Example Sheet for Operating Systems I (Part IA)
... (c) Non-blocking I/O is possible even when using a block device. (d) Shortest job first (SJF) is an optimal scheduling algorithm. (e) Round-robin scheduling can suffer from the so-called ‘convoy effect’. (f) A paged virtual memory is smaller than a segmented one. (g) Direct memory access (DMA) makes d ...
... (c) Non-blocking I/O is possible even when using a block device. (d) Shortest job first (SJF) is an optimal scheduling algorithm. (e) Round-robin scheduling can suffer from the so-called ‘convoy effect’. (f) A paged virtual memory is smaller than a segmented one. (g) Direct memory access (DMA) makes d ...
Operating System
... When two or more programs are residing in memory at the same time, then sharing the processor is referred to the multiprogramming. Multiprogramming assumes a single shared processor. Multiprogramming increases CPU utilization by organizing jobs so that the CPU always has one to execute. Following fi ...
... When two or more programs are residing in memory at the same time, then sharing the processor is referred to the multiprogramming. Multiprogramming assumes a single shared processor. Multiprogramming increases CPU utilization by organizing jobs so that the CPU always has one to execute. Following fi ...
CS 502 Introduction to Operating Systems
... • A resource is divided into smaller versions of itself and each app/user is given its own part of the resource. ...
... • A resource is divided into smaller versions of itself and each app/user is given its own part of the resource. ...
Introduction and Overview - William & Mary Computer Science
... A special register holds which mode the CPU is in Certain instructions can only be executed when in kernel mode Likewise, certain memory locations can only be written when in kernel mode • Only OS code is executed in kernel mode • Only OS can modify its memory • The mode register can only be modifie ...
... A special register holds which mode the CPU is in Certain instructions can only be executed when in kernel mode Likewise, certain memory locations can only be written when in kernel mode • Only OS code is executed in kernel mode • Only OS can modify its memory • The mode register can only be modifie ...
CSCI 530 – OPERATING SYSTEMS Semester: Time:
... Students are expected to follow all instructions and visit eCollege regularly many times weekly to complete the materials for this online course. If a student is unable to submit assignments by the due date for the assignment, they are expected to make alternative arrangements to assure that the ass ...
... Students are expected to follow all instructions and visit eCollege regularly many times weekly to complete the materials for this online course. If a student is unable to submit assignments by the due date for the assignment, they are expected to make alternative arrangements to assure that the ass ...
Unix hardware level
... • The VM manager in NT uses a page-based management scheme with a page size of 4KB. Pages of data that are assigned to a process but are not in physical memory are stored in the paging file on disk • The VM manager uses 32 bit addresses, so each process has a 4 GB virtual address space. The upper 2G ...
... • The VM manager in NT uses a page-based management scheme with a page size of 4KB. Pages of data that are assigned to a process but are not in physical memory are stored in the paging file on disk • The VM manager uses 32 bit addresses, so each process has a 4 GB virtual address space. The upper 2G ...
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 ...
DOS - InfoShare.tk
... • The IO.SYS file consists of two separate modules. • The first module consist of BIOS which consist of system initialization program init which determines the linked set of resident device drivers for the console, auxiliary port, printer, clock devices and some hardware specific initialization code ...
... • The IO.SYS file consists of two separate modules. • The first module consist of BIOS which consist of system initialization program init which determines the linked set of resident device drivers for the console, auxiliary port, printer, clock devices and some hardware specific initialization code ...
Architectural Support for Protection Rings
... A User Program must be able to create a file and write data to that file. It can read files in that user’s directory, but usually not in other user’s directory. It cannot access the shared printer directly. The Print Manager must be able to: Read a temporary file in any user’s directory and delete t ...
... A User Program must be able to create a file and write data to that file. It can read files in that user’s directory, but usually not in other user’s directory. It cannot access the shared printer directly. The Print Manager must be able to: Read a temporary file in any user’s directory and delete t ...
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 Systems - Cardiff University
... – Complex design – each functionality has to be divided into parts to fit into different layers. ...
... – Complex design – each functionality has to be divided into parts to fit into different layers. ...
What is an Operating System?
... hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is ...
... hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is ...
process - Erciyes Üniversitesi IIBF
... Multiprogramming organizes jobs (code and data) so CPU always has one to execute A subset of total jobs in system is kept in memory One job selected and run via job scheduling When it has to wait (for I/O for example), OS switches to another job Timesharing (multitasking) is logical extens ...
... Multiprogramming organizes jobs (code and data) so CPU always has one to execute A subset of total jobs in system is kept in memory One job selected and run via job scheduling When it has to wait (for I/O for example), OS switches to another job Timesharing (multitasking) is logical extens ...
WORD
... contains the addresses of all the service routines ◦ Incoming interrupts are disabled while another interrupt is being processed ◦ Trap is a software generated interrupt caused by error or user request ◦ OS determines which type of interrupt has occurred by polling or the vectored interrupt system S ...
... contains the addresses of all the service routines ◦ Incoming interrupts are disabled while another interrupt is being processed ◦ Trap is a software generated interrupt caused by error or user request ◦ OS determines which type of interrupt has occurred by polling or the vectored interrupt system S ...
Study Guide to Accompany Operating Systems Concepts 9 Ed by
... contains the addresses of all the service routines ◦ Incoming interrupts are disabled while another interrupt is being processed ◦ Trap is a software generated interrupt caused by error or user request ◦ OS determines which type of interrupt has occurred by polling or the vectored interrupt system S ...
... contains the addresses of all the service routines ◦ Incoming interrupts are disabled while another interrupt is being processed ◦ Trap is a software generated interrupt caused by error or user request ◦ OS determines which type of interrupt has occurred by polling or the vectored interrupt system S ...
doc
... contains the addresses of all the service routines ◦ Incoming interrupts are disabled while another interrupt is being processed ◦ Trap is a software generated interrupt caused by error or user request ◦ OS determines which type of interrupt has occurred by polling or the vectored interrupt system S ...
... contains the addresses of all the service routines ◦ Incoming interrupts are disabled while another interrupt is being processed ◦ Trap is a software generated interrupt caused by error or user request ◦ OS determines which type of interrupt has occurred by polling or the vectored interrupt system S ...
PPT
... Expose the raw capability of the hardware, minimizing the “tax” Optimize for the expected (any?) workload Be simple enough that the code executes quickly and can be debugged easily Does this sound like a big job to anyone? ...
... Expose the raw capability of the hardware, minimizing the “tax” Optimize for the expected (any?) workload Be simple enough that the code executes quickly and can be debugged easily Does this sound like a big job to anyone? ...
ppt
... Message-based kernel so message handling must be efficient Uses virtual memory remapping (large messages) Message transfer modifies receiving task’s address space to include a copy of the message contents Copy on Write CS533 - Concepts of Operating Systems ...
... Message-based kernel so message handling must be efficient Uses virtual memory remapping (large messages) Message transfer modifies receiving task’s address space to include a copy of the message contents Copy on Write CS533 - Concepts of Operating Systems ...
ppt - Fordham University
... – Multiprogramming organizes jobs (code and data) so CPU always has one to execute – A subset of total jobs in system is kept in memory – One job selected and run via job scheduling – When it has to wait (for I/O for example), OS switches to another job • Timesharing (multitasking) is logical extens ...
... – Multiprogramming organizes jobs (code and data) so CPU always has one to execute – A subset of total jobs in system is kept in memory – One job selected and run via job scheduling – When it has to wait (for I/O for example), OS switches to another job • Timesharing (multitasking) is logical extens ...
ITS 225 (Operating Systems) Lecture Notes
... A single process might monopolize CPU or memory. One process might overwrite another’s memory. If total memory exceeds system memory, backing store is required. System state (program counter, registers, etc) needs to be saved and restored on every context switch. ...
... A single process might monopolize CPU or memory. One process might overwrite another’s memory. If total memory exceeds system memory, backing store is required. System state (program counter, registers, etc) needs to be saved and restored on every context switch. ...
SC PE
... (hardware), which is set to a fixed time-slice. • When an interrupt is triggered, CPU hardware 1. Stops the execution of the current program, 2. Saves the context of the current program, 3. Jumps to the subroutine that handles the ...
... (hardware), which is set to a fixed time-slice. • When an interrupt is triggered, CPU hardware 1. Stops the execution of the current program, 2. Saves the context of the current program, 3. Jumps to the subroutine that handles the ...
1.01
... When it has to wait (for I/O for example), OS switches to another job Timesharing (multitasking) is logical extension in which 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 ...
... When it has to wait (for I/O for example), OS switches to another job Timesharing (multitasking) is logical extension in which 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 ...