Operating system deign and implementation
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The document discusses operating system design and implementation. It outlines design goals for an operating system including user goals like ease of use and reliability, and system goals which depend on the environment. Implementation is discussed, noting traditionally assembly was used but modern operating systems often use high-level languages like C and C++ due to advantages in development speed, portability and understandability, though assembly is still sometimes used for performance critical routines. Memory management and CPU scheduling are highlighted as important parts of implementation.
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Operating system deign and implementation
- 1. Operating System Deign And implementation
- 2. Design Goals First problem in designing system is to define goals and specification At highest level design affected by hardware and type of system Requirements are much harder to specify Requirements are categorized in two groups users goals and system goals User goals Convenient ,easy to learn and use ,reliable ,safe , fast System should easy to design ,create , maintain and update. (os developer) Flexible , reliable , error free and efficient
- 3. Design Goals System goals No unique solution to define system goals Depends on environment VxWorks: real time OS ,for embedded system Multiuser System: IBM mainframes
- 4. Implementation Traditionally assembly language High level language C, C++ Master Control Program (MCP)-First OS- variants of ALGOL, MULTICS Linux and Windows XP: C , Assembly Language High level language: written faster , more compact , easier to understand and debug. Improvement in compilation needs only recompilation. Easier to port MS DOS : Assembly Language –runs on intel x86 family Disadvantage : Reduced speed and increased storage requirements Small Assembly language routines Modern computers have deep pipelining and multiple functional units
- 5. Implementation Performance improvement – better DS and algorithm than assembly code Memory manager and CPU Scheduler