ppt
... Expose all system information and collect data that application can not easily derive locally ...
... Expose all system information and collect data that application can not easily derive locally ...
now
... ◦ System-call interface maintains a table indexed according to these numbers The system call interface invokes the intended system call in OS kernel and returns status of the system call and any return values The caller need know nothing about how the system call is implemented ◦ Just needs to obey ...
... ◦ System-call interface maintains a table indexed according to these numbers The system call interface invokes the intended system call in OS kernel and returns status of the system call and any return values The caller need know nothing about how the system call is implemented ◦ Just needs to obey ...
Operating Systems
... increases the amount of data that can be held in memory at one time. When the memory chips get full, some of the data is paged out to the hard disk. This is called swapping. Windows uses a swap file for this purpose. Storage A more technical task is that of disk management. Under some operating syst ...
... increases the amount of data that can be held in memory at one time. When the memory chips get full, some of the data is paged out to the hard disk. This is called swapping. Windows uses a swap file for this purpose. Storage A more technical task is that of disk management. Under some operating syst ...
Chapter 2
... • System V: 1983 - A different virtual memory architecture • System V Release 2 (SVR2): 1984 • SVR3: 1987 • Introduced interprocess communication, shared memory, semaphores, message passing, remote file sharing, shared libraries • SVR4:1989 ...
... • System V: 1983 - A different virtual memory architecture • System V Release 2 (SVR2): 1984 • SVR3: 1987 • Introduced interprocess communication, shared memory, semaphores, message passing, remote file sharing, shared libraries • SVR4:1989 ...
Lecture 4: September 11 4.1 Processes 4.2 Memory and Secondary
... processes may be associated with the same program; for example, opening up several windows of the same program typically means more than one process is being executed. In the computing world, processes are formally defined by the operating system(s)(OS) running them and so may differ in detail from ...
... processes may be associated with the same program; for example, opening up several windows of the same program typically means more than one process is being executed. In the computing world, processes are formally defined by the operating system(s)(OS) running them and so may differ in detail from ...
83-381 Syllabus English
... First Semester 2016/17 Weekly hours: 2 lecture + 1 training 1) Course objectives: An operating system is a set of subsystems/programs that manage a computer system composed of hardware and software resources, providing common services/utilities needed to run system and user applications. All compute ...
... First Semester 2016/17 Weekly hours: 2 lecture + 1 training 1) Course objectives: An operating system is a set of subsystems/programs that manage a computer system composed of hardware and software resources, providing common services/utilities needed to run system and user applications. All compute ...
ppt
... – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them • Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request ...
... – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them • Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request ...
Chapter 1: Intro to OS
... switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
... switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
Course Title Operating Systems Course Code CUIT 109 Credits
... Individual Study hrs: 59 Assessment: 13 Notional Hours: 120 Credits 12 The course’s focus is on how an Operating System manages system resources e.g. memory, CPU files etc, while avoiding possible deadlocks and / or starvation. By the end of the course students should be able to : Describe the nec ...
... Individual Study hrs: 59 Assessment: 13 Notional Hours: 120 Credits 12 The course’s focus is on how an Operating System manages system resources e.g. memory, CPU files etc, while avoiding possible deadlocks and / or starvation. By the end of the course students should be able to : Describe the nec ...
Memory Management
... Disks (secondary storage) provide longterm storage, but are awkward to use directly ...
... Disks (secondary storage) provide longterm storage, but are awkward to use directly ...
1. Operating system
... O/S moves pages to/from disk and memory as required a memory management unit (under control of O/S) maps memory references by a program to physical memory programs cannot access physical memory outside their own address space, e.g. operating system memory or memory allocated to other processes ...
... O/S moves pages to/from disk and memory as required a memory management unit (under control of O/S) maps memory references by a program to physical memory programs cannot access physical memory outside their own address space, e.g. operating system memory or memory allocated to other processes ...
document
... Command processor: CCP: was a simple command line interface, patterned after RSTS for the PDP-11. Commands generally took the form of a keyword followed by a list of parameters, separated by spaces. Commands not recognized as part of the built-in commands were assumed to be transient user programs, ...
... Command processor: CCP: was a simple command line interface, patterned after RSTS for the PDP-11. Commands generally took the form of a keyword followed by a list of parameters, separated by spaces. Commands not recognized as part of the built-in commands were assumed to be transient user programs, ...
2.4 The service and functions provided by an operating system can
... two main categories. Briefly describes the two categories and discuss how they differ. ANS: One class of services provided by an operating system is to enforce protection between different processes running concurrently in the system. Processes are allowed to access only those memory locations that ...
... two main categories. Briefly describes the two categories and discuss how they differ. ANS: One class of services provided by an operating system is to enforce protection between different processes running concurrently in the system. Processes are allowed to access only those memory locations that ...
Operating Systems
... Utility software: programs for performing fundamental activities, but not included in operating systems. n ...
... Utility software: programs for performing fundamental activities, but not included in operating systems. n ...
CIT 500: IT Fundamentals
... E.g., The OS performs the task of dealing with complicated hardware resources and gives you a comprehensive and simple machine, ready to use. In this way, the OS provides a virtual machine. ...
... E.g., The OS performs the task of dealing with complicated hardware resources and gives you a comprehensive and simple machine, ready to use. In this way, the OS provides a virtual machine. ...
Syllabus - Marwadi University
... Write a shell script to read n numbers as command arguments and sort them in descending/ascending order. Write a shell script to check entered string is palindrome or not. Write an awk program using function, which convert each word in a given text into capital. Write a program for process creation ...
... Write a shell script to read n numbers as command arguments and sort them in descending/ascending order. Write a shell script to check entered string is palindrome or not. Write an awk program using function, which convert each word in a given text into capital. Write a program for process creation ...
Summary: OS Concepts System Calls
... – different spaces – different levels of executions and privileges – system calls (kernel) application code library code ...
... – different spaces – different levels of executions and privileges – system calls (kernel) application code library code ...
Exercises
... are easy to modify. No two system installations are the same, so each installation may want to tune the operating system to suit its needs. With mechanism and policy separate, the policy may be changed at will while the mechanism stays unchanged. This arrangement provides a more flexible system. 2.2 ...
... are easy to modify. No two system installations are the same, so each installation may want to tune the operating system to suit its needs. With mechanism and policy separate, the policy may be changed at will while the mechanism stays unchanged. This arrangement provides a more flexible system. 2.2 ...
2. OS Components
... Other operating systems, such as MS-DOS and UNIX, treat the command interpreter as a special program that is running when a job is initiated, or when a user first logs on (on timesharing systems). ...
... Other operating systems, such as MS-DOS and UNIX, treat the command interpreter as a special program that is running when a job is initiated, or when a user first logs on (on timesharing systems). ...
LECTURE 33 APPLICATION I/O INTERFACE
... example sectors or sector clusters on a disk Commands/calls include read, write, seek Access is typically through a file-system interface Raw I/O or file-system access - “binary xfr” of file data - interpretation is in application (personality of file lost) Memory-mapped (to VM) file acces ...
... example sectors or sector clusters on a disk Commands/calls include read, write, seek Access is typically through a file-system interface Raw I/O or file-system access - “binary xfr” of file data - interpretation is in application (personality of file lost) Memory-mapped (to VM) file acces ...
Solaris System Management - Understanding System Concepts -
... Use the ps command to list the running processes. – ps –ef ...
... Use the ps command to list the running processes. – ps –ef ...
evolution of operating systems
... Distributed operating systems 1980’s ¾ Arose from networking technology advances ¾ Used resources from many computers and gave the illusion of one to multiple users ¾ Parts of a program run simultaneously on two or more computers ...
... Distributed operating systems 1980’s ¾ Arose from networking technology advances ¾ Used resources from many computers and gave the illusion of one to multiple users ¾ Parts of a program run simultaneously on two or more computers ...
Plan 9 from Bell Labs
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Plan 9 from Bell Labs is a distributed operating system, originally developed by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002. It takes some of the principles of Unix, developed in the same research group, but extends these to a networked environment with graphics terminals.In Plan 9, virtually all computing resources, including files, network connections, and peripheral devices, are represented through the file system rather than specialized interfaces. A unified network protocol called 9P ties a network of computers running Plan 9 together, allowing them to share all resources so represented.The name Plan 9 from Bell Labs is a reference to the Ed Wood 1959 cult science fiction Z-movie Plan 9 from Outer Space. Also, Glenda, the Plan 9 Bunny, is presumably a reference to Wood's film Glen or Glenda. The system continues to be used and developed by operating system researchers and hobbyists.