CS-502 Operating Systems Fall 2007

IntroductionCS-502 Fall 2007 1

CS-502 Operating SystemsFall 2007

Hugh C. LauerAdjunct Professor


Outline for Today

• Logistics and Details of this Course

• Introductions

• Discussion – What is an Operating System?

• Introduction to Concurrency

• Project Assignment• Virtual Machines

• Term Project Assignment


Why an Operating Systems course?

• WPI CS requirements• “Core area” for both grads and undergrads

• Understanding of inner workings of “systems”• Exposure to diversity of operating systems• OS-related assignments you may see in real life:–

• “Design and develop an operating system to do THIS” (not probable)

• “Select an operating system for a product that will do THAT” (probable)

• “Design and develop this application on THAT system to exploit its special features” (likely)


This Course

• One 3-hour class per week, 14 weeks• September 10 – December 10• No break during Thanksgiving week

• Concentrated reading and project work

• No time to take another course while holding a full-time job!


Textbook and Web

• Text Book:– (required) Operating Systems Concepts, 7th edition, by

Silberschatz, Galvin, and Gagne, John Wiley and Sons, 2005

– (required) Linux Kernel Design, 2nd edition, by Robert Love, Novell Press, 2005

– (supplemental) Modern Operating Systems, 2nd edition, by Andrew S. Tanenbaum, Prentice Hall, 2001

• Course Information:– http://web.cs.wpi.edu/~cs502/f07/

http://web.cs.wpi.edu/~cs502/f07/


Prerequisites

• Prerequisites:– C/C++ programming– Data structures– Unix/Linux user experience and access– Computer Organization

• Reading assignment– Silbershatz Chapters 1 and 2

• Especially §2.8 about virtual machines


More on Prerequisites

• No time to try to “pick up” C programming• Java-only programmers will find it challenging

• C++-only programmers may also find it challenging

• Time required• 15+ hours per week average, 14 weeks total

• 3 graduate courses per term is normal load for full time student

• Computing resources required• Modern PC or Mac with > 8 gigabytes of free disk space

• Ability to install VMware Player software

• 2nd best: install client software to access VMware Server on CS Department machines


Schedule & Logistics

• Schedule– Fuller Labs – Room 320– 6:00 PM to 8:50 PM – Approx two 5 minute breaks

around 7PM, 8PM– 14 classes– No break for Thanksgiving!– Term Project & Final Exam –

Monday, December 10, 2006

• 4-5 Programming Projects– 2-3 weeks each

• Mobile Phones, pagers and other similar devices OFF during class

• If you need to eat during class– Please be QUIET– Avoid spicy or savory aromas

(pot stickers, curries, etc.)

• Office Hours– by appointment– will try to be in Adjunct

Office, Fuller 239, by 4:30 PM on Monday afternoons

• Contact– <Professor’s last name> @

cs.wpi.edu– Adjunct office phone:–

(508) 831-6470 (shared)


Exams and Quizzes

• Final exam on December 10– 1.5–2.0 hours

– May include lecture material introduced earlier that same evening

– Closed book, one 8½ x 11 sheet of prepared notes(2 sides)

– Bring calculator

• Two or more unannounced quizzes– Closed book, no notes

– Calculator may be useful


Grading

• Grading– Exams & quizzes – ~30%– Programming Projects – ~30%– Term Project – ~20%– Class participation and written homework – ~20%

• Unless otherwise noted, assignments are to be completed individually, not groups

• Late Policy – 10% per day– But contact Professor for extenuating circumstances

• WPI Academic Honesty policy


Ground Rule

• There are no “stupid” questions.

• It is a waste of your time and the class’s time to proceed when you don’t understand the basic terms.

• If you don’t understand it, someone else probably doesn’t it, either.


Programming Projects

• Project work based on OpenSUSE Linux 10.2

• Each student will get a “virtual machine”• What is a virtual machine? (§2.8 in Silbershatz)

• Build, modify, install Linux kernel on your virtual machine

• Debug, analyze, crash

• Restore, try again


Programming Projects (continued)

• Similar to Fossil Lab• http://fossil.wpi.edu

• However,• Does not require physical presence on campus

• Does require you to install VMware software on your home or office PC

http://fossil.wpi.edu/


Ways to Use your Virtual Machine

• Use VMware Player (or other VMware software) on your own PC– See DVD and handout for instructions.

• Use CS Department server– Sign up for login ID at http://www.cs.wpi.edu/Account

– Instructions to follow

• Macintosh Parallels– See instructor

http://www.cs.wpi.edu/Account




Questions?


Outline for Today


• Introductions



• Project Assignment

• Virtual Machines



Introductions

• Who are you?– Name, year, major and/or degree program– Full time student? Work experience in

computing, etc.? Employer?

• C & C++ experience– Other programming experience

• Previous degree and where• Why CS502– Operating Systems?• Anything else relevant?


Instructor — Hugh C. LauerAdjunct Professor

• Ph. D. Carnegie-Mellon 1972-73– Dissertation “Correctness in Operating Systems”

• Lecturer: University of Newcastle upon Tyne, UK• Approximately 30 years in industry in USA• Research topics

– Operating Systems– Proofs of Correctness– Computer Architecture– Networks and Distributed Computing– Real-time networking– 3D Volume Rendering– Surgical Simulation and Navigation– …


Systems Experience

• IBM Corporation• University of Newcastle• Systems Development Corporation• Xerox Corporation (Palo Alto)• Software Arts, Inc.• Apollo Computer• Eastman Kodak Company• Mitsubishi Electric Research Labs (MERL)• Real-Time Visualization

• Founded and spun out from MERL• Acquired by TeraRecon, Inc.

• SensAble Technologies, Inc.• Dimensions Imaging, Inc. (new start-up)


VolumePro™

• Interactive volume rendering of 3D data such as• MRI scans

• CT scans

• Seismic scans

• Two generations of ASICs, boards, software• VolumePro 500 – 1999

• VolumePro 1000 – 2001

• CTO, Chief Architect of VolumePro 1000• 7.5-million gate, high-performance ASIC

• 109 Phong-illuminated samples per second


Sample images from VolumePro


Operating Systems I have known

• IBSYS (IBM 7090)

• OS/360 (IBM 360)

• TSS/360 (360 mod 67)

• Michigan Terminal System (MTS)

• CP/CMS & VM 370

• MULTICS (GE 645)

• Alto (Xerox PARC)

• Pilot (Xerox STAR)

• CP/M

• MACH

• Apollo DOMAIN

• Unix (System V & BSD)

• Apple Mac (v.1 – v.9)

• MS-DOS

• Windows NT, 2000, XP

• various embedded systems

• …


Other

• Two seminal contributions to computer science

• Duality hypothesis for operating system structures (with Roger Needham)

• First realization of opaque types in type-safe programming languages (with Ed Satterthwaite)

• 21 US patents issued• Computer architecture• Software reliability• Networks• Computer graphics & volume rendering


Outline for Today


• Introductions







Class Discussion

What is an Operating System?

(Laptops closed, please!)


What is an Operating System?

• Characteristics– Large, complex set of

programs

– Long-lived, evolutionary

– Worked on by many people over many years

• Functions– Creates abstractions

– Multiplexes concurrent activities

– Manages resources

– Mediates access to hardware devices

– Provides a variety of services to users and applications

– …


Definition – Abstraction

• The distillation of a complex mechanism into a simple, conceptual model

• User of abstraction does not need to worry about details

• Implementer of abstraction does not need to worry about how user will use it (within limits)


What is an operating system? (cont’d)

• Abstractions:–– Processes, threads, and

concurrent computation

– Virtual memory & manages memory

– File system. Persistent storage of information

– Sockets and connections for network communication

• Controls I/O & peripherals

• Implements security and accessibility

• Definition — Same as judicial definition of pornography

• “I cannot define it, but I sure can recognize one when I see it!”


What is an Operating System

Hardware Interfaces – Registers, etc.

OS Kernel

Prog. Tools Services UI/Shell

XYZ Office Media Player Business Appl.

CPU I/O Controllers

Traditional

OS

Practical

OS


Computer System Organization


Operating System Organization

Kernel

System Libraries (user space)

Utilities, tools, other stuff


Operating System Organization (continued)

Kernel

System Libraries (user space)

Utilities, tools, other stuff

Drivers & modules File Systems


Major OS Issues

• structure: how is the OS organized?• 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 happens if something goes wrong – hardware or software• extensibility: can we add new features?• communication: how do programs exchange information• concurrency: how are parallel activities created and controlled?• scale: what happens as demands or resources increase?• persistence: how do you make data last longer than program executions?• distribution: how do multiple computers interact with each other?• accounting: how do we keep track of resource usage, and charge for it?


Operating Systems

• Large, complex programs• Typically

– Long-lived– Frequently extended and updated– Worked on by many developers– Used and, maybe abused by a variety of users with

varying expertise and expectations

• Essential to create an acceptable computing environment to create and execute other programs that achieve business or personal goals


Kinds of operating systems

• Stand-alone machines – no OS• Simple batch monitors• Concurrent I/O and programs• Time-sharing, multiple users, interactive• Servers, non-stop systems, transaction processing• PC’s, workstations• Multiple processor systems• Real-time systems• Embedded systems


Kinds of operating systems (1)

• Stand-alone machines – no OS– Manually scheduled

“jobs,” reset between jobs

– Early business computers

• E.g., IBM 1401/1460

– Early mini-computers• E.g., PDP1, PDP5,

PDP8, etc.

• Simple batch monitors– Simple “monitor

routine” switches between jobs

– Input loaded onto tape or other media off-line

– Output to tape is punched and/or printed off-line

– Typical university computing centers

• IBM 7090, Univac, etc.



• Concurrent I/O and programs– SPOOL-ing (Simultaneous Peripheral Operation On

Line)• Allows direct input & output

– Multiple programs resident in memory at once• Keeps processor busy

– On-line file storage– Some support for terminals, telecommunications

– Early business computers• E.g., IBM 7070, IBM 360 & 370

– Scientific computing• E.g., Control Data 6600, IBM 360/91



• Time-sharing, multiple users, interactive– Many concurrent users “logged on”– Interactive editing and computing– Self submission of batch jobs– Protection among users, protection among jobs– Fair allocation of resources

– All university computing centers since about 1970• E.g., MULTICS, IBM 360/67, DEC PDP-10, PDP-20

– Advanced minicomputers• DEC, Data General, Prime, etc.• Unix



• Servers, non-stop systems, transaction processing– Banking, airline reservation

– Online databases

– Many very short “transactions”

– Tandem, Stratus, Sequoia

– Unix, Linux, Solaris, HP-UX

– Windows Server 2000, 2003

– Oracle, SAP (?)



• PC’s, workstations– CP/M, DOS, MS-DOS

– Apollo Domain

– Unix, Solaris, HP-UX

– Mac OS

– Windows 95, 98, Me

– Windows 2000, XP

– Linux

• Multiple processor systems– Beowulf clusters

– Unix, Solaris, HP-UX, Linux server systems



• Real-time systems– SAGE (North

American air defense)

– Process control (steel mills, refineries, etc.)

– Large and small; computers you never heard of

– VxWorks, etc.

• Embedded systems– Auto ignition

– Cell phone, PDA

– Appliances

– …


Break


Outline for Today


• Introductions







Outline for Today


• Introductions







Outline for Today


• Introductions






Documents

CS-502 Operating Systems Fall 2007