OperatingSystems_FA15_13_IO_Systems
... I/O and must not be available for normal physical memory. Copyright @ 2009 Pearson Education, Inc. ...
... I/O and must not be available for normal physical memory. Copyright @ 2009 Pearson Education, Inc. ...
Input and Output Optimization in Linux for Appropriate Resource
... of different components of the operating system (Weissel, 2002). They also found that there was a varying threshold, based off of the type of operating system and the programs being executed, for the transition into low-power modes; the threshold was only efficient, “if time for the next request is ...
... of different components of the operating system (Weissel, 2002). They also found that there was a varying threshold, based off of the type of operating system and the programs being executed, for the transition into low-power modes; the threshold was only efficient, “if time for the next request is ...
Module 3: Operating
... Resource allocation – allocating resources to multiple users or multiple jobs running at the same time Accounting – keep track of and record which users use how much and what kinds of computer resources for account billing or for accumulating usage statistics ...
... Resource allocation – allocating resources to multiple users or multiple jobs running at the same time Accounting – keep track of and record which users use how much and what kinds of computer resources for account billing or for accumulating usage statistics ...
Week-1
... CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller Device controller informs CPU that it has finished its operation by ...
... CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller Device controller informs CPU that it has finished its operation by ...
Virtualization Explained:
... virtualization is the virtual machine monitor(VMM), which handles many of the tasks essential to successful virtualization. The VMM manages multiple instances of an operating system and switches instances so that each virtual machine can access the underlying processor, memory and local disk resourc ...
... virtualization is the virtual machine monitor(VMM), which handles many of the tasks essential to successful virtualization. The VMM manages multiple instances of an operating system and switches instances so that each virtual machine can access the underlying processor, memory and local disk resourc ...
ppt
... Job run-times are known Job arrival times are not known When a new job arrives: if its run-time is shorter than the remaining time of the ...
... Job run-times are known Job arrival times are not known When a new job arrives: if its run-time is shorter than the remaining time of the ...
MIDTERM #1 - School of Computer Science
... 2. An operating system may be viewed as a resource allocator of such things as CPU time, memory space, file-storage space, I/O devices, and so on, due to the requirement that _________ . A) such things need to allocated to be useful for operating systems to work B) conflicts of resource usage must n ...
... 2. An operating system may be viewed as a resource allocator of such things as CPU time, memory space, file-storage space, I/O devices, and so on, due to the requirement that _________ . A) such things need to allocated to be useful for operating systems to work B) conflicts of resource usage must n ...
03-60-330-01 Winter 2010 - School of Computer Science
... 4. All questions are multiple choice. Circle the single response which best answers each question. 5. Place all responses on the approved Scantron marking sheet using PENCIL. 6. You are not allowed to give or receive unauthorized help with your test. Any misconduct, as outlined by the Senate bylaw 3 ...
... 4. All questions are multiple choice. Circle the single response which best answers each question. 5. Place all responses on the approved Scantron marking sheet using PENCIL. 6. You are not allowed to give or receive unauthorized help with your test. Any misconduct, as outlined by the Senate bylaw 3 ...
Interprocess Communication (IPC)
... •An application is to allow totally unrelated programs to communicate with each other. For example, a program that services requests of some sort (print files, access a database) could open the pipe for reading. Then, another process could make a request by opening the pipe and writing a command. Th ...
... •An application is to allow totally unrelated programs to communicate with each other. For example, a program that services requests of some sort (print files, access a database) could open the pipe for reading. Then, another process could make a request by opening the pipe and writing a command. Th ...
M.C.A.(Sem - V) Distributed Computing
... resources of the workstation along with its own logged-on user’s processes. This method is easy to implement, but it defeats the main idea of workstations serving as personal computers, because if remote processes are allowed to execute simultaneously with the logged on user’s own processes, the log ...
... resources of the workstation along with its own logged-on user’s processes. This method is easy to implement, but it defeats the main idea of workstations serving as personal computers, because if remote processes are allowed to execute simultaneously with the logged on user’s own processes, the log ...
QNX OS for Security
... QNX OS for Security Common Criteria certified, memory-protected, microkernel architecture for maximum reliability, unparalleled scalability, and realtime performance. Since 1980, manufacturers have relied on QNX® realtime OS technology to power mission-critical applications – everything from medical ...
... QNX OS for Security Common Criteria certified, memory-protected, microkernel architecture for maximum reliability, unparalleled scalability, and realtime performance. Since 1980, manufacturers have relied on QNX® realtime OS technology to power mission-critical applications – everything from medical ...
EECC722 - Shaaban
... pressure on various low-level resources, including the caches and the BTB. – Kernel threads also cause more conflicts in those resources, both with other kernel threads and with user threads; on the other hand, there is an positive interthread sharing effect as well. ...
... pressure on various low-level resources, including the caches and the BTB. – Kernel threads also cause more conflicts in those resources, both with other kernel threads and with user threads; on the other hand, there is an positive interthread sharing effect as well. ...
ppt
... • General purpose operating systems handling diverse set of tasks – Conventional best-effort with low response time + Ex: word processor ...
... • General purpose operating systems handling diverse set of tasks – Conventional best-effort with low response time + Ex: word processor ...
OPERATING SYSTEMS:
... •Faster storage (cache) checked first to determine if information is there • If it is, information used directly from the cache (fast) • If not, data copied to cache and used there •Cache smaller than storage being cached • Cache management important design problem • Cache size and replacement polic ...
... •Faster storage (cache) checked first to determine if information is there • If it is, information used directly from the cache (fast) • If not, data copied to cache and used there •Cache smaller than storage being cached • Cache management important design problem • Cache size and replacement polic ...
Devices and Device Controllers
... stored somewhere, and restored when the system wakes up. OR 2. The operating system needs to know about all the internal details of each hardware device and obtain all necessary information about the internal state piece-by-piece. This is why hibernation usually does not work under Linux. ...
... stored somewhere, and restored when the system wakes up. OR 2. The operating system needs to know about all the internal details of each hardware device and obtain all necessary information about the internal state piece-by-piece. This is why hibernation usually does not work under Linux. ...
H 10.1. File-System Interface
... lowercase characters in names, whereas other systems consider the two cases to be equivalent. When a file is named, it becomes independent of the process, the user, and even the system that created it. For instance, one user might create the file example.c, whereas another user might edit that file ...
... lowercase characters in names, whereas other systems consider the two cases to be equivalent. When a file is named, it becomes independent of the process, the user, and even the system that created it. For instance, one user might create the file example.c, whereas another user might edit that file ...
University of Tehran
... + Good hooks for security – Can be a limiting model – Must watch for performance problems Not widely used yet ...
... + Good hooks for security – Can be a limiting model – Must watch for performance problems Not widely used yet ...
CSC420 สัปดาห์ที่ 2
... Prevention of Circular Wait • Circular wait can be bypassed if OS prevents formation of a circle. • Havender’s solution (1968) is based on a numbering system for resources such as: printer = 1, disk = 2, tape= 3. – Forces each job to request its resources in ascending order. – Any “number one” devi ...
... Prevention of Circular Wait • Circular wait can be bypassed if OS prevents formation of a circle. • Havender’s solution (1968) is based on a numbering system for resources such as: printer = 1, disk = 2, tape= 3. – Forces each job to request its resources in ascending order. – Any “number one” devi ...
Computer Architecture Using a Thorough, Concise, Step-by
... technical advancement over the mechanical, electromechanical, or analog based machines of this time. This prototype had many limitations; it was slow, not programmable, and could not do general purpose computing. Its only purpose was to calculate linear equations. Another noticeable design character ...
... technical advancement over the mechanical, electromechanical, or analog based machines of this time. This prototype had many limitations; it was slow, not programmable, and could not do general purpose computing. Its only purpose was to calculate linear equations. Another noticeable design character ...
slides - Computer Science
... Enables wimp applications to obtain isolated I/O channels to any subset of a system’s commodity devices needed during a session Enables trusted audit and control of physical devices without stopping and restarting applications, Allows unmodified commodity OSes to have unfettered access to all hardwar ...
... Enables wimp applications to obtain isolated I/O channels to any subset of a system’s commodity devices needed during a session Enables trusted audit and control of physical devices without stopping and restarting applications, Allows unmodified commodity OSes to have unfettered access to all hardwar ...
Concurrency (January 10)
... stack for temporary data. Switching the CPU between two processes may be relatively expensive as well, since the CPU context (which consists of register values, program counter, stack counter, etc) must be saved. Context switching also requires invalidation of address translation caches. ...
... stack for temporary data. Switching the CPU between two processes may be relatively expensive as well, since the CPU context (which consists of register values, program counter, stack counter, etc) must be saved. Context switching also requires invalidation of address translation caches. ...
COS 318: Operating Systems Virtual Machine Monitors Jaswinder Pal Singh
... virtualized ones statically (Paravirtualization) l Perform Binary Translation (Full Virtualization) l Note: both basically remove problematic (nonvirtualizable) instructions from the guest OS l ...
... virtualized ones statically (Paravirtualization) l Perform Binary Translation (Full Virtualization) l Note: both basically remove problematic (nonvirtualizable) instructions from the guest OS l ...
Embedded Operating Systems Selection Guide
... centralized server. However, thin clients offer the additional advantages of a smaller footprint (offering less surface area for attacks and patching) and image lifecycle (because applications are stored on the server or PC blade, the thin client operating system does not require upgrading). ...
... centralized server. However, thin clients offer the additional advantages of a smaller footprint (offering less surface area for attacks and patching) and image lifecycle (because applications are stored on the server or PC blade, the thin client operating system does not require upgrading). ...
Java Threads
... n Linux refers to them as tasks rather than threads. n Thread creation is done through clone() system call. n Clone() allows a child task to share the address space of ...
... n Linux refers to them as tasks rather than threads. n Thread creation is done through clone() system call. n Clone() allows a child task to share the address space of ...
Threads - IFSC-USP
... n Linux refers to them as tasks rather than threads. n Thread creation is done through clone() system call. n Clone() allows a child task to share the address space of ...
... n Linux refers to them as tasks rather than threads. n Thread creation is done through clone() system call. n Clone() allows a child task to share the address space of ...