Operating Systems - bu people
... • Mutual exclusion – a resource is already assigned • Hold and Wait – a process which has already been granted resources can seek new ones • No preemptive condition – resources previously granted cannot be forcibly taken away • Circular wait condition – there is a circular condition of at least two ...
... • Mutual exclusion – a resource is already assigned • Hold and Wait – a process which has already been granted resources can seek new ones • No preemptive condition – resources previously granted cannot be forcibly taken away • Circular wait condition – there is a circular condition of at least two ...
Document
... On-the-fly software decisions about routing and forwarding In-network connection-splitting store-and-forward In-network on-the-fly admission control In-network content distribution ...
... On-the-fly software decisions about routing and forwarding In-network connection-splitting store-and-forward In-network on-the-fly admission control In-network content distribution ...
PPT slides - SIUE Computer Science
... “Extended machine” is a virtual computer hardware that can be manipulated directly by high-level commands ...
... “Extended machine” is a virtual computer hardware that can be manipulated directly by high-level commands ...
Chapter 6: Operating Systems: The Genie in the Computer
... leave a program disk “Booting up”(Starting) the computer: in the floppy drive. 1. The computer invokes a stripped-down version of the operating system found in ROM. (Makes the computer recognize the keyboard, floppy and the hard disk drives.) = the BIOS starts 2. Diagnostics are run on RAM and any c ...
... leave a program disk “Booting up”(Starting) the computer: in the floppy drive. 1. The computer invokes a stripped-down version of the operating system found in ROM. (Makes the computer recognize the keyboard, floppy and the hard disk drives.) = the BIOS starts 2. Diagnostics are run on RAM and any c ...
ICS 111 - University of Hawaii
... • Three general goals of an OS 1. Execute user programs 2. Make computer system convenient to use 3. Use computer hardware in an efficient manner ...
... • Three general goals of an OS 1. Execute user programs 2. Make computer system convenient to use 3. Use computer hardware in an efficient manner ...
System Software
... the computer Loaded into memory each time a computer is started When a new device is added, new device drivers must be installed Add a Device Wizard – step-by-step Windows already has many drivers within the system software ...
... the computer Loaded into memory each time a computer is started When a new device is added, new device drivers must be installed Add a Device Wizard – step-by-step Windows already has many drivers within the system software ...
IOSR Journal of Computer Engineering (IOSR-JCE)
... requests. As enterprise traffic increases, network administrators can simply plug another server into the cluster. financial transactions, database access, corporate intranets, and other key functions must run 24 hours a day, seven days a week. And networks need the ability to scale performance to h ...
... requests. As enterprise traffic increases, network administrators can simply plug another server into the cluster. financial transactions, database access, corporate intranets, and other key functions must run 24 hours a day, seven days a week. And networks need the ability to scale performance to h ...
Scheduling
... Surplus Fair Scheduling: A Proportional-Share CPU Scheduling Algorithm for Symmetric Multiprocessors Scheduler Activations: Effective Kernel Support for UserLevel Management of Parallelism", Condor- A Hunter of Idle Workstation ...
... Surplus Fair Scheduling: A Proportional-Share CPU Scheduling Algorithm for Symmetric Multiprocessors Scheduler Activations: Effective Kernel Support for UserLevel Management of Parallelism", Condor- A Hunter of Idle Workstation ...
CHAP4
... • Multiple Instruction Single Data (MISD) – a sequence of data is transmitted to a set of processors, each of which executes a different instruction sequence. Never ...
... • Multiple Instruction Single Data (MISD) – a sequence of data is transmitted to a set of processors, each of which executes a different instruction sequence. Never ...
1.5 In a multiprogramming and time
... 3.9 Why does Java provide the ability to call from a Java program native methods that are written in, say, C or C++? Provide an example where a native method is useful. Answer: Java programs are intended to be platform I/O independent. Therefore, the language does not provide access to most specific ...
... 3.9 Why does Java provide the ability to call from a Java program native methods that are written in, say, C or C++? Provide an example where a native method is useful. Answer: Java programs are intended to be platform I/O independent. Therefore, the language does not provide access to most specific ...
Macro vs Microkernels
... All pages moving between the kernel and the default memory manager must remain resident It cannot block to wait for more physical memory It cannot block to wait for the file system to allocate temporary disk storage, since the file system itself may be pageable ...
... All pages moving between the kernel and the default memory manager must remain resident It cannot block to wait for more physical memory It cannot block to wait for the file system to allocate temporary disk storage, since the file system itself may be pageable ...
DK_February_2008_Koblenz - delab-auth
... neighboring node (remote cache hit), forwards the request to the neighboring node with the largest residual energy • If the request can not be satisfied by this mediator node, then it does not forward it recursively to its own mediators, since this will be done by the routing protocol, e.g., AODV • ...
... neighboring node (remote cache hit), forwards the request to the neighboring node with the largest residual energy • If the request can not be satisfied by this mediator node, then it does not forward it recursively to its own mediators, since this will be done by the routing protocol, e.g., AODV • ...
Mr. Atif_Kamal_P2P Routing Algorithms
... detect & mange this unlikely event In a network with N participating nodes the Pastry algo will correctly route a message addressed to any GUID in O(log N) steps If GUID identifies a node which is active, message is delivered to that node otherwise delivered to a active node with closet numeric GUID ...
... detect & mange this unlikely event In a network with N participating nodes the Pastry algo will correctly route a message addressed to any GUID in O(log N) steps If GUID identifies a node which is active, message is delivered to that node otherwise delivered to a active node with closet numeric GUID ...
pdf
... • There must be a system call instruction that switches from user to kernel mode • The system call instruction usually does the following: – causes an exception, which vectors to a kernel handler – passes a parameter, saying which system routine to call – saves caller’s state (PC, SP, other register ...
... • There must be a system call instruction that switches from user to kernel mode • The system call instruction usually does the following: – causes an exception, which vectors to a kernel handler – passes a parameter, saying which system routine to call – saves caller’s state (PC, SP, other register ...
Inside and Outside the OS
... may make back-up copies for his/her own use only and not for distribution or resale. The Publisher assumes no responsibility for errors, omissions, or damages caused by the use of these programs or from the use of the ...
... may make back-up copies for his/her own use only and not for distribution or resale. The Publisher assumes no responsibility for errors, omissions, or damages caused by the use of these programs or from the use of the ...
Process Description and Control
... all access and thus separates PCBs from the other parts of the operating system. The strategy is similar to the object-orientation method, where local variables are invisible and cannot be visited directly, and public methods make up the access interface. ...
... all access and thus separates PCBs from the other parts of the operating system. The strategy is similar to the object-orientation method, where local variables are invisible and cannot be visited directly, and public methods make up the access interface. ...
Specialized Execution Environments
... OS security or bug fix update needed by a particular application need not affect OSes that are dedicated to providing hardware support. We argue that this separation of responsibilities should be encouraged and that the next step is not just to deploy of the right OS for the right task, but also to ...
... OS security or bug fix update needed by a particular application need not affect OSes that are dedicated to providing hardware support. We argue that this separation of responsibilities should be encouraged and that the next step is not just to deploy of the right OS for the right task, but also to ...
Section 10: Intro to I/O and File Systems
... • Asynchronous I/O For I/O operations, we can have the requesting process sleep until the operation is complete, or have the call return immediately and have the process continue execution and later notify the process when the operation is complete. • Memory-Mapped File A memory-mapped file is a seg ...
... • Asynchronous I/O For I/O operations, we can have the requesting process sleep until the operation is complete, or have the call return immediately and have the process continue execution and later notify the process when the operation is complete. • Memory-Mapped File A memory-mapped file is a seg ...
Questionaire
... 2. What are RAID discs? Explain the difference between some of the RAID levels. 3. Discuss the concept of mounting a file system. 4. Explain the difference between hard links and soft links. What are the advantages and disadvantages? 5. What is an inode? Which relationship exists between a file name ...
... 2. What are RAID discs? Explain the difference between some of the RAID levels. 3. Discuss the concept of mounting a file system. 4. Explain the difference between hard links and soft links. What are the advantages and disadvantages? 5. What is an inode? Which relationship exists between a file name ...
slides - Simon Fraser University
... 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 is from the device to local buffer of controller. Device controller i ...
... 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 is from the device to local buffer of controller. Device controller i ...
012117121K
... network technologies, and includes several recent products that are specifically designed for cluster computing. I/O attached shared storage systems include computers that share a common disk subsystem. Memory attached systems are less common, since the memory bus of an individual computer generally ...
... network technologies, and includes several recent products that are specifically designed for cluster computing. I/O attached shared storage systems include computers that share a common disk subsystem. Memory attached systems are less common, since the memory bus of an individual computer generally ...
TCP for Mobile and Wireless Hosts
... Continuous-time CSMA-like algorithm shown to achieve stability [Jiang-Walrand’08] Extended to discrete-time CSMA-like algorithms ...
... Continuous-time CSMA-like algorithm shown to achieve stability [Jiang-Walrand’08] Extended to discrete-time CSMA-like algorithms ...
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.