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Summary and Review

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Summary and Review Course Objectives The main objectives of the course are to introduce different concepts in operating system theory and implementation; identify ... – PowerPoint PPT presentation

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Title: Summary and Review


1
Summary and Review
2
Course Objectives
  • The main objectives of the course are to
  • introduce different concepts in operating system
    theory and implementation
  • identify software design issues for advanced
    computer systems, such as multiprocessors or
    distributed systems
  • provide exposure to classic current topics in
    operating system research through reading and
    discussing conference and journal papers
  • review and expand on complex concepts from the
    introductory operating systems course, such as
    synchronization, virtual memory, and file systems.

3
Introduce different concepts in OS theory and
implementation
  • Microkernel operating systems
  • Extensible operating systems
  • Virtual machine operating systems

4
Identify software design issues for advanced
computer systems
  • Distributed systems architectures
  • Distributed system principles/design issues
  • Naming
  • Replication and consistency
  • Fault tolerance
  • Distributed systems goals

5
Provide exposure to classic current topics in
OS research in reading and analysis of papers
  • Extensible operating systems
  • Virtual machine papers
  • Racetrack Eraser
  • Superpages
  • MapReduce Dynamo

6
Review/expand on concepts from the introductory
OS course
  • Synchronization
  • Shared memory systems
  • Distributed systems
  • File replication
  • Virtual Memory
  • Superpages
  • File Systems
  • Organization/performance
  • Distributed file systems
  • Caching and replication

7
Unification
  • When you review course material try to think
    about connections
  • Distributed system architectures as applied to
    systems we studied e.g., compare Google cluster
    architecture to traditional client-server P2P
  • Discussion of logical time/Lamport time
    stamps/vector clocks and applications of those
    techniques
  • Middleware definition and examples of services
    that could be implemented as middleware.
  • Examples what is fault tolerance, how is it
    managed in ltsome system we have studiedgt,
    define transparency and discuss techniques that
    might be used to achieve it,

8
Coverage
  • Comprehensive
  • Relatively more emphasis on untested material
  • Distributed file systems
  • MapReduce Dynamo (although we only spent a
    short time on these two systems)
  • Memory management/superpages
  • Material from previous tests
  • Less detail, but remember that much of it shows
    up again and again, so you cant ignore it (e.g.
    architectures, scalability, )
  • Mutual exclusion and other forms of
    synchronization are still important

9
New Material
  • Distributed file systems
  • Basic concepts
  • Use of caching
  • Cache consistency issues
  • Different file semantics
  • Replication/replica updates/replica consistency

10
New Material
  • Dynamo
  • Basic idea
  • P2P aspects
  • Fault tolerance
  • MapReduce
  • Basic idea
  • Responsibilities of processors
  • Fault tolerance issues

11
New Material
  • Superpages
  • the problem
  • Large superpage size versus small
  • Use multiple page sizes or just one
  • Reservation versus relocation
  • Affect of these issues on fragmentation/contiguity

12
Things to Study
  • Definitions
  • Algorithms (e.g., mutual exclusion, how to place
    an item in a P2P system, )
  • Numbered lists 4 reasons for, 3 advantages
    of, main design goals
  • Discuss and evaluate
  • Anything that can be compared/contrasted e.g.
    RaceTrack v Eraser methodology

13
Test-Taking Tips - 1
  • Base length of answer on (1) my suggestion
    brief, 25 words or less, etc. (2) number of
    points its worth, (3) amount of space on test
    paper.
  • Dont answer anything I didnt ask about, but DO
    answer the question posed e.g., for the question
    Structurally, how do microkernel operating
    systems differ from traditional

14
Test-Taking Tips - 2
  • Dont answer anything I didnt ask about, but DO
    answer the question posed e.g., for the question
    How does a microkernel architecture differ from
    the architecture of a traditional operating
    system?
  • DONT talk about advantages/disadvantages dont
    talk about the motivation behind each kind of
    system.
  • DO describe the architectures, show where they
    are different.

15
Test-Taking Tips 3
  • Budget your time
  • If you dont know the answer, come back to it
    later
  • Dont waste a lot of time on a 2-point questions
  • If you want to add extra details, dont do so
    until youre sure youve covered the basics.

16
Test-Taking tips 4
  • Be sure you read the instructions for each
    question before you begin the answer.
  • If a question has several parts (a, b, c) dont
    answer part (a) until you have read parts (b) and
    (c) otherwise, you may write things in the
    first part that youll have to repeat later.
  • If a question says Answer three out of four,
    dont waste time answering all four.
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