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Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
Chapter 12
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Chapter 12

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Transcript

  • 1. Operating System Design Chapter 12 12.1 The nature of the design problem 12.2 Interface design 12.3 Implementation 12.4 Performance 12.5 Project management 12.6 Prends in operating system design
  • 2. Paradigms (1)
    • Algorithmic code
  • 3. Paradigms (2)
    • Event-driven code
  • 4. Implementation
    • One possible design for a modern layered operating system
    Layer
  • 5. Naming
    • Directories are used to map external names onto internal names
  • 6. Static Versus Dynamic Structures
    • Code for searching the process table for a given PID.
    Searching a static table for a pid
  • 7. Hiding the Hardware (1)
    • CPU-dependent conditional compilation
  • 8. Hiding the Hardware (2)
    • Word-length dependent conditional compilation
  • 9. Space-Time Trade-offs (1)
    • A procedure for counting bits in a byte
    (a) A procedure to count the 1 bits in a byte
  • 10. Space-Time Trade-offs (2)
    • A macro to count the bits
    • A macro to access bit count in a table
    (b) Macro to count the bytes (c) Macro to look up the count
  • 11. Space-Time Trade-offs (3)
    • (a) Part of an uncompressed image with 24 bits per pixel
    • (b) Same part compressed with GIF, 8 bits per pixel
    • (c) The color palate
  • 12. Caching
    • Part of an i-node cache
  • 13. Software team Structure
    • Mills’ proposal for populating a 10-person chief programmer team
  • 14. The Role of Experience (1)
    • Traditional software design progresses in stages
  • 15. The Role of Experience (2)
    • Alternative design produces a working system
      • that does nothing starting on day 1

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