Unit 2 - NIST NACOL
... text files, or may be rigidly formatted. In general files are a sequence of bits, bytes, lines or records whose meaning is defined by its creator and user. It is a very general concept. The operating system implements the abstract concept of the file by managing mass storage device, such as tapes an ...
... text files, or may be rigidly formatted. In general files are a sequence of bits, bytes, lines or records whose meaning is defined by its creator and user. It is a very general concept. The operating system implements the abstract concept of the file by managing mass storage device, such as tapes an ...
Chapter 2 Operating Systems Concepts
... • Process management • File and I/O device management – I/O devices are treated as files (makes programs device independent) • Interprocess communication (IPC) – May be local or remote – Two models: message passing, shared memory ...
... • Process management • File and I/O device management – I/O devices are treated as files (makes programs device independent) • Interprocess communication (IPC) – May be local or remote – Two models: message passing, shared memory ...
What is an Operating System?
... • Asymmetric multiprocessing model (Cont.): - Master performs I/O and computations. - Only master may execute the O.S. - Slave can execute only user programs. - If master fails the system cannot perform I/O. - If slave fails some computations are lost but still the system can function. - More common ...
... • Asymmetric multiprocessing model (Cont.): - Master performs I/O and computations. - Only master may execute the O.S. - Slave can execute only user programs. - If master fails the system cannot perform I/O. - If slave fails some computations are lost but still the system can function. - More common ...
System - Regis University: Academic Web Server for Faculty
... buffering (storing data temporarily while it is being transferred), caching (storing parts of data in faster storage for performance), spooling (the overlapping of output of one job with input of other jobs) ▫ General device-driver interface ▫ Drivers for specific hardware devices ...
... buffering (storing data temporarily while it is being transferred), caching (storing parts of data in faster storage for performance), spooling (the overlapping of output of one job with input of other jobs) ▫ General device-driver interface ▫ Drivers for specific hardware devices ...
Thread
... Processes and threads Processes historically first abstraction of single thread of activity can run concurrently, CPU sharing if single CPU need own execution environment address space, registers, synchronization resources (semaphores) scheduling requires switching of environment ...
... Processes and threads Processes historically first abstraction of single thread of activity can run concurrently, CPU sharing if single CPU need own execution environment address space, registers, synchronization resources (semaphores) scheduling requires switching of environment ...
Cross Platform Compatibility on Mobile Operating Systems
... altering the current system in a safe method. Moreover different applications can be made to run simultaneously. It allows different services in single mobile which in turn saves money as no extra hardware is required. Smart phones now are provided with additional memory but much of it is not being ...
... altering the current system in a safe method. Moreover different applications can be made to run simultaneously. It allows different services in single mobile which in turn saves money as no extra hardware is required. Smart phones now are provided with additional memory but much of it is not being ...
Operating Systems and System Software
... Although the concept of time-sharing is very similar to that of time-slicing they are not to be confused! Time-sharing allocates a time slice to USERS that are using the same computer. Therefore each user has a small time slot in which to use the resources of the computer. These time periods are so ...
... Although the concept of time-sharing is very similar to that of time-slicing they are not to be confused! Time-sharing allocates a time slice to USERS that are using the same computer. Therefore each user has a small time slot in which to use the resources of the computer. These time periods are so ...
Brief Overview of Academic Research on P2P
... which peer has it the “directory service” problem ...
... which peer has it the “directory service” problem ...
Operating systems
... It is the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs. Operating systems, in general, control the functions of a computer and the running of application programs. They perform basic tasks, such as recognizing inpu ...
... It is the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs. Operating systems, in general, control the functions of a computer and the running of application programs. They perform basic tasks, such as recognizing inpu ...
Homework 1
... has only 2 jobs: A and B. Provide a scenario where running the jobs sequentially will provide better performance (measured by having a smaller makespan) compared to running them in parallel. If such a scenario does not exist, explain why. Otherwise, explain the particulars of jobs A and B and how it ...
... has only 2 jobs: A and B. Provide a scenario where running the jobs sequentially will provide better performance (measured by having a smaller makespan) compared to running them in parallel. If such a scenario does not exist, explain why. Otherwise, explain the particulars of jobs A and B and how it ...
Best-Effort Multimedia Networking Outline
... If user program has exception handling specified, then OS adjust the user program state so that it calls its handler Execute an RTI instruction to return to the user program If user program did not have a specified handler, then OS kills it and runs some other user program, as available Key Fact: Ef ...
... If user program has exception handling specified, then OS adjust the user program state so that it calls its handler Execute an RTI instruction to return to the user program If user program did not have a specified handler, then OS kills it and runs some other user program, as available Key Fact: Ef ...
General overview of the System
... • Permission to access a file is controlled by access permissions associated with the file. • Access permissions can be set independently to control read, write and execute permission for three classes of users : the file owner, a file group, other users. •Users may create files if directory access ...
... • Permission to access a file is controlled by access permissions associated with the file. • Access permissions can be set independently to control read, write and execute permission for three classes of users : the file owner, a file group, other users. •Users may create files if directory access ...
SELFMAN: Self management of large
... We will provide self management by combining a component model with a structured overlay network. The component model will support dynamic configuration, the ability of part of the system to reconfigure other parts at run-time, which is the key property that underlies the selfmanagement abilities. B ...
... We will provide self management by combining a component model with a structured overlay network. The component model will support dynamic configuration, the ability of part of the system to reconfigure other parts at run-time, which is the key property that underlies the selfmanagement abilities. B ...
slides
... A cylinder is the collection of all the same tracks across all the multiple disk surfaces. There is a time associated with turning heads on and off so that a different surface can be accessed. We call this overhead the headswitching time. ...
... A cylinder is the collection of all the same tracks across all the multiple disk surfaces. There is a time associated with turning heads on and off so that a different surface can be accessed. We call this overhead the headswitching time. ...
Processor Folding for Linux
... other operating systems on the machine. This process currently only happens when the processor is not being used. Consider for a moment what would happen if an operating system with three processors allocated to it uses only 20% of each processor. Much of the processing power would be wasted. A new ...
... other operating systems on the machine. This process currently only happens when the processor is not being used. Consider for a moment what would happen if an operating system with three processors allocated to it uses only 20% of each processor. Much of the processing power would be wasted. A new ...
Abstract View of System Components
... system. Many processes can run at once without performance deterioration. Most modern operating systems support SMP Asymmetric multiprocessing Each processor is assigned a specific task; master processor schedules and allocated work to slave processors. More common in extremely large syste ...
... system. Many processes can run at once without performance deterioration. Most modern operating systems support SMP Asymmetric multiprocessing Each processor is assigned a specific task; master processor schedules and allocated work to slave processors. More common in extremely large syste ...
COMPUTER HARDWARE
... Allows the user & computer to communicate. Computer responds directly to commands e.g. word processing, a computer game. Real – time System A system which responds immediately to input e.g. online booking system. Standard Grade ...
... Allows the user & computer to communicate. Computer responds directly to commands e.g. word processing, a computer game. Real – time System A system which responds immediately to input e.g. online booking system. Standard Grade ...
Operating Systems
... Operating Systems An Operating system (OS) is a set of programs containing instructions that work together to coordinate all the activities among computer hardware resources. Activities such as: starting and shutting down a computer, providing a user interface, managing programs, managing memory, ...
... Operating Systems An Operating system (OS) is a set of programs containing instructions that work together to coordinate all the activities among computer hardware resources. Activities such as: starting and shutting down a computer, providing a user interface, managing programs, managing memory, ...
Operating Systems
... An Operating system (OS) is a set of programs containing instructions that work together to coordinate all the activities among computer hardware resources. Activities such as: starting and shutting down a computer, providing a user interface, managing programs, managing memory, coordinating tasks, ...
... An Operating system (OS) is a set of programs containing instructions that work together to coordinate all the activities among computer hardware resources. Activities such as: starting and shutting down a computer, providing a user interface, managing programs, managing memory, coordinating tasks, ...
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.