Operating Systems Overview - Physics, Computer Science and
... z Store jobs on a disk (spooling), have computer read them in one at a time and execute them. z Big change in computer usage: y debugging now done offline from print outs and memory dumps. y No more instant feedback. ...
... z Store jobs on a disk (spooling), have computer read them in one at a time and execute them. z Big change in computer usage: y debugging now done offline from print outs and memory dumps. y No more instant feedback. ...
Principles of Operating Systems Lecture 15b
... fair share and more to those who have had less than their fair share ...
... fair share and more to those who have had less than their fair share ...
Operating System
... Main memory provides a fast storage that can be access directly by the CPU. Operating System does the following activities for memory management. ...
... Main memory provides a fast storage that can be access directly by the CPU. Operating System does the following activities for memory management. ...
Linux Kernel—File Systems
... contains pointers to functions that can be used to act on any file An open file descriptor contains pointer to functions which can only ...
... contains pointers to functions that can be used to act on any file An open file descriptor contains pointer to functions which can only ...
Linux - the most important … Linux: SHELL ~$ command –options
... directory tree. This takes care of the hard drives, but you may also have devices that are considered temporary, such as CD-ROMs, thumb drives, and floppy disks. Since these are removable, they do not stay mounted all the time. The /media directory is used by the automatic device mounting mechanisms ...
... directory tree. This takes care of the hard drives, but you may also have devices that are considered temporary, such as CD-ROMs, thumb drives, and floppy disks. Since these are removable, they do not stay mounted all the time. The /media directory is used by the automatic device mounting mechanisms ...
Introduction to Windows NT/2000
... dispatcher objects control dispatching and synchronization (events, mutants, mutexes, semaphores, threads and timers). control objects (asynchronous procedure calls, interrupts, power notify, power status, process and profile objects.) ...
... dispatcher objects control dispatching and synchronization (events, mutants, mutexes, semaphores, threads and timers). control objects (asynchronous procedure calls, interrupts, power notify, power status, process and profile objects.) ...
System Calls
... System calls: The mechanism used by an application program to request service from the operating system. System calls often use a special machine code instruction which causes the processor to change mode (e.g. to "supervisor mode" or "protected mode"). This allows the OS to perform restricted actio ...
... System calls: The mechanism used by an application program to request service from the operating system. System calls often use a special machine code instruction which causes the processor to change mode (e.g. to "supervisor mode" or "protected mode"). This allows the OS to perform restricted actio ...
DS Chapter 6
... Multiprogramming organizes jobs (code and data) so CPU always has one to execute 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 extension in which CPU switches jobs so frequently that users ...
... Multiprogramming organizes jobs (code and data) so CPU always has one to execute 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 extension in which CPU switches jobs so frequently that users ...
process
... Multiprogramming organizes jobs (code and data) so CPU always has one to execute 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 extension in which CPU switches jobs so frequently that users ...
... Multiprogramming organizes jobs (code and data) so CPU always has one to execute 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 extension in which CPU switches jobs so frequently that users ...
pdf
... Structure -- how is an operating system organized ? Concurrency -- how are parallel activities created and controlled ? Sharing -- how are resources shared among users ? Naming -- how are resources named by users or programs ? Protection -- how is one user/program protected from another ? Security - ...
... Structure -- how is an operating system organized ? Concurrency -- how are parallel activities created and controlled ? Sharing -- how are resources shared among users ? Naming -- how are resources named by users or programs ? Protection -- how is one user/program protected from another ? Security - ...
Chapter 2.pdf
... • The key functions of an operating system • Discuss the evolution of operating system for early simple (Batch systems to modern complex systems) ...
... • The key functions of an operating system • Discuss the evolution of operating system for early simple (Batch systems to modern complex systems) ...
壹 - 國立彰化師範大學進修學院
... model is the basis for today’s computers. a. Leibnitz b. Pascal c. Charles Babbage d. von Neumann 4. Which of the following representation is erroneous. a. (10111)2 b. (349)8 c. (3AB)16 d. (256)10 5. What is the minimum number of required bits to store integers lass than 64. a. 6 b. 8 c. 7 d. 5 6. C ...
... model is the basis for today’s computers. a. Leibnitz b. Pascal c. Charles Babbage d. von Neumann 4. Which of the following representation is erroneous. a. (10111)2 b. (349)8 c. (3AB)16 d. (256)10 5. What is the minimum number of required bits to store integers lass than 64. a. 6 b. 8 c. 7 d. 5 6. C ...
Features Of Sprite Operating System
... • UNIX allows processes to share only code but Sprite allows processes to share both code and heap of a process address space. • Sprite initially loads code and initialized heap pages from object files in the file system. • Because of using high-performance file servers, Sprite file system is fast e ...
... • UNIX allows processes to share only code but Sprite allows processes to share both code and heap of a process address space. • Sprite initially loads code and initialized heap pages from object files in the file system. • Because of using high-performance file servers, Sprite file system is fast e ...
Memory Protection
... • Protection state of system – Describes current settings, values of system relevant to protection ...
... • Protection state of system – Describes current settings, values of system relevant to protection ...
operating systems - Computer Science, Columbia University
... As a process executes, it changes state new: The process is being created running: Instructions are being executed waiting: The process is waiting for some event to occur ready: The process is waiting to be assigned to a processor terminated: The process has finished execution ...
... As a process executes, it changes state new: The process is being created running: Instructions are being executed waiting: The process is waiting for some event to occur ready: The process is waiting to be assigned to a processor terminated: The process has finished execution ...
Background: Operating Systems
... – Web server: if files in disk cache, I/O wait spent mostly blocked on write to network – Networked file system client: could compile first part of file while fetching second part ...
... – Web server: if files in disk cache, I/O wait spent mostly blocked on write to network – Networked file system client: could compile first part of file while fetching second part ...
Solaris System Management - Understanding System Concepts -
... File System – collection of directories and files organized in a hierarchical tree structure. It has 11 correspondence to physical storage. Root filesystem (/) is the parent of all filesystems. Mount Point – the directory name on the parent file system where a separate file system may be attac ...
... File System – collection of directories and files organized in a hierarchical tree structure. It has 11 correspondence to physical storage. Root filesystem (/) is the parent of all filesystems. Mount Point – the directory name on the parent file system where a separate file system may be attac ...
Intro. to Computer - web page for staff
... A multiuser, multitasking operating system originally developed by Ken Thompson and Dennis Ritchie at AT&T Bell Laboratories in 1969 for use on minicomputers.UNIX exists in various forms and implementations; among these are version developed at the University of California at Berkeley and versions r ...
... A multiuser, multitasking operating system originally developed by Ken Thompson and Dennis Ritchie at AT&T Bell Laboratories in 1969 for use on minicomputers.UNIX exists in various forms and implementations; among these are version developed at the University of California at Berkeley and versions r ...
Lecture 7: Critical review of semaphores
... Sem4’s are very powerful system programmers tools, provided by operating systems. They can be used (as binary sem4 pairs) to provide mutual exclusion where processes share critical sections (i.e. parts of two or more processes which need to access some shared resource which can only safely be used b ...
... Sem4’s are very powerful system programmers tools, provided by operating systems. They can be used (as binary sem4 pairs) to provide mutual exclusion where processes share critical sections (i.e. parts of two or more processes which need to access some shared resource which can only safely be used b ...
PPT - Duke Database Devils
... all of its memory, etc. •Performance isolation. The OS manages resources (“metal and glass”: computing power, memory, disk space, I/O throughput capacity, network capacity, etc.). Each instance needs the “right amount” of resources to run properly. The OS prevents apps from impacting the performance ...
... all of its memory, etc. •Performance isolation. The OS manages resources (“metal and glass”: computing power, memory, disk space, I/O throughput capacity, network capacity, etc.). Each instance needs the “right amount” of resources to run properly. The OS prevents apps from impacting the performance ...
CMPT 880: Internet Architectures and Protocols
... Resource allocation When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
... Resource allocation When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
int_unix - Pablo Manalastas, PhD
... arguments are separated from each other by one or more white spaces (blanks or tabs). The intention is to have the command work on the supplied arguments. The options or switches modify the standard behaviour of the command. Example: ls -l /var/log/messages ...
... arguments are separated from each other by one or more white spaces (blanks or tabs). The intention is to have the command work on the supplied arguments. The options or switches modify the standard behaviour of the command. Example: ls -l /var/log/messages ...
08 Operating System Support
... services, such as editors and debuggers, to assist the programmer in creating programs. Typically, these services are in the form of utility programs that are not actually part of the OS but are accessible through the OS. • Program execution: A number of tasks need to be performed to execute a progr ...
... services, such as editors and debuggers, to assist the programmer in creating programs. Typically, these services are in the form of utility programs that are not actually part of the OS but are accessible through the OS. • Program execution: A number of tasks need to be performed to execute a progr ...
Al- Balqa Applied University Al-huson University College Dept. of
... D) blocked 8. To access the services of operating system, the interface is provided by the A) system calls B) API C) library D) assembly instructions 9. If a process fails, most operating system write the error INFORMATION to a A) log file B) another running process C) new file D) none of the mentio ...
... D) blocked 8. To access the services of operating system, the interface is provided by the A) system calls B) API C) library D) assembly instructions 9. If a process fails, most operating system write the error INFORMATION to a A) log file B) another running process C) new file D) none of the mentio ...