Slides
... – More reliable (less code is running in kernel mode) – More secure • Detriments: – Performance overhead of user space to kernel space communication ...
... – More reliable (less code is running in kernel mode) – More secure • Detriments: – Performance overhead of user space to kernel space communication ...
Chapter 2 Operating System Overview
... • a collection of one or more threads and associated system resources • programmer has greater control over the modularity of the application and the timing of application related events ...
... • a collection of one or more threads and associated system resources • programmer has greater control over the modularity of the application and the timing of application related events ...
Course Overview, History
... – Huge, parallel, very expensive, not understood • Windows NT/XP: 10 years, 1000s of people, … ...
... – Huge, parallel, very expensive, not understood • Windows NT/XP: 10 years, 1000s of people, … ...
Operating System: A Software Engineering Perspective
... File system requires virtual memory services (buffers) Virtual memory would like to use files for its backing store ...
... File system requires virtual memory services (buffers) Virtual memory would like to use files for its backing store ...
OsQuestionPaper
... 1 is a piece of code which only one process executes at a time 2 is a region prone to deadlock 3 is a piece of code which only a finite number of processes execute 4 is found only in Windows NT operation system 7. The mechanism that bring a page into memory only when it is needed is called _________ ...
... 1 is a piece of code which only one process executes at a time 2 is a region prone to deadlock 3 is a piece of code which only a finite number of processes execute 4 is found only in Windows NT operation system 7. The mechanism that bring a page into memory only when it is needed is called _________ ...
Operating Systems
... having been in existence for a good 20 years. *NIX systems are now becoming a little more popular as desktops with the invention of programs like X Windows, which allows *NIX systems to have a GUI. *NIX systems are still the kings of the networking world, and many of the world's servers run *NIX. ...
... having been in existence for a good 20 years. *NIX systems are now becoming a little more popular as desktops with the invention of programs like X Windows, which allows *NIX systems to have a GUI. *NIX systems are still the kings of the networking world, and many of the world's servers run *NIX. ...
1.1 Introduction
... goal, computer hardware is constructed. Since hardware alone is not particularly easy to use, the common functions of controlling and allocating resources are then brought together into one piece of software: the operating system. A more common definition is that the operating system is the one prog ...
... goal, computer hardware is constructed. Since hardware alone is not particularly easy to use, the common functions of controlling and allocating resources are then brought together into one piece of software: the operating system. A more common definition is that the operating system is the one prog ...
Operating Systems Principles Lecture 1: Introduction
... Transistors and Batch Systems Memory Layout of a Batch System ...
... Transistors and Batch Systems Memory Layout of a Batch System ...
Unit 2 - NIST NACOL
... The Mac OS is an operating system that was designed for the Apple Macintosh computer. It was developed by Apple Inc., who also created Apple I, as well as a number of other more modern products including the ipod, iphone, and ipad. The main competition to the Mac OS is the Windows operating system, ...
... The Mac OS is an operating system that was designed for the Apple Macintosh computer. It was developed by Apple Inc., who also created Apple I, as well as a number of other more modern products including the ipod, iphone, and ipad. The main competition to the Mac OS is the Windows operating system, ...
Operating Systems
... – Mode bit provided by hardware • Provides ability to distinguish when system is running user code or kernel code • Some instructions designated as privileged, only executable in kernel mode • System call changes mode to kernel, return from call resets it to user ...
... – Mode bit provided by hardware • Provides ability to distinguish when system is running user code or kernel code • Some instructions designated as privileged, only executable in kernel mode • System call changes mode to kernel, return from call resets it to user ...
Lecture 1: What is An OS Operating Systems (A) (Honor Track)
... A Typical Computer from a Hardware Point of View ...
... A Typical Computer from a Hardware Point of View ...
CS 111
... risk involved in programs and memory protection, the kernel is in fact the only program that is allowed to run in supervisor mode. This policy maintains safe access to files and programs. The kernel is the only program that starts and maintains user processes. This seems like a fairly simple idea bu ...
... risk involved in programs and memory protection, the kernel is in fact the only program that is allowed to run in supervisor mode. This policy maintains safe access to files and programs. The kernel is the only program that starts and maintains user processes. This seems like a fairly simple idea bu ...
Abstract View of System Components
... • The microkernel has a small footprint and only provides basic or minimal services like, ipc, some memory management, low-level scheduling (dispatching) and low level I/O . • All other services should be implemented as user level services. • This makes the system highly modular, with well-defined i ...
... • The microkernel has a small footprint and only provides basic or minimal services like, ipc, some memory management, low-level scheduling (dispatching) and low level I/O . • All other services should be implemented as user level services. • This makes the system highly modular, with well-defined i ...
OPERATING SYSTEMS DESIGN AND IMPLEMENTATION Third
... Feature/Kernel type Modularity Flexibility Maintainability Security Compatibility Performance ...
... Feature/Kernel type Modularity Flexibility Maintainability Security Compatibility Performance ...
Chapter 1: Introduction to Computers
... o command-line (DOS) interface o graphical (Windows) interface ...
... o command-line (DOS) interface o graphical (Windows) interface ...
doc
... Graphical User Interface (GUI) in which graphical objects called icons represent commonly used features. Applications: these programs load and run applications such as word processors and spreadsheets. Most operating systems allow “multitasking”, the running of more than one application at a time. T ...
... Graphical User Interface (GUI) in which graphical objects called icons represent commonly used features. Applications: these programs load and run applications such as word processors and spreadsheets. Most operating systems allow “multitasking”, the running of more than one application at a time. T ...
ITS 225 (Operating Systems) Lecture Notes
... Protection architecture: with resource sharing, processes and their data must be protected from other processes. Also, errors detected by hardware (e.g. divide by 0) should not crash the system. Instead trap to the kernel: – Kernel logs an error message, dumps process memory, and so on. – Kernel fre ...
... Protection architecture: with resource sharing, processes and their data must be protected from other processes. Also, errors detected by hardware (e.g. divide by 0) should not crash the system. Instead trap to the kernel: – Kernel logs an error message, dumps process memory, and so on. – Kernel fre ...
Lecture-1
... provides services to some other programs • Main advantages: reusability and modularity ...
... provides services to some other programs • Main advantages: reusability and modularity ...
Operating Systems
... Often used as a control device in a dedicated application such as controlling scientific experiments, medical imaging systems, industrial control systems, and some display systems. Processing must be done within the defined constraints, or the system will fail. A real-time system is considered to fu ...
... Often used as a control device in a dedicated application such as controlling scientific experiments, medical imaging systems, industrial control systems, and some display systems. Processing must be done within the defined constraints, or the system will fail. A real-time system is considered to fu ...
CS4023 * Operating Systems
... • Personal computer users want convenience, ease of use and good performance – Don’t care about resource utilization ...
... • Personal computer users want convenience, ease of use and good performance – Don’t care about resource utilization ...
basic-os-concepts
... kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control stat ...
... kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control stat ...
Design of OSes
... performance barrier • Crossing this hardware barrier is costly. • System calls take 10x-1000x more time than a procedure call ...
... performance barrier • Crossing this hardware barrier is costly. • System calls take 10x-1000x more time than a procedure call ...
cs459 - Operating Systems: Introduction
... • Time shared: Responds to multiple users at workstations. Scheduling is based on real time clock “slices”. Goal: Responsive to users • Desktop systems: Single users, with multitasked and multi-programming capabilities. Goal: user friendly and responsive • Multiprocessor: Tightly coupled processors ...
... • Time shared: Responds to multiple users at workstations. Scheduling is based on real time clock “slices”. Goal: Responsive to users • Desktop systems: Single users, with multitasked and multi-programming capabilities. Goal: user friendly and responsive • Multiprocessor: Tightly coupled processors ...
Operating System
... language and the OS constitutes a new combination called as a virtual (extended) machine. Operating System ...
... language and the OS constitutes a new combination called as a virtual (extended) machine. Operating System ...