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PART II OPERATING SYSTEMS

Ştefan Stăncescu. PART II OPERATING SYSTEMS. LECTURE 8 SO TAXONOMY. TAXONOMY OS. The operating system

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PART II OPERATING SYSTEMS

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  1. Ştefan Stăncescu PART IIOPERATING SYSTEMS LECTURE 8 SO TAXONOMY

  2. TAXONOMY OS • The operating system • on a real H/W machine are a compact package of system programs which manages the H/W i.e.: CPU, MEM, I/O, EXT MEM use local H/W system for running local programs communicates, stores, processes (in cloud, for distributed applications) providing an unified management environment • on different machines

  3. SO TAXONOMY • The operating system creates a local VM • efficient standardized friendly (or known interface easy to learn) • adaptable to different tasks • VM hide the real machine with complicate structure complicate handling

  4. SO TAXONOMY • OS classification after resource allocation to processes • - all resources fully allocated only to a process • (batch - batch processing) • - distributed resource allocation multiple processes (PC) • OS classification after response time to the run • - real time RTOS - with guaranteed response time to each process (processes are important) • - without time constraints - optimal loading of computing resources (resources are important)

  5. SO TAXONOMY • OS classification after process management • single process (dedicated system - embedded) embedded application is a process hosted by the unique OS process dedicated to it • cooperative management of processes running process cooperates in management • preemptive management OS contains a supervisor which • regulate run or • abort process run

  6. SO TAXONOMY • OS classification after executable SO structure- CompactSO with a single executable file all resources simultaneously available- Hierarchical (multilayered) SO with a • module architecture - levels of services provided by resources => to the user • each level is an abstract stage adaptation • H/W resource <=> system software levels <=> the user • The operator (user) and user processes • Operator-process communication and I/O management • Memory and disc (files) management • UC process allocation and multiprogramming

  7. SO TAXONOMY • OS classification after OS executable structure (cont)kernel centered SO • kernel provides reliable communication between server services and user calls • I/O separated by drivers OS versions not necessarily involve • kernel stability, safety, versatility • client-server –with host kernel (supervisor) and server resource oriented and client modules (protected) client call server services by message passing RPC • (distributed systems)

  8. SO TAXONOMY • OS classification after OS executable structure (cont) • virtual machines VM • the kernel covers (hide) the real (diverse H/W) machine each real machine converted in std. VM • with special nest VM kernels over same real machine • you can install multiple virtual machines (VM) • each with its own resource management system (OS) installed on the same core (HAL) • OS with each process with separate VM • runs in separate VM environment • nest VM kernel makes interprocess communication

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