Introduction to Operating Systems
... • Processes & threads • Multiplexing of processor(s) to create the illusion of many of them ...
... • Processes & threads • Multiplexing of processor(s) to create the illusion of many of them ...
What is an Operating System?
... After I/O starts, control returns to user program without waiting for I/O completion System call – request to the operating system to allow user to wait for I/O completion Device-status table contains entry for each I/O device indicating its type, address, and state Operating system indexes ...
... After I/O starts, control returns to user program without waiting for I/O completion System call – request to the operating system to allow user to wait for I/O completion Device-status table contains entry for each I/O device indicating its type, address, and state Operating system indexes ...
204341 Operating Systems
... Ex. Division by zero, request for operating system service from a user program Other process problems include infinite loop, processes modifying each other or the operating system Dual-mode operation allows OS to protect itself and other system components Need at least 2 separate modes of oper ...
... Ex. Division by zero, request for operating system service from a user program Other process problems include infinite loop, processes modifying each other or the operating system Dual-mode operation allows OS to protect itself and other system components Need at least 2 separate modes of oper ...
Operating Systems
... • Central to the design of modern Operating Systems is managing multiple processes – Multiprogramming – Multiprocessing – Distributed Processing ...
... • Central to the design of modern Operating Systems is managing multiple processes – Multiprogramming – Multiprocessing – Distributed Processing ...
OS-process-lee
... Example of System State: Intel Core Duo Note the registers that are required to record the “state” of the executing process State is swapped on a ...
... Example of System State: Intel Core Duo Note the registers that are required to record the “state” of the executing process State is swapped on a ...
What is a Device Driver?
... The kernel-device interface • How does the O/S manage the huge range of possible I/O devices? • Clearly, we don’t want to rewrite the kernel every time we add a new device. • We therefore need to impose a standard interface protocol on devices. ...
... The kernel-device interface • How does the O/S manage the huge range of possible I/O devices? • Clearly, we don’t want to rewrite the kernel every time we add a new device. • We therefore need to impose a standard interface protocol on devices. ...
CN-II_T2_SOLUTION
... – In centralized routing protocols, the routing decision is made at a central node. – In distributed routing protocols, the routing decision is made by all the network nodes. – Routing protocols in most efficiently designed ad-hoc networks are distributed to increase the reliability of the network. ...
... – In centralized routing protocols, the routing decision is made at a central node. – In distributed routing protocols, the routing decision is made by all the network nodes. – Routing protocols in most efficiently designed ad-hoc networks are distributed to increase the reliability of the network. ...
What is an Operating System?
... I/O devices and the CPU can execute concurrently Each device controller is in charge of a particular device type Each device controller has a local buffer CPU moves data from/to main memory to/from local buffers ...
... I/O devices and the CPU can execute concurrently Each device controller is in charge of a particular device type Each device controller has a local buffer CPU moves data from/to main memory to/from local buffers ...
Slide
... Message slots - A number of fixed-length message slots continuously circulate in the system (usually a ring structure) Since a slot can contain only fixed-sized messages, a single logical message may have to be broken down into a number of smaller packets, each of which is sent in a separate slo ...
... Message slots - A number of fixed-length message slots continuously circulate in the system (usually a ring structure) Since a slot can contain only fixed-sized messages, a single logical message may have to be broken down into a number of smaller packets, each of which is sent in a separate slo ...
Xiu Chen - PeerToPeerNetworks_CathyChen
... In structured networks the overlay topology is tightly controlled and files (or pointers to them) are placed at precisely specified locations. These systems essentially provide a mapping between content (e.g. file identifier) and location (e.g. node address), in the form of a distributed routing tab ...
... In structured networks the overlay topology is tightly controlled and files (or pointers to them) are placed at precisely specified locations. These systems essentially provide a mapping between content (e.g. file identifier) and location (e.g. node address), in the form of a distributed routing tab ...
OS 20 I/O Management
... smart controllers, polling Use DMA Balance CPU, memory, bus, and I/O performance for highest throughput ...
... smart controllers, polling Use DMA Balance CPU, memory, bus, and I/O performance for highest throughput ...
ppt - SERC
... Shared variables, shared memory; other variables are private to a process Special OS support for program to specify objects that are to be in shared regions of address space Posix shared memory – shmget, shmat ...
... Shared variables, shared memory; other variables are private to a process Special OS support for program to specify objects that are to be in shared regions of address space Posix shared memory – shmget, shmat ...
What is an Operating System?
... 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) ...
... 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) ...
Understanding Computers, 10/e, Chapter 6
... Recovery utilities are designed to help you recover from a major computer problem, such as rolling back your hard drive to an earlier state if it quits working after you install a new piece of hardware or software. Understanding Computers ...
... Recovery utilities are designed to help you recover from a major computer problem, such as rolling back your hard drive to an earlier state if it quits working after you install a new piece of hardware or software. Understanding Computers ...
CS 519 Operating Systems Theory Spring 1998
... network of computers: “share-nothing” -- cheap communication through message-passing: difficult to program challenge: build efficient shared memory abstraction in ...
... network of computers: “share-nothing” -- cheap communication through message-passing: difficult to program challenge: build efficient shared memory abstraction in ...
Implementation of Log Based File Systems on Open Source
... components and software components, have similar sets of advantages and disadvantages One area of research is the tradeoffs associated with particular types of file systems. The file system is a software component that directly works with the hardware of the computer; it determines how and where fil ...
... components and software components, have similar sets of advantages and disadvantages One area of research is the tradeoffs associated with particular types of file systems. The file system is a software component that directly works with the hardware of the computer; it determines how and where fil ...
Presentation - Computer Science
... S. Madden, R. Szewczyk, M.J. Franklin, and D. Culler, Supporting Aggregate Queries Over AdHoc Wireless Sensor Networks, Mobile Computing Systems and Applications, June 2002 S. Ganeriwal, R. Kumar, and M. B. Srivastava, Timing-Sync Protocol for Sensor Networks, Proceedings of ACM SenSys’03, November ...
... S. Madden, R. Szewczyk, M.J. Franklin, and D. Culler, Supporting Aggregate Queries Over AdHoc Wireless Sensor Networks, Mobile Computing Systems and Applications, June 2002 S. Ganeriwal, R. Kumar, and M. B. Srivastava, Timing-Sync Protocol for Sensor Networks, Proceedings of ACM SenSys’03, November ...
Comp 204: Computer Systems and Their Implementation Dr. Katie
... • In this period there has been a significant shift from environments where standard interaction with computers was “multiple access’’ to a single very expensive, “large” facility (hence success of IBM, DEC, Burroughs, ICL) to the, now, standard usage of laptops, netbooks, and singleuser personal en ...
... • In this period there has been a significant shift from environments where standard interaction with computers was “multiple access’’ to a single very expensive, “large” facility (hence success of IBM, DEC, Burroughs, ICL) to the, now, standard usage of laptops, netbooks, and singleuser personal en ...
Slide 1
... Error control is an important issue in any radio link. There are two important modes of error control: Forward Error Correction (FEC) – There is a direct tradeoff between the overhead added to the code and the number of errors that can be corrected. The number of bits in the code word impacts the ...
... Error control is an important issue in any radio link. There are two important modes of error control: Forward Error Correction (FEC) – There is a direct tradeoff between the overhead added to the code and the number of errors that can be corrected. The number of bits in the code word impacts the ...
Processes
... – Uses object-oriented approach – Each core component is separate – Each talks to the others over known interfaces – Each is loadable as needed within the kernel ...
... – Uses object-oriented approach – Each core component is separate – Each talks to the others over known interfaces – Each is loadable as needed within the kernel ...
system programs
... • The interrupt vector is an array of locations that hold the addresses of these routines, usually held in low memory. ...
... • The interrupt vector is an array of locations that hold the addresses of these routines, usually held in low memory. ...
Document
... We categorized the interference-aware multicasting problem as a graph problem of finding a weakly induced subgraph of minimum degree. We introduced a new model of interference. We presented an efficient greedy-based heuristic algorithm. The simulation results provide substantial evidence of the supe ...
... We categorized the interference-aware multicasting problem as a graph problem of finding a weakly induced subgraph of minimum degree. We introduced a new model of interference. We presented an efficient greedy-based heuristic algorithm. The simulation results provide substantial evidence of the supe ...
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.