COSC A365 Chapter 1
... 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 ...
... 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 ...
ppt - CS Course Webpages
... type of semiconductor memory in which the memory is stored in the form of a charge. Each memory cell in a DRAM is made of a transistor and a capacitor. The data is stored in the capacitor. Capacitors loose charge due to leakage and hence DRAM's are volatile devices. To keep the data in the memory, t ...
... type of semiconductor memory in which the memory is stored in the form of a charge. Each memory cell in a DRAM is made of a transistor and a capacitor. The data is stored in the capacitor. Capacitors loose charge due to leakage and hence DRAM's are volatile devices. To keep the data in the memory, t ...
Module 3: Operating
... • File-system manipulation – program capability to read, write, create, and delete files. • Communications – exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented via shared memory or message passing. ...
... • File-system manipulation – program capability to read, write, create, and delete files. • Communications – exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented via shared memory or message passing. ...
Presentación de PowerPoint
... Programs and processes (processors) Memory (and other data storage elements) In/Out devices (mouse, keyboard, printer, ...) Files and directories Protection and safety Accounting information Network ...
... Programs and processes (processors) Memory (and other data storage elements) In/Out devices (mouse, keyboard, printer, ...) Files and directories Protection and safety Accounting information Network ...
AppGuard - UTSA CS
... to that of AppShield. However, AppGuard differs from AppShield significantly. The largest difference lies in the fact that the system call or interrupt is intercepted directly by the hypervisor. Importantly, AppGuard does not require any modifications to the commodity OS which makes it easily portab ...
... to that of AppShield. However, AppGuard differs from AppShield significantly. The largest difference lies in the fact that the system call or interrupt is intercepted directly by the hypervisor. Importantly, AppGuard does not require any modifications to the commodity OS which makes it easily portab ...
Poster - CS Technion
... • Overhead of “virtualized” ticks is obviously bigger • Further, a VM server can be overwhelmed by ticks: – Example: an IBM S/390 mainframe for which servicing the ticks of multiple idle OSs led to 100% utilization of the physical processor ...
... • Overhead of “virtualized” ticks is obviously bigger • Further, a VM server can be overwhelmed by ticks: – Example: an IBM S/390 mainframe for which servicing the ticks of multiple idle OSs led to 100% utilization of the physical processor ...
Virtual Machine Monitors
... Virtualizing the User/Kernel Boundary Both the guest OS and applications run in (physical) user-mode This is necessary so that privileged instructions trap into the VMM ...
... Virtualizing the User/Kernel Boundary Both the guest OS and applications run in (physical) user-mode This is necessary so that privileged instructions trap into the VMM ...
Computer System Arch..
... Control program Controls execution of user programs and operation of I/O devices. ...
... Control program Controls execution of user programs and operation of I/O devices. ...
HDD for Operating System Concepts
... synchronization, Deadlock handling, Device management and file management ...
... synchronization, Deadlock handling, Device management and file management ...
Lecture-4
... Some operating system do not allow children to continue if the parent terminates – the problem of ‘zombie’ All children terminated - cascading termination ...
... Some operating system do not allow children to continue if the parent terminates – the problem of ‘zombie’ All children terminated - cascading termination ...
project2 - 408 Coding School
... Part I –Iterating over Tasks Linearly Design a kernel module that iterates through all tasks in the system using the for each process() macro. In particular, output the task name (known as executable name), state, and process id of each task. Follow the instructions on the textbook and do the follow ...
... Part I –Iterating over Tasks Linearly Design a kernel module that iterates through all tasks in the system using the for each process() macro. In particular, output the task name (known as executable name), state, and process id of each task. Follow the instructions on the textbook and do the follow ...
Intel On-line Template
... run on processor, or higher priority job –If a job requests additional processors, allocate critical tasks on processor with highest affinity –If an allocated processor becomes idle, hold it for a small amount of time in case task with affinity comes along ...
... run on processor, or higher priority job –If a job requests additional processors, allocate critical tasks on processor with highest affinity –If an allocated processor becomes idle, hold it for a small amount of time in case task with affinity comes along ...
Introduction
... clearly a storage device. However, there are also common cases where such a distinction cannot be made easily. For example, a removable diskette can be viewed as storage, but it also can be used as an I/O device when moving information between different systems. From an operating system’s perspectiv ...
... clearly a storage device. However, there are also common cases where such a distinction cannot be made easily. For example, a removable diskette can be viewed as storage, but it also can be used as an I/O device when moving information between different systems. From an operating system’s perspectiv ...
lecture8
... Threads with a priority of 31 will be run before any others, while threads with a priority of 0 will run only if no other threads are ready. The range of priorities is divided in half with the upper 16 reserved for real-time threads and the lower 16 reserved for variable priority threads. Real-time ...
... Threads with a priority of 31 will be run before any others, while threads with a priority of 0 will run only if no other threads are ready. The range of priorities is divided in half with the upper 16 reserved for real-time threads and the lower 16 reserved for variable priority threads. Real-time ...
ppt
... How can the kernel be eliminated from the call path on SMMPs with user-level threads? To a thread URPC is synchronous, but to the thread library it is asynchronous … explain. Why do kernel thread switches have long term cache and TLB effects that user thread switches do not? ...
... How can the kernel be eliminated from the call path on SMMPs with user-level threads? To a thread URPC is synchronous, but to the thread library it is asynchronous … explain. Why do kernel thread switches have long term cache and TLB effects that user thread switches do not? ...
CS111—Operating System Principles
... In 1991, a Finnish undergraduate student named Linus Torvalds wanted to learn about Intel’s new CPU, the 80386, and he decided that writing his own OS kernel would be a good way to go about it. This desire, plus his dissatisfaction with the weak UNIX variants then available for 80386-class machines ...
... In 1991, a Finnish undergraduate student named Linus Torvalds wanted to learn about Intel’s new CPU, the 80386, and he decided that writing his own OS kernel would be a good way to go about it. This desire, plus his dissatisfaction with the weak UNIX variants then available for 80386-class machines ...
Tutorial 2: Question 1: The services and functions provided by an
... Question 1: The services and functions provided by an operating system can be divided into two main categories. Briefly describe the two categories and discuss how they differ. Question 2: Describe three general methods for passing parameters to the operating system. Question 3: Describe how you cou ...
... Question 1: The services and functions provided by an operating system can be divided into two main categories. Briefly describe the two categories and discuss how they differ. Question 2: Describe three general methods for passing parameters to the operating system. Question 3: Describe how you cou ...
Silberschatz_ AllNotes
... o process creation and management (e.g. running a program) o I/O handling (e.g. set terminal type) o secondary-storage management (e.g. format a disk) o main-memory management (e.g. specify virtual memory parameters) o file-system access (e.g. print file) o protection (e.g. set permissions) o networ ...
... o process creation and management (e.g. running a program) o I/O handling (e.g. set terminal type) o secondary-storage management (e.g. format a disk) o main-memory management (e.g. specify virtual memory parameters) o file-system access (e.g. print file) o protection (e.g. set permissions) o networ ...
Implementing Processes, Threads, and Resources
... • MS-DOS - written to provide the most functionality in the least space – not divided into modules – Although MS-DOS has some structures, its interfaces and levels of functionality are not well separated. • application programs are able to access BIOS routines directly (bypassing DOS). ...
... • MS-DOS - written to provide the most functionality in the least space – not divided into modules – Although MS-DOS has some structures, its interfaces and levels of functionality are not well separated. • application programs are able to access BIOS routines directly (bypassing DOS). ...
Presentazione di PowerPoint - Micrel Lab @ DEIS
... Each CPU execute the same program. Basing upon the CPU id we separate portions of code to be executed by master and slaves. Master CPU executes serial code, initializes synchronization structures in shared memory, etc.. Slave CPUs only execute the parallel regions of code, behaving like the typical ...
... Each CPU execute the same program. Basing upon the CPU id we separate portions of code to be executed by master and slaves. Master CPU executes serial code, initializes synchronization structures in shared memory, etc.. Slave CPUs only execute the parallel regions of code, behaving like the typical ...
Module 4: Processes
... Processes must name each other explicitly: send (P, message) – send a message to process P receive(Q, message) – receive a message from process Q Properties of communication link Links are established automatically. A link is associated with exactly one pair of communicating ...
... Processes must name each other explicitly: send (P, message) – send a message to process P receive(Q, message) – receive a message from process Q Properties of communication link Links are established automatically. A link is associated with exactly one pair of communicating ...
schduling - The Toppers Way
... short-term CPU scheduling. There is no way to know the length of the next CPU burst One approach is to try to approximate. We may not know the length of the next CPU burst, but we may be able to predict its value. We expect that the next CPU burst will be similar in length to the previous ones. Th ...
... short-term CPU scheduling. There is no way to know the length of the next CPU burst One approach is to try to approximate. We may not know the length of the next CPU burst, but we may be able to predict its value. We expect that the next CPU burst will be similar in length to the previous ones. Th ...
Answers to Even-numbered Exercises
... The Free Software Foundation (www.fsf.org) is the principal organizational sponsor of the GNU Project. GNU developed many of the tools, including the C compiler, that are part of the Linux operating system. Linux is the name of the operating system kernel developed by Linus Torvalds, which has since ...
... The Free Software Foundation (www.fsf.org) is the principal organizational sponsor of the GNU Project. GNU developed many of the tools, including the C compiler, that are part of the Linux operating system. Linux is the name of the operating system kernel developed by Linus Torvalds, which has since ...
Course Syllabus
... An operating system is an abstraction of computer system hardware; it manages the sharing of various hardware and software resources among the users of the computer system. The parallel history of hardware and operating system development introduces many key concepts including, for example, processo ...
... An operating system is an abstraction of computer system hardware; it manages the sharing of various hardware and software resources among the users of the computer system. The parallel history of hardware and operating system development introduces many key concepts including, for example, processo ...