Operating System: Chapter 12 - Operating System Design includes Paradigms, Implementation, Naming, Static Versus Dynamic Structures, Hiding the Hardware, Space-Time Trade-offs, Software team Structure, The Role of Experience. | Operating System Design Chapter 12 The nature of the design problem Interface design Implementation Performance Project management Prends in operating system design Paradigms (1) Algorithmic code Paradigms (2) Event-driven code Implementation One possible design for a modern layered operating system Layer Naming Directories are used to map external names onto internal names Static Versus Dynamic Structures Code for searching the process table for a given PID. Searching a static table for a pid Hiding the Hardware (1) CPU-dependent conditional compilation Hiding the Hardware (2) Word-length dependent conditional compilation Space-Time Trade-offs (1) A procedure for counting bits in a byte (a) A procedure to count the 1 bits in a byte 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 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 Caching Part of an i-node cache Software team Structure Mills’ proposal for populating a 10-person chief programmer team The Role of Experience (1) Traditional software design progresses in stages The Role of Experience (2) Alternative design produces a working system that does nothing starting on day 1 | Operating System Design Chapter 12 The nature of the design problem Interface design Implementation Performance Project management Prends in operating system design Paradigms (1) Algorithmic code Paradigms (2) Event-driven code Implementation One possible design for a modern layered operating system Layer Naming Directories are used to map external names onto internal names Static Versus Dynamic Structures Code for searching the process table for a given PID. Searching a static table for a pid Hiding the Hardware (1) CPU-dependent conditional compilation Hiding the Hardware (2) Word-length dependent conditional compilation Space-Time Trade-offs (1) A procedure for counting bits in a byte (a) A procedure to count the 1 bits in a byte 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 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 Caching Part of an i-node cache Software team Structure Mills’ proposal for populating a 10-person chief programmer team The Role of Experience (1) Traditional software design progresses in stages The Role of Experience (2) Alternative design produces a working system that does nothing starting on day 1
