File
... Integration with ReactOS. Virtual frame buffer support. Support for more host operating systems such as FreeBSD. ...
... Integration with ReactOS. Virtual frame buffer support. Support for more host operating systems such as FreeBSD. ...
What is an Operating System?
... What a job stalls waiting for I/O, another job can be run, giving good CPU utilization. The job pool is now under the control of the users. But memory is limited, so this requires swapping some jobs out to disk. One solution is virtual memory, where a job that is only partly in memory can be run ...
... What a job stalls waiting for I/O, another job can be run, giving good CPU utilization. The job pool is now under the control of the users. But memory is limited, so this requires swapping some jobs out to disk. One solution is virtual memory, where a job that is only partly in memory can be run ...
A6_survey1_presentation
... fragmentation – new Registry keys were placed in the first available Registry space. When applications needed to find these keys, an excessive number of memory pages were loaded from disk. ...
... fragmentation – new Registry keys were placed in the first available Registry space. When applications needed to find these keys, an excessive number of memory pages were loaded from disk. ...
Processes
... • For creating a process, the OS must create a complete independent address. The price is high. Even for the switching of the CPU between two processes, because the OS will have to modify registers of the memory management unit (MMU) and invalidate address translation caches such as in the translati ...
... • For creating a process, the OS must create a complete independent address. The price is high. Even for the switching of the CPU between two processes, because the OS will have to modify registers of the memory management unit (MMU) and invalidate address translation caches such as in the translati ...
interrupt
... Use of high-speed memory to hold recently-accessed data. Requires a cache management policy. An example: Main memory can be viewed as a fast ache for secondary storage. The movement of information between levels of a storage hierarchy may be either explicit or implicit, depending on the hardware des ...
... Use of high-speed memory to hold recently-accessed data. Requires a cache management policy. An example: Main memory can be viewed as a fast ache for secondary storage. The movement of information between levels of a storage hierarchy may be either explicit or implicit, depending on the hardware des ...
Operating Systems
... – Manages all the components of a complex computer system in an integrated manner. – Controls the execution of user programs and I/O devices to prevent errors and improper use of computer resources. – Looks over and protects the computer: ...
... – Manages all the components of a complex computer system in an integrated manner. – Controls the execution of user programs and I/O devices to prevent errors and improper use of computer resources. – Looks over and protects the computer: ...
Lecture 3 Processes and Communication
... system’s are implemented using system calls and thus require the more time-consuming task – Once shared memory is established, all accesses are treated as routine memory accesses ...
... system’s are implemented using system calls and thus require the more time-consuming task – Once shared memory is established, all accesses are treated as routine memory accesses ...
Background - The University of Alabama in Huntsville
... functionality of a multiprogramming system for multiple processors, not just one. • Key design issues: Simultaneous concurrent processes or threads kernel routines need to be reentrant to allow several processors to execute the same kernel code simultaneously ...
... functionality of a multiprogramming system for multiple processors, not just one. • Key design issues: Simultaneous concurrent processes or threads kernel routines need to be reentrant to allow several processors to execute the same kernel code simultaneously ...
Introduction
... Swapping of a process – Process table entry System calls to create and terminate processes System calls to allocate/deallocate memory System calls for communication - signals ...
... Swapping of a process – Process table entry System calls to create and terminate processes System calls to allocate/deallocate memory System calls for communication - signals ...
Solution
... Convenience: An operating system makes a computer more convenient to use. Efficiency: An operating system allows the computer system resources to be used in an efficient manner. Ability to evolve: An operating system should be constructed in such a way as to permit the effective development, testing ...
... Convenience: An operating system makes a computer more convenient to use. Efficiency: An operating system allows the computer system resources to be used in an efficient manner. Ability to evolve: An operating system should be constructed in such a way as to permit the effective development, testing ...
OSPP: The Kernel Abstraction
... • Triggered by unexpected program behavior • Or malicious behavior! ...
... • Triggered by unexpected program behavior • Or malicious behavior! ...
Operating System Basics - Computer Sciences User Pages
... • PIC connected to CPU by a special signal • PIC also connected to CPU via I/O bus • Besides the PIC, interrupts can also be generated by software instructions or errors – again, these are usually referred to as exceptions ...
... • PIC connected to CPU by a special signal • PIC also connected to CPU via I/O bus • Besides the PIC, interrupts can also be generated by software instructions or errors – again, these are usually referred to as exceptions ...
Lecture 4 - IT, Sligo
... Total maximum needs =21 means that allocation cannot be met at one time. We need a sequence of allocations which will allow all processes to finish. If we start with P2 when it is finished it will release 5 resources. Next if we allow P1 to run it will release 8 resources and so P3 will be able to f ...
... Total maximum needs =21 means that allocation cannot be met at one time. We need a sequence of allocations which will allow all processes to finish. If we start with P2 when it is finished it will release 5 resources. Next if we allow P1 to run it will release 8 resources and so P3 will be able to f ...
Protection in General-Purpose Operating Systems
... Use of Passwords Passwords are mutually agreed-upon code words, assumed to be known only to the user and the system. The use of of passwords is fairly straightforward. A user enters some piece of identification, such as a name or an assigned user ID, if the identification matches that on file for t ...
... Use of Passwords Passwords are mutually agreed-upon code words, assumed to be known only to the user and the system. The use of of passwords is fairly straightforward. A user enters some piece of identification, such as a name or an assigned user ID, if the identification matches that on file for t ...
Operating System Concepts for System Programmers
... get executed. This 512 byte, boot sector program is called primary boot loader. The primary boot loader program present in the boot sector program is a small program (512 bytes). So it this program can not load the operating system. So instead it loads slightly larger program (called secondary boot ...
... get executed. This 512 byte, boot sector program is called primary boot loader. The primary boot loader program present in the boot sector program is a small program (512 bytes). So it this program can not load the operating system. So instead it loads slightly larger program (called secondary boot ...
ICS 111 - University of Hawaii
... • Timesharing (multitasking) – Logical extension of multiprogramming – CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing • Response time should be < 1 second • Each user has at least one program executing in memory – A program l ...
... • Timesharing (multitasking) – Logical extension of multiprogramming – CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing • Response time should be < 1 second • Each user has at least one program executing in memory – A program l ...
Thomas Edison Associates Report on how to install and optimizing
... The basic function of an Operating System is to control all the Hardware and Software installed in a computer. We can't even install a software without the help of an Operating System. The Operating System acts as a middleman between the user and the computer. It allows the user to install software ...
... The basic function of an Operating System is to control all the Hardware and Software installed in a computer. We can't even install a software without the help of an Operating System. The Operating System acts as a middleman between the user and the computer. It allows the user to install software ...
Chapter_05
... • A process is a model of execution of a program – Can create other processes by making requests to the OS through system calls • Each of these processes is called its child process • Provides parallelism or concurrency ...
... • A process is a model of execution of a program – Can create other processes by making requests to the OS through system calls • Each of these processes is called its child process • Provides parallelism or concurrency ...
Parallel, Distributed, and Multithreaded Computing
... Easy to build, conventional OSes of SISD can be easily be ported Limitation : reliability & expandability. A memory component or any processor failure affects the whole system. Increase of processors leads to memory contention. Ex. : Silicon graphics supercomputers and now Multicore systems ...
... Easy to build, conventional OSes of SISD can be easily be ported Limitation : reliability & expandability. A memory component or any processor failure affects the whole system. Increase of processors leads to memory contention. Ex. : Silicon graphics supercomputers and now Multicore systems ...
Example machine language
... 1. OK disables interrupts when checking flag — re-enables after done with set 2. test-and-set instruction — no interrupts in middle of single instruction The flag is a semaphore (railway signals). Used to protect critical regions (of code) which require mutual exclusion. ...
... 1. OK disables interrupts when checking flag — re-enables after done with set 2. test-and-set instruction — no interrupts in middle of single instruction The flag is a semaphore (railway signals). Used to protect critical regions (of code) which require mutual exclusion. ...
The Linux System
... /boot All the files required for booting Linux on a system. /dev All the devices have their corresponding files here. /etc All the configuration files for the various software are stored here. Don't play with this directory. /home All users will have their 'My Documents' under this directory. If you ...
... /boot All the files required for booting Linux on a system. /dev All the devices have their corresponding files here. /etc All the configuration files for the various software are stored here. Don't play with this directory. /home All users will have their 'My Documents' under this directory. If you ...
unit1
... For Example , if user submits a program(Fortran) with data cards and job control instructions denoted by $ at the beginning. If following tasks are done for specific card has been read $FTN card load Fortran complier from its tape. Compiler transfer Source Code to the Object Code and store i ...
... For Example , if user submits a program(Fortran) with data cards and job control instructions denoted by $ at the beginning. If following tasks are done for specific card has been read $FTN card load Fortran complier from its tape. Compiler transfer Source Code to the Object Code and store i ...