Introduction & Logistics
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1 CS 4410 Operating Systems Introduction & Logistics Elisavet Kozyri Summer 2011 Cornell University
2 Welcome! Today: Introduction Motivation What is an OS? Issues in OS Design Why Learn Operating Systems? Draft schedule Logistics
3 What was before OS? Early 1950: Programmable general purpose computers Programming through punched tapes One program at a time Individual effort to handle input and output Later: Run time libraries Input/Output interrupt Multi-tasking Memory allocation As a whole: They were building an OS
4 What is an Operating System? A program that manages the computer hardware. An operating system (OS) provides a virtual execution environment on top of hardware that is more convenient than the raw hardware interface. All of the code you did not write Simpler More reliable More secure More portable More efficient
5 What is an Operating System? Users Mary John Applications Web-browser Word Processor Video Game Operating System Scheduler Monitor Driver Network Driver Memory manager Disk manager Hardware CPU Memory Disk Network card Monitor
6 What do OSes do? Manage physical resources Provide virtual resources Implement mechanisms and enforce policies for the control and use of resources Mediate the interaction of mutually distrusting applications
7 Issues In OS Design Structure: how is an OS organized? Concurrency: how are parallel activities created and controlled? Sharing: how are resources shared? Naming: how are resources named by users? Protection: how are distrusting parties protected from each other? Security: how to authenticate, authorize and ensure privacy? Performance: why is it so slow?
8 More Issues Reliability: how do we deal with failures? Extensibility: how do we add new features? Communication: how do we exchange information? Scale: what happens as demands increase? Persistence: how do we make information outlast the processes that created it? Accounting: who pays the bills and how do we control resource usage?
9 Why Learn Operating Systems? Provides an understanding from the bottom up Even if few people build OSes, understanding how OSes work is crucial for building working systems Learn relevant aspects of computer organization, including concurrency, synchronization, input/output, filesystems, networking, routing, distributed systems and so forth OSes are everywhere! PCs, Servers, Mobile phones, MP3 players, Cars There are still problems to be solved Think: Why OSes are not used by critical devices? Robustness and safety is difficult to be guaranteed.
10 Why Learn Operating Systems?
11 Lectures Schedule Hardware Processes Threads CPU scheduling Synchronization Deadlocks Memory management Virtual memory Disks File systems Network Security
12 Logistics Class dates: May 23-July 1, 2011 Days/times: M-F 8:30 AM - 9:45 AM Upson Hall 111 Instructor: Elisavet Kozyril Office Hours: M-F 10:00 AM - 11:00 AM, 4132 Upson Hall ekozyri at cs.cornell.edu Webpage:
13 Logistics Prior Knowledge CS 3410, CS 3420 Programming experience Computer architecture Course Readings Operating System Concepts (8th Edition) Silberschatz, Galvin and Gagne Lectures Intensive Interactive Please attend!
14 Logistics Mini-presentation A five-minute presentation Review of the previous lecture Simple, short, preparation time < 15 min Every Friday we will arrange the presentations for next week. Who wants to present on Thursday / Friday?
15 Logistics Homework weekly assigned independent work theoretical + practical + review synchronized with the lectures Mini-test fifteen-minute in-class test related to the previous assignment easy, short, preparation time = 0 Final Exam probably at July 1 st Upson Hall 111
16 Logistics Grading from A+ to F non-curved 5% at instructor's discretion (participation, mini-presentation, etc) 10% mini-tests 40% assignments 50% final exam Remember: The target is the knowledge, not the grade! Academic Integrity
17 Activity Advantages and disadvantages of open source Operating Systems.
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