CS 423 – Operating Systems Design
Lecture 1 - Introduction Klara Nahrstedt Fall 2011 CS 423 - Fall 2011
Overview Course information (personnel, policy, schedule, misc.) What is OS? What does it do? History of OS Summary
CS 423 - Fall 2011
Instructor
Klara Nahrstedt
PhD University of Pennsylvania in 1995 Research:
Multimedia distributed systems (overlay multicast, peer-to-peer systems, service composition), Multimedia operating systems (soft-real-time scheduling, caching), Multimedia networking (routing, QoS management, pricing, security), Multimedia applications (multi-camera tele-immersive systems) Mobile Peer-to-Peer Systems – Content Distribution Resource Management in Wireless 802.11 Networks Power-aware OS in mobile devices Mobility Patterns in Mobile Learning Communities
CS 423 - Fall 2011
Overview
Office Assistants: Lynette Lubben (
[email protected]) for Klara Nahrstedt
Teaching Assistants: Raoul Rivas (
[email protected]) Keun Soo Yim (
[email protected]) (Online TA) Class Website http://www.cs.illinois.edu/class/fa11/cs423/ Newsgroup: uiuc.class.cs423 and uiuc.class.cs423.announce
Two newsgroups – one for discussion on machine problems, one for announcements CS 423 - Fall 2011
Required Readings for cs423
Required Textbook: Modern
Operating Systems, Andrew S. Tanenbaum, Prentice Hall, third edition, 2008
Recommended Textbooks: Linux
Kernel Development, Robert Love, Safari Online Book, 2010, 3rd edition. Linux Device Drivers, Corbet, Rubini, Kroah-Hartman, O’REILLY, 2005, 3rd edition. Pro Android 2, Hashimi, Komatineni, MacLean, Apress, 2010. But mostly online resources CS 423 - Fall 2011
Course Prerequisites
CS 241 – MUST (or similar course) There
will be a test similar to exams of cs241 (takehome exam – not graded – it is for your own evaluation)
If you can finish more than 80% of the exam, you should be fine in the class If you cannot finish the exam with 70% and lower, then it means that you should consider sitting in cs241 or taking it first
Take-home
exam will be posted on 8/26 Solutions to take-home exam will be posted on 9/1 CS 423 - Fall 2011
Facilities and Office Hours
Laboratory Facilities CSIL-
linux and windows machines, 216 SC, Starting October 14, we will start leasing Android phones for MP3 and MP4 assignments.
Nexus-S and Droid phones
Office hours: available in web page For online students: will have collaborative tool ‘elluminate’ - will be available for online TA office hours Otherwise use with Instructor/TAs to communicate we
Skype, Email, Chat – text messaging CS 423 - Fall 2011
Online Students Recording links sent by email to online students There will be link from class website to the recording server for all students (protected by password after two weeks)
CS 423 - Fall 2011
About this course… Principles
System concepts OS design Algorithms Policies Rationale Practice
Goals
Understand OS decisions Basis for future learning Get hands dirty Linux
and/or Android
CS 423 - Fall 2011
Expect (Some) Pain Fast pace Hard material 4 MPs (programming) 2 Homework 1 Midterm and 1 Final (Comprehensive) Exam But…. Students survived past cs423! CS 423 - Fall 2011
Source: http://en.wikipedia.org/wiki/Ben_Bernanke
Grading
Final exam: 35% Mid-exam: 20% 2 Homework: 10% 4 MPs: 35%
1st MP – not graded
but absolutely essential to do – practice to work with the Linux
MP – 11% - major Linux scheduling problem 3rd MP – 11% - resource management problem (power, file system, memory …) 2nd
4th
Two options: Linux or Android
MP – 13% - distributed load management Two options: Linux or Android CS 423 - Fall 2011
Grading policy Gradebook system: http://compass.uiuc.edu Late policy for MPs and Homework Assignments
No
Late Policy, but there will be 3 Bonus Days (can’t take all three bonus days for one MP!)
It is your responsibility! Check
announcements in lectures, newsgroups, or web pages
MPs will be done in Groups of 2-3 students MPs done on vmware server
CS 423 - Fall 2011
Group Setup
Setup Groups between 8/22 and 8/24
By evening of 8/24, you should setup groups on compass.illinois.edu (under cs423 Fall 2011 class) by filling out the form under “MP Sign up” If there are any issues, email to the TA (Raoul Rivas
[email protected]) Specify name of the group members and netid of group members
David Andersen (system admin) will setup accounts on the vmware server. Between 8/27 and 29 the TA will inform each group their login and password to start to work on the vmware server The instructions about working on the vmware server will be also posted on class web and compass. CS 423 - Fall 2011
Re-grading policy Students have 1 week (after the grade for a Homework/MP/exam is released into compass gradebook) to request for regrading Re-grading requests need to be in writing to the TAs After the re-grading period, no re-grading request will be granted for this Homework/MP/exam.
CS 423 - Fall 2011
Cheating Policy Academic integrity https://wiki.engr.illinois.edu/display/undergradProg/H onor+Code Your homework and exams must be your own - we have a zero tolerance policy towards cheating of any kind.
FIRST OFFENSE – 0 points on any homework, exam, MP, SECOND OFFENSE - F - failing grade in the course.
Both the cheater and the student who aided the cheater will be held responsible for the cheating Machine problems will be graded per group, i.e., each member gets the same number of points. CS 423 - Fall 2011
Lecture Format Help you understand important and hard OS concepts Lectures do not cover everything
Not
all questions in homework or exams are from lectures (read textbook)
Students responsibility Attend
lectures Read textbooks Homework, MP, Exam, Interviews Periodically check web page Read/utilize newsgroup CS 423 - Fall 2011
MPs (Deadlines) MP1, 9/9/2011 (recommended Proc File, Synchronization, warm up – not graded) to prepare working within Linux kernel
MP2, Friday, 9/30 - deadline Monday 10/3 - interviews
Kernel Process Management/ Scheduling
MP3, Friday, 11/4 – deadline Monday 11/7 - interviews
Resource Management (Android or Linux)
MP4, Friday, 12/2 – deadline Monday 12/5 – interviews
Power/Time-sensitive Distributed Load balancing - more of an open ended assignment - Competition for students who pick Android for the final MP4 CS 423 - Fall 2011
Homework & Exams 10/3-10/10, 5pm
HW1
10/12, Monday, 10-10:50am
Midterm Exam (Inclass) HW2
11/28-12/7, 5pm
12/15, Thursday, 8-11am Room: TBD
Final Exam (Comprehen sive) CS 423 - Fall 2011
• Announcement in web page/newsgroup/compass • No makeup homework • No makeup exams unless with documented medical emergency
¼ Unit Project: graduate students
Final grade is decided upon ¾ unit performance ¼ unit project: pass or fail Individual or group of two Choices Implementation
project, Animation project, Survey
Proposal due: 9/16, Friday, 5pm Write:
½ - 1 page of proposal in ascii or pdf format Specify: (a) scope of the problem, (b) problem description, (c) deliverables, (d) timelines.
Email to
[email protected] Details
in web page CS 423 - Fall 2011
What Is an OS? “Code” that:
Sits between programs & hardware Sits between different programs Sits betweens different users
But what does it do? to provide an orderly and controlled allocation of the processors, memories and I/O devices among the various programs competing for them
CS 423 - Fall 2011
What Is an OS? Resources Allocation Protection Reclamation Virtualization
Services Abstraction Simplification Convenience Standardization
Makes computers simpler CS 423 - Fall 2011
What Is an OS? Resources Allocation Protection Reclamation Virtualization
Finite resources Competing demands Examples: CPU Memory Disk Network CS 423 - Fall 2011
What Is an OS? Resources Allocation Protection Reclamation Virtualization
You can’t hurt me I can’t hurt you
Implies some degree of safety & security
CS 423 - Fall 2011
What Is an OS? Resources Allocation Protection Reclamation Virtualization
The OS gives The OS takes away Voluntary at run time Implied at termination Involuntary Cooperative
CS 423 - Fall 2011
What Is an OS? Resources Allocation Protection Reclamation Virtualization
illusion of infinite, private resources
Memory versus disk Timeshared CPU
CS 423 - Fall 2011
History of Operating Systems (1)
First generation 1945 – 1955 vacuum
tubes, plug boards (no OS)
Second generation 1955 – 1965 transistors,
Third generation 1965 – 1980 ICs
batch systems
and multiprogramming
Fourth generation 1980 – present –
personal computers, hand-held devices, sensors CS 423 - Fall 2011
History of Operating System (1945-55)
Early batch system bring cards to 1401 read cards to tape put tape on 7094 which does computing put tape on 1401 which prints output CS 423 - Fall 2011
History of Operating Systems (1955-65)
Structure of a typical JCL job – 2nd generation Single user Programmer/User as the operator Secure, but inefficient use of expensive resources Low CPU utilization-slow mechanical I/O devices CS 423 - Fall 2011
History of Operating Systems (1965-80)
Multiprogramming system – – –
Three jobs in memory – 3rd generation Spooling - use disk as a very large buffer for input/output devices Polling/Interrupts, Timesharing CS 423 - Fall 2011
The Operating System Zoo (1980-present)
Mainframe operating systems Server operating systems Multiprocessor operating systems Personal computer operating systems Real-time operating systems Embedded operating systems Smart card operating systems CS 423 - Fall 2011
Summary Course overview Policy and requirement What is OS? OS history
Next lecture: OS architectures/system overview CS 423 - Fall 2011
After this lecture…
Reading assignment: chapter 1.1-1.4 Browse the web site Subscribe to newsgroup Login to csil machines, compass, … Setup Groups: 8/22-8/26(fill out form on compass and submit the form) Think about what are the criteria to evaluate an OS? CS 423 - Fall 2011
