to operating systems and the security features design to guard against them Describe how issues such as open source software and the increased use of the Internet are influencing operating system design

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19 To provide an understanding of the major operating system components To provide coverage of basic computer system organization 1 1 Much of this material is drawn from O Gorman s text and from slides based on Silberschatz, Galvin and Gagne s book

20 What is an Operating System? A computer system can be divided into four components Hardware: provides basic computing resources such as CPU, memory and I/O devices Operating System: Controls and coordinates use of hardware among various applications and users Application programs: define the ways in which the system resources are used to solve the computing problems of the user: word processors compilers, web browsers the reason we use computers Users: People, machines, other computers

21 What is an Operating System? (contd.) (Copyright Silberschatz, Galvin and Gagne, 2005.)

22 What is an Operating System? (contd.) OS is a resource allocator Manages all resources Decides between conflicting requests for efficient and fair resource use OS is a control program Controlled execution of programs to prevent errors and improper use of the computer

23 What is an Operating System? (contd.) Some imprecise definitions: Everything [computer software] a vendor ships when you order a new computer is a reasonable approximation but not accurate Operating systems were invented to take away some of the pain of dealing with the raw hardware (O Gorman, 2000)