Operating Systems 2230 Lecture 1: Introduction to Operating Systems
... System calls: allow constrained access to the interior of the running operating system (as a program). Protection: keep processes from interfering with each other, their data, and “the system”, whilst permitting sharing when requested. Communication: allow users and their programs to communication w ...
... System calls: allow constrained access to the interior of the running operating system (as a program). Protection: keep processes from interfering with each other, their data, and “the system”, whilst permitting sharing when requested. Communication: allow users and their programs to communication w ...
ships with the operating system
... temporarily Faster storage (cache) checked first to determine if ...
... temporarily Faster storage (cache) checked first to determine if ...
Syllabus
... peripherals, cabinets, and power supplies. Another reason is that, they increase reliability. - If functions can be distributed properly among several processors, then the failure of one processor will not halt the system, but rather will only slow it down. ...
... peripherals, cabinets, and power supplies. Another reason is that, they increase reliability. - If functions can be distributed properly among several processors, then the failure of one processor will not halt the system, but rather will only slow it down. ...
ppt - Computer Science
... "Because all applications must share the core abstractions, changes to core abstractions occur rarely, if ever. This is perhaps why few good ideas from the last decade of operating systems research have been adopted into widespread use. What operating systems support scheduler activations [3], multi ...
... "Because all applications must share the core abstractions, changes to core abstractions occur rarely, if ever. This is perhaps why few good ideas from the last decade of operating systems research have been adopted into widespread use. What operating systems support scheduler activations [3], multi ...
Input and Output of a processor
... memory and operating systems Giving Commands to i/o devices Basically two techniques are used to address the devices. 1.Memory-mapped I/O : An i/o scheme in which portions of address space are assigned to i/o devices. Ex : Simple printer has 2 i/o device registers. a. Status register : It contains d ...
... memory and operating systems Giving Commands to i/o devices Basically two techniques are used to address the devices. 1.Memory-mapped I/O : An i/o scheme in which portions of address space are assigned to i/o devices. Ex : Simple printer has 2 i/o device registers. a. Status register : It contains d ...
RAID meets the Web: Grass-Roots Content Distribution
... • For a uniformly partitioned space with n nodes and d dimensions – per node, number of neighbors is 2d – average routing path is (dn1/d)/4 hops – simulations show that the above results hold in practice ...
... • For a uniformly partitioned space with n nodes and d dimensions – per node, number of neighbors is 2d – average routing path is (dn1/d)/4 hops – simulations show that the above results hold in practice ...
1.operating systems overview
... parameters: sector address, number of sectors for each track, ecc… state and error conditions ...
... parameters: sector address, number of sectors for each track, ecc… state and error conditions ...
Grid agent data-flow execution
... be used together to perform arbitrary computing tasks. This goal can be interpreted in a number of ways, and the functionality can be implemented at a number of levels, with the onus for the “Gridification” being implemented somewhere between the operating system and the end application. An importan ...
... be used together to perform arbitrary computing tasks. This goal can be interpreted in a number of ways, and the functionality can be implemented at a number of levels, with the onus for the “Gridification” being implemented somewhere between the operating system and the end application. An importan ...
ppt - CSE Home
... • sharing: how are resources shared across users? • naming: how are resources named (by users or programs)? • security: how is the integrity of the OS and its resources ensured? • protection: how is one user/program protected from another? • performance: how do we make it all go fast? • reliability: ...
... • sharing: how are resources shared across users? • naming: how are resources named (by users or programs)? • security: how is the integrity of the OS and its resources ensured? • protection: how is one user/program protected from another? • performance: how do we make it all go fast? • reliability: ...
ppt
... concurrently, resources must be allocated to each of them • Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code – Accounting - To keep track of which users use how ...
... concurrently, resources must be allocated to each of them • Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code – Accounting - To keep track of which users use how ...
choices
... systems) – The distributed file system extension of Choices is close to the mechanism used in MMLite (proxy) – MMLite focuses on support for transparently replacing components in use ...
... systems) – The distributed file system extension of Choices is close to the mechanism used in MMLite (proxy) – MMLite focuses on support for transparently replacing components in use ...
history
... – hardware relocation base and limit registers » read/write/execute protected access ...
... – hardware relocation base and limit registers » read/write/execute protected access ...
08_Operating System Support
... Memory Management • Uni-program —Memory split into two —One for Operating System —One for currently executing program ...
... Memory Management • Uni-program —Memory split into two —One for Operating System —One for currently executing program ...
Slide 1
... Layering = vertical organization of services Tiered Architecture = horizontal splitting of services ...
... Layering = vertical organization of services Tiered Architecture = horizontal splitting of services ...
ppt - Dave Reed
... Distributed operating systems (cont.) when a user want to access/process remote data, can either do data migration: transfer the required data to the user's machine if any modifications are made, must transfer changes back when done (transfers can be done as entire files, or smaller blocks) com ...
... Distributed operating systems (cont.) when a user want to access/process remote data, can either do data migration: transfer the required data to the user's machine if any modifications are made, must transfer changes back when done (transfers can be done as entire files, or smaller blocks) com ...
Shin Liu 2/26/2015 Chapter 4 Power Point Answers and Questions 1
... Desktop operating system are four individual systems; Windows, Mac OS, UNIX, and LINUX. Windows, Mac OS, Linux and Chrome OS are all similar because they desktop operating systems, but from different companies. “Windows” is the most popular microcomputer operating system compared to the other operat ...
... Desktop operating system are four individual systems; Windows, Mac OS, UNIX, and LINUX. Windows, Mac OS, Linux and Chrome OS are all similar because they desktop operating systems, but from different companies. “Windows” is the most popular microcomputer operating system compared to the other operat ...
I. Introduction, system calls, dual mode
... Systems generally first distinguish among users, to determine who can do what – User identities (user IDs, security IDs) include name and associated number, one per user – User ID then associated with all files, processes of that user to determine access control ...
... Systems generally first distinguish among users, to determine who can do what – User identities (user IDs, security IDs) include name and associated number, one per user – User ID then associated with all files, processes of that user to determine access control ...
Disco: Running Commodity Operating Systems on Scalable
... Virtual machine is assigned resources by Disco which manages a pool of processing elements/memory resources ...
... Virtual machine is assigned resources by Disco which manages a pool of processing elements/memory resources ...
ICOM 4015 - Advanced Programming
... The shell is not the kernel The shell is an ordinary user program It operates by creating processes that in turn do system calls or run programs It is the equivalent of COMMAND.COM in MS/DOS Shell programming is possible and is often done in OS utilities Extensions of shell programming include: PER ...
... The shell is not the kernel The shell is an ordinary user program It operates by creating processes that in turn do system calls or run programs It is the equivalent of COMMAND.COM in MS/DOS Shell programming is possible and is often done in OS utilities Extensions of shell programming include: PER ...
Operating System
... Protection refers to a mechanism for controlling access by programs, processes, or users to both system and user resources. The protection mechanism must: – distinguish between authorized and unauthorized usage. – specify the controls to be imposed. – provide a means of enforcement. ...
... Protection refers to a mechanism for controlling access by programs, processes, or users to both system and user resources. The protection mechanism must: – distinguish between authorized and unauthorized usage. – specify the controls to be imposed. – provide a means of enforcement. ...
Chapter 1 Powerpoint
... Computer programmers began to write programs to be used by people who did not know how to program ...
... Computer programmers began to write programs to be used by people who did not know how to program ...
Distributed operating system
A distributed operating system is a software over a collection of independent, networked, communicating, and physically separate computational nodes. Each individual node holds a specific software subset of the global aggregate operating system. Each subset is a composite of two distinct service provisioners. The first is a ubiquitous minimal kernel, or microkernel, that directly controls that node’s hardware. Second is a higher-level collection of system management components that coordinate the node's individual and collaborative activities. These components abstract microkernel functions and support user applications.The microkernel and the management components collection work together. They support the system’s goal of integrating multiple resources and processing functionality into an efficient and stable system. This seamless integration of individual nodes into a global system is referred to as transparency, or single system image; describing the illusion provided to users of the global system’s appearance as a single computational entity.