Operating System
... In UNIX, every thing is either a file or a process. A file is a collection of data. They are used to store large amount of information permanently. Directories are considered as files. In addition, physical devices are also considered as files in UNIX. A process is a program in execution. A ...
... In UNIX, every thing is either a file or a process. A file is a collection of data. They are used to store large amount of information permanently. Directories are considered as files. In addition, physical devices are also considered as files in UNIX. A process is a program in execution. A ...
Lecture Overview Operating System Components
... possible to separate these two functions • A virtual machine provides multiprogramming only by providing an exact virtual copies of the bare hardware • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory • Each virtual ma ...
... possible to separate these two functions • A virtual machine provides multiprogramming only by providing an exact virtual copies of the bare hardware • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory • Each virtual ma ...
Module 3: Operating
... operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing either on the same computer or on different systems tied ...
... operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing either on the same computer or on different systems tied ...
Operating Systems - Home - KSU Faculty Member websites
... 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 has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If ...
... 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 has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If ...
Operating Systems Questions
... 1. Write a definition for an operating system; 2. Describe the main features of an operating system for example: the cost, reliability, ease of use, type of interface and how they can be customised. You need to make sure you’re using different operating systems as examples; 3. Explain what an interr ...
... 1. Write a definition for an operating system; 2. Describe the main features of an operating system for example: the cost, reliability, ease of use, type of interface and how they can be customised. You need to make sure you’re using different operating systems as examples; 3. Explain what an interr ...
Document
... • Specialized programs that allow communication between a device and the computer • Loaded into memory each time a computer is started • When a new device is added, new device drivers must be installed ...
... • Specialized programs that allow communication between a device and the computer • Loaded into memory each time a computer is started • When a new device is added, new device drivers must be installed ...
COS 318: Operating Systems Overview Kai Li Computer Science Department
... Support Multiple Processes ...
... Support Multiple Processes ...
DOS (“Disk Operating System”)
... Windows File System • C:\Users & … • C:\Documents and Settings – Home Directories • Your own “private” storage real estate. • Each user account has one (by default) • They might exist for users that don’t‘ – Users can get deleted and still leave their home directory ...
... Windows File System • C:\Users & … • C:\Documents and Settings – Home Directories • Your own “private” storage real estate. • Each user account has one (by default) • They might exist for users that don’t‘ – Users can get deleted and still leave their home directory ...
Judul - my documentation
... – Proprietary OS • System 9 is OS from 1999, but still popular • Mac OS X is based on BSD Unix kernel • Tiger is 2005 release of Mac OS X; features include – Spotlight – a desktop search engine for locating files on local hard disk – Dashboard – for creating desktop “widgets” – Automator – automatic ...
... – Proprietary OS • System 9 is OS from 1999, but still popular • Mac OS X is based on BSD Unix kernel • Tiger is 2005 release of Mac OS X; features include – Spotlight – a desktop search engine for locating files on local hard disk – Dashboard – for creating desktop “widgets” – Automator – automatic ...
What is an Operating System
... performance: how do we make it all go fast? reliability: what happens if something goes wrong – hardware or software extensibility: can we add new features? communication: how do programs exchange information concurrency: how are parallel activities created and controlled? scale: what happens as dem ...
... performance: how do we make it all go fast? reliability: what happens if something goes wrong – hardware or software extensibility: can we add new features? communication: how do programs exchange information concurrency: how are parallel activities created and controlled? scale: what happens as dem ...
slides - network systems lab @ sfu
... Easy to maintain, update, and debug: focus on one module at a time Efficient: modules can call each others directly (no layers in between and no message passing) ...
... Easy to maintain, update, and debug: focus on one module at a time Efficient: modules can call each others directly (no layers in between and no message passing) ...
09CS212 OPERATING SYSTEM Credits: 3:0:0 Course Objective: To
... 09CS212 OPERATING SYSTEM Credits: 3:0:0 Course Objective: To gain knowledge about the Operating Systems concepts such as process, main management, secondary memory management, CPU and disk scheduling etc. ...
... 09CS212 OPERATING SYSTEM Credits: 3:0:0 Course Objective: To gain knowledge about the Operating Systems concepts such as process, main management, secondary memory management, CPU and disk scheduling etc. ...
PPT
... Devices that are supported What hardware platforms does it run on? Applications that are available for that OS Who developed the code? Who supports the code? How often does the system crash? Reliability? Do you pay for it? ...
... Devices that are supported What hardware platforms does it run on? Applications that are available for that OS Who developed the code? Who supports the code? How often does the system crash? Reliability? Do you pay for it? ...
Chapter 1 PowerPoint
... • Protection: any mechanism for controlling access of processes or users to resources defined by the OS • Security: defense of the system against internal and external attacks – Huge range, including denial-of-service, worms, viruses, identity theft, theft of service • Systems generally first distin ...
... • Protection: any mechanism for controlling access of processes or users to resources defined by the OS • Security: defense of the system against internal and external attacks – Huge range, including denial-of-service, worms, viruses, identity theft, theft of service • Systems generally first distin ...
Ch2. Operating System Structures
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
CMPT 880: Internet Architectures and Protocols
... Easy to maintain, update, and debug: focus on one module at a time Efficient: modules can call each others directly (no layers in between and no message passing) ...
... Easy to maintain, update, and debug: focus on one module at a time Efficient: modules can call each others directly (no layers in between and no message passing) ...
Unix
... Wildcard character (*) Other examples of using the * ls *.cpp // this lists all of your .cpp programs that are in the current directory. cp *.output outfiles // copies all files ending with .output into a directory called outfiles ...
... Wildcard character (*) Other examples of using the * ls *.cpp // this lists all of your .cpp programs that are in the current directory. cp *.output outfiles // copies all files ending with .output into a directory called outfiles ...
Unix
... Wildcard character (*) Other examples of using the * ls *.cpp // this lists all of your .cpp programs that are in the current directory. cp *.output outfiles // copies all files ending with .output into a directory called outfiles ...
... Wildcard character (*) Other examples of using the * ls *.cpp // this lists all of your .cpp programs that are in the current directory. cp *.output outfiles // copies all files ending with .output into a directory called outfiles ...
lecture33-dec15
... • Multimedia systems • Real-time systems • Distributed systems (Chapters 16-18) ...
... • Multimedia systems • Real-time systems • Distributed systems (Chapters 16-18) ...
System Software and Operating Systems
... in that they execute two or more applications running simultaneously (actually they switch back and forth between the applications) Older single-tasking operating systems could only do one thing at a time ...
... in that they execute two or more applications running simultaneously (actually they switch back and forth between the applications) Older single-tasking operating systems could only do one thing at a time ...
Operating Systems - Glyndwr University
... Windows 2000/2003 Server has a telnet server, similar to the telnet service in UNIX. Windows 2000/2003 Server can function as a terminal services server, users connected as terminal services clients will actually be using the CPU and memory of the Windows server. ...
... Windows 2000/2003 Server has a telnet server, similar to the telnet service in UNIX. Windows 2000/2003 Server can function as a terminal services server, users connected as terminal services clients will actually be using the CPU and memory of the Windows server. ...
Basics of Operating Systems
... The structures of computer systems and operating systems. Operating system as the users work environment. Character and graphical user interface. Single and multi-purpose systems. Multiuser systems. Distributed systems. A layered model of the operating system. The kernel of the system: ...
... The structures of computer systems and operating systems. Operating system as the users work environment. Character and graphical user interface. Single and multi-purpose systems. Multiuser systems. Distributed systems. A layered model of the operating system. The kernel of the system: ...
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.