Module 3: Operating
... the CPU and I/O devices. • Main memory is a volatile storage device. It loses its contents in the case of system failure. • The operating system is responsible for the following activities in connection with memory management: – Keep track of which parts of memory are currently being used and by who ...
... the CPU and I/O devices. • Main memory is a volatile storage device. It loses its contents in the case of system failure. • The operating system is responsible for the following activities in connection with memory management: – Keep track of which parts of memory are currently being used and by who ...
Today: Protection Protection
... 1. What is protection and how does it differ from security? 2. What is a domain? 3. What is a domain access matrix? How are these implemented in actual operating systems? 4. How can entries in an access matrix be modified? What is a domain switch and why is it needed? ...
... 1. What is protection and how does it differ from security? 2. What is a domain? 3. What is a domain access matrix? How are these implemented in actual operating systems? 4. How can entries in an access matrix be modified? What is a domain switch and why is it needed? ...
Services - University of Worcester
... – starts kernel-mode part of the Windows subsystem found at systemroot\System32\Win32k.sys » Windows XP Professional can now switch from text mode to graphics mode » Windows-based applications can run in the Windows subsystem » applications can now access operating system functions, such as displayi ...
... – starts kernel-mode part of the Windows subsystem found at systemroot\System32\Win32k.sys » Windows XP Professional can now switch from text mode to graphics mode » Windows-based applications can run in the Windows subsystem » applications can now access operating system functions, such as displayi ...
Operating System
... merging adjacent disk read requests into a single request. – default: tells LILO which image to boot from by default, such as after the timeout period. This relates to a label of one of the images in the lilo.conf file. If not specified LILO will boot the first image in the file. – image: specifies ...
... merging adjacent disk read requests into a single request. – default: tells LILO which image to boot from by default, such as after the timeout period. This relates to a label of one of the images in the lilo.conf file. If not specified LILO will boot the first image in the file. – image: specifies ...
Questionaire
... 6. Why does caching result in a speed-up most of the time? In which situations will caching not work? ...
... 6. Why does caching result in a speed-up most of the time? In which situations will caching not work? ...
Fundamental Concepts of Operating Systems
... The state of a process includes the value of the program counter (indicating the address of the next instruction to be executed), the value of the generalpurpose registers, its stack for method invocation, its open files, and its code. During the interrupt-handling phase, hardware will save the valu ...
... The state of a process includes the value of the program counter (indicating the address of the next instruction to be executed), the value of the generalpurpose registers, its stack for method invocation, its open files, and its code. During the interrupt-handling phase, hardware will save the valu ...
Operating Systems
... Course Description: Operating Systems, types, characteristics, historical development of operating systems, Linux and Windows operating system structures, Linux system calls, Windows API calls, processes, states, process applications in Linux and Windows, threads, multithread programming, Linux and ...
... Course Description: Operating Systems, types, characteristics, historical development of operating systems, Linux and Windows operating system structures, Linux system calls, Windows API calls, processes, states, process applications in Linux and Windows, threads, multithread programming, Linux and ...
CSCI 4717/5717 Computer Architecture
... • Problem: I/O (Printing, Network, Keyboard, etc.) is so slow compared with CPU that even in multi-programming system, CPU can be idle most of the time • Solutions: – Increase main memory • Expensive • Programmers will eventually use all of this memory for a single process ...
... • Problem: I/O (Printing, Network, Keyboard, etc.) is so slow compared with CPU that even in multi-programming system, CPU can be idle most of the time • Solutions: – Increase main memory • Expensive • Programmers will eventually use all of this memory for a single process ...
lecture6
... start Batch file (automatically executing set of programs/commands) IO.SYS and MSDOS are loaded into the PC memory by a special program called a boot record each time you start up DOS . The command used to initialize new disks with DOS,FORMAT/S puts this on the disk along with IO.SYS and MSDOS.SYS ...
... start Batch file (automatically executing set of programs/commands) IO.SYS and MSDOS are loaded into the PC memory by a special program called a boot record each time you start up DOS . The command used to initialize new disks with DOS,FORMAT/S puts this on the disk along with IO.SYS and MSDOS.SYS ...
Cs238 Introduction to Operating Systems
... • How does he know what the program is going to need to use? • The programmer must supply the ...
... • How does he know what the program is going to need to use? • The programmer must supply the ...
Final Exam - soe.ucsc.edu
... can use the existing hardware to implement a software soluton that will emulate the functionality of the other bits. Your solution should be as efficient as possible. The problem is that you want to know when a page has been referenced or modified. The general solution is to set pages as invalid eve ...
... can use the existing hardware to implement a software soluton that will emulate the functionality of the other bits. Your solution should be as efficient as possible. The problem is that you want to know when a page has been referenced or modified. The general solution is to set pages as invalid eve ...
hand-out - Jan Thorbecke
... • A system call IO request can access data already stored in system cache buffers much faster than it can read from disk. • The system buffer cache will buffer ‘ill-formed’ user IO requests. which makes IO programming much easier • Allows true parallel access to files from multiple threads without t ...
... • A system call IO request can access data already stored in system cache buffers much faster than it can read from disk. • The system buffer cache will buffer ‘ill-formed’ user IO requests. which makes IO programming much easier • Allows true parallel access to files from multiple threads without t ...
Windows XP Boot Process
... Starts the file system • Ntldr contains the program code that Windows XP Professional needs to read and write to disks formatted by using the NTFS or file allocation table (FAT16 or FAT32) file systems. Reads the Boot.ini file • Ntldr reads the contents of the Boot.ini file to determine whether the ...
... Starts the file system • Ntldr contains the program code that Windows XP Professional needs to read and write to disks formatted by using the NTFS or file allocation table (FAT16 or FAT32) file systems. Reads the Boot.ini file • Ntldr reads the contents of the Boot.ini file to determine whether the ...
Computer Organization and Architecture
... • Hit: data appears in some block in the faster level – Hit Rate: The fraction of memory accesses found in the higher level – Hit Time: Time to access the faster level which consists of • Memory Access Time + Time to determine hit/miss ...
... • Hit: data appears in some block in the faster level – Hit Rate: The fraction of memory accesses found in the higher level – Hit Time: Time to access the faster level which consists of • Memory Access Time + Time to determine hit/miss ...
ppt - Dave Reed`s
... Input/Output Devices (I/O) allow the user to interact with the computer Memory stores information to be processed as well as programs (instructions specifying the steps necessary to complete specific tasks) Central Processing Unit (CPU) carries out the instructions to process information ...
... Input/Output Devices (I/O) allow the user to interact with the computer Memory stores information to be processed as well as programs (instructions specifying the steps necessary to complete specific tasks) Central Processing Unit (CPU) carries out the instructions to process information ...
CS 343 OS
... Virtual Memory – abstraction for main memory and I/O devices Processes – abstractions for processor, main memory, and I/O devices ...
... Virtual Memory – abstraction for main memory and I/O devices Processes – abstractions for processor, main memory, and I/O devices ...
slides
... The operating system provides permission management to allow or deny access to files or directories. ...
... The operating system provides permission management to allow or deny access to files or directories. ...
Chapter 1 Bootstrap
... to all of physical memory; and entry 2 is a data segment with the same offset and limit. "32-bit code segment" enables the 80386’s 32-bit mode, so that the processor will default to 32-bit registers, addresses, and arithmetic when executing in the segment. In protected mode, the bottom two bits of a ...
... to all of physical memory; and entry 2 is a data segment with the same offset and limit. "32-bit code segment" enables the 80386’s 32-bit mode, so that the processor will default to 32-bit registers, addresses, and arithmetic when executing in the segment. In protected mode, the bottom two bits of a ...
Operating Systems I: Chapter 1
... Problem: In general, process execution consists of a cycle of CPU execution (CPU burst) and I/O wait (I/O burst). How can we more efficiently utilize the CPU? Solution: Several jobs are kept in main memory at the same time, and the CPU is multiplexed among them – The CPU is never idle (when there ar ...
... Problem: In general, process execution consists of a cycle of CPU execution (CPU burst) and I/O wait (I/O burst). How can we more efficiently utilize the CPU? Solution: Several jobs are kept in main memory at the same time, and the CPU is multiplexed among them – The CPU is never idle (when there ar ...
Operating Systems
... the current modern operating systems. Understand and apply key concepts for process management in modern operating systems. Understand and apply essential concepts for memory management in modern operating systems. Understand and apply important concepts of storage management in modern operating sys ...
... the current modern operating systems. Understand and apply key concepts for process management in modern operating systems. Understand and apply essential concepts for memory management in modern operating systems. Understand and apply important concepts of storage management in modern operating sys ...
PowerPoint
... page that is not in main memory you generate a page fault The operating system must retrieve the desired page from disk and place it in physical memory ...
... page that is not in main memory you generate a page fault The operating system must retrieve the desired page from disk and place it in physical memory ...
Slide 1
... Program scheduling is not an issue with a single-tasking system. On a multitasking system the OS is responsible for the allocation of CPU time in a manner that is fair to the various programs competing for time, as well as maximizing efficient utilization of the system overall. Two level of scheduli ...
... Program scheduling is not an issue with a single-tasking system. On a multitasking system the OS is responsible for the allocation of CPU time in a manner that is fair to the various programs competing for time, as well as maximizing efficient utilization of the system overall. Two level of scheduli ...
Lecture 11
... Program scheduling is not an issue with a single-tasking system. On a multitasking system the OS is responsible for the allocation of CPU time in a manner that is fair to the various programs competing for time, as well as maximizing efficient utilization of the system overall. Two level of scheduli ...
... Program scheduling is not an issue with a single-tasking system. On a multitasking system the OS is responsible for the allocation of CPU time in a manner that is fair to the various programs competing for time, as well as maximizing efficient utilization of the system overall. Two level of scheduli ...
MachOs-by-Doug-Hill-Liza-Hill-Josh-Mickley-Alex
... Concept of the Mach Kernel • Developed by Carnegie Mellon University from ...
... Concept of the Mach Kernel • Developed by Carnegie Mellon University from ...