Lecture 1 - Operating System Overview
... Time sharing (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 small (< 1 second) Each user has programs executing in memory =⇒ process abstraction If several ...
... Time sharing (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 small (< 1 second) Each user has programs executing in memory =⇒ process abstraction If several ...
bit8_DC_Lecture_2
... • To be run on a single computer having a single Central Processing Unit (CPU); • A problem is broken into a discrete series of instructions. • Instructions are executed one after another. • Only one instruction may execute at any moment in time. ...
... • To be run on a single computer having a single Central Processing Unit (CPU); • A problem is broken into a discrete series of instructions. • Instructions are executed one after another. • Only one instruction may execute at any moment in time. ...
Introduction to Operating Systems
... • Act as a system manager / resource manager - controls hardware and software - act as an interface between user and system • Manages resources of the computer effectively ...
... • Act as a system manager / resource manager - controls hardware and software - act as an interface between user and system • Manages resources of the computer effectively ...
Chapter 10 PowerPoint
... • Files have attributes, usually including the following: – Name: human-readable file name – Identifier: numeric identifier within the file system – Type: some systems formally support different file types – Location: address of the file in a storage device – Size: number of bytes (or words, or bloc ...
... • Files have attributes, usually including the following: – Name: human-readable file name – Identifier: numeric identifier within the file system – Type: some systems formally support different file types – Location: address of the file in a storage device – Size: number of bytes (or words, or bloc ...
OPERATING SYSTEMS:
... • Encapsulate one or more threads sharing process resources • Why processes? • Protected from each other! • OS Protected from them • Processes provides memory protection • Threads more efficient than processes (later) • Fundamental tradeoff between protection and efficiency • Communication easier wi ...
... • Encapsulate one or more threads sharing process resources • Why processes? • Protected from each other! • OS Protected from them • Processes provides memory protection • Threads more efficient than processes (later) • Fundamental tradeoff between protection and efficiency • Communication easier wi ...
A Modeling Perspective of Image-Based Installation
... The output disk in this case is not a copy of any part of the input disk. It contains the logical contents of the input disk, but in different locations on the disk. The partition layout and boot information must be copied and reproduced separately from the file contents. Note that an additional, ac ...
... The output disk in this case is not a copy of any part of the input disk. It contains the logical contents of the input disk, but in different locations on the disk. The partition layout and boot information must be copied and reproduced separately from the file contents. Note that an additional, ac ...
CS 343 OS
... – Cover material in this course that you won’t see elsewhere EECS 213 Introduction to Computer Systems Northwestern University ...
... – Cover material in this course that you won’t see elsewhere EECS 213 Introduction to Computer Systems Northwestern University ...
Lecture-2
... windows (client-server)1984 and MS Windows 1.0 -1985 Many systems include both CLI and GUI interfaces Microsoft Windows is GUI with CLI “command” shell Apple Mac OS X as “Aqua” GUI interface with UNIX kernel underneath and shells available Solaris is CLI with optional GUI interfaces (Java De ...
... windows (client-server)1984 and MS Windows 1.0 -1985 Many systems include both CLI and GUI interfaces Microsoft Windows is GUI with CLI “command” shell Apple Mac OS X as “Aqua” GUI interface with UNIX kernel underneath and shells available Solaris is CLI with optional GUI interfaces (Java De ...
Computer components
... 3. With Windows, user commands are usually entered via a mouse click. How does the user enter a command on a table PC like the iPad or a smartphone like the iPhone? 4. When it is turned on, a computer executes a small bootstrap program that checks to see the hardware is working correctly and loads t ...
... 3. With Windows, user commands are usually entered via a mouse click. How does the user enter a command on a table PC like the iPad or a smartphone like the iPhone? 4. When it is turned on, a computer executes a small bootstrap program that checks to see the hardware is working correctly and loads t ...
Process Concept and State 1 Introduction
... time and other resources utilized by the process for billing purposes, or utility programs to extract the information about the history of the process for purposes related to performance or utilization analysis. Processes in the Blocked state cannot execute until some event occurs, such as the compl ...
... time and other resources utilized by the process for billing purposes, or utility programs to extract the information about the history of the process for purposes related to performance or utilization analysis. Processes in the Blocked state cannot execute until some event occurs, such as the compl ...
![Operating Systems [OS]](http://s1.studyres.com/store/data/003405497_1-fcdfdf12ca283ac50da021c971edcf1f-300x300.png)
Operating Systems [OS]
... Protection and security – The owners of information stored in a multiuser or networked computer system may want to control use of that information, concurrent processes should not interfere with each other n ...
... Protection and security – The owners of information stored in a multiuser or networked computer system may want to control use of that information, concurrent processes should not interfere with each other n ...
Operating Systems I: Chapter 2
... OS to maintain control of the system Problem: How do users programs access necessary privileged instructions (such as I/O)? – The user must ask the OS to perform the operation on the user’s behalf System call – the method used by a process to request action by the operating system – Usually takes th ...
... OS to maintain control of the system Problem: How do users programs access necessary privileged instructions (such as I/O)? – The user must ask the OS to perform the operation on the user’s behalf System call – the method used by a process to request action by the operating system – Usually takes th ...
verification, a coercer would be able to check that the... The authors propose to fix incorrect system call behavior
... commodity operating systems. These OSes may be quite complex, leading to a large trusted-computing base and weaker overall security. Recently, researchers have begun investigating methods for protecting applications from a malicious underlying operating system with a trusted lowestlayer module that ...
... commodity operating systems. These OSes may be quite complex, leading to a large trusted-computing base and weaker overall security. Recently, researchers have begun investigating methods for protecting applications from a malicious underlying operating system with a trusted lowestlayer module that ...
What is real time and why do I need it?
... condition that Job 1 is waiting for occurs (for instance, Job 2 unlocks the resource that both jobs share). At that point, Job 1 gets to execute. The total time that Job 1 must wait may vary, with a minimum, average, and maximum time. This interval is known as the blocking factor. If Job 1 is to mee ...
... condition that Job 1 is waiting for occurs (for instance, Job 2 unlocks the resource that both jobs share). At that point, Job 1 gets to execute. The total time that Job 1 must wait may vary, with a minimum, average, and maximum time. This interval is known as the blocking factor. If Job 1 is to mee ...
ICS 111 - University of Hawaii
... • Timesharing (multitasking) – Logical extension of multiprogramming – 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 – A program l ...
... • Timesharing (multitasking) – Logical extension of multiprogramming – 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 – A program l ...
Syllabus - Jordan University of Science and Technology
... To compare and contrast the common CPU scheduling algorithms used for both preemptive and non-preemptive scheduling of tasks in operating systems, such as priority, performance comparison, and fair-share schemes. ...
... To compare and contrast the common CPU scheduling algorithms used for both preemptive and non-preemptive scheduling of tasks in operating systems, such as priority, performance comparison, and fair-share schemes. ...
OPERATING SYSTEMS STRUCTURES
... SECONDARY STORAGE MANAGEMENT Disks, tapes, optical, ... Free space management ( paging/swapping ) Storage allocation ( what data goes where on disk ) Disk scheduling ...
... SECONDARY STORAGE MANAGEMENT Disks, tapes, optical, ... Free space management ( paging/swapping ) Storage allocation ( what data goes where on disk ) Disk scheduling ...
What is an Operating System?
... One purpose of OS is to hide peculiarities of hardware devices from the ...
... One purpose of OS is to hide peculiarities of hardware devices from the ...
OS 20 I/O Management
... Spooling - hold output for a device If device can serve only one request at a time i.e., Printing ...
... Spooling - hold output for a device If device can serve only one request at a time i.e., Printing ...
Unit I Operating Systems in Distributed Environments
... language, reason why it was totally dependant of the machine. • The OS only can manipulate some peripherals. The batch processing was used to improve the resources use. • In Third Generation (1970’s) OS was more complex because they used concepts such as multiprogramming and time-sharing. ...
... language, reason why it was totally dependant of the machine. • The OS only can manipulate some peripherals. The batch processing was used to improve the resources use. • In Third Generation (1970’s) OS was more complex because they used concepts such as multiprogramming and time-sharing. ...
& inside: THE MAGAZINE OF USENIX & SAGE
... applies well to UNIX systems. It partitions both files and processes into high and low levels. The high level contains critical portions of the system such as init, libraries, and configuration files. The low level is made up of all other system processes and files. Once a highlevel process accesses ...
... applies well to UNIX systems. It partitions both files and processes into high and low levels. The high level contains critical portions of the system such as init, libraries, and configuration files. The low level is made up of all other system processes and files. Once a highlevel process accesses ...
Chapter 14
... Design Goals (continued) • BIOS (Basic Input/Output System) – Direct interface with I/O devices – Contains device drivers • Controls data flow to and from each device (except disk drives) ...
... Design Goals (continued) • BIOS (Basic Input/Output System) – Direct interface with I/O devices – Contains device drivers • Controls data flow to and from each device (except disk drives) ...
File
... 6. Protect users from one another, and the operating system from users. 6. What are the properties of Batch Operating systems? A batch operating system does not provide for interactive running of programs. Data files, programs, and control commands are prepared ahead of time. The operating system re ...
... 6. Protect users from one another, and the operating system from users. 6. What are the properties of Batch Operating systems? A batch operating system does not provide for interactive running of programs. Data files, programs, and control commands are prepared ahead of time. The operating system re ...
system programs
... Processes • Recall: a process is not just a program – it is a dynamic entity. • A given program (e.g. emacs) could be executing many times on a given machine – the machine must represent each execution as a separate process. ...
... Processes • Recall: a process is not just a program – it is a dynamic entity. • A given program (e.g. emacs) could be executing many times on a given machine – the machine must represent each execution as a separate process. ...
Korea Univ Real-Time Systems
... • We don’t want to know which programs will share main memory with other programs when we compile them • In fact, the programs sharing main memory change dynamically while the programs are running • Because of this dynamic interaction, we would like to compile each program into its own address space ...
... • We don’t want to know which programs will share main memory with other programs when we compile them • In fact, the programs sharing main memory change dynamically while the programs are running • Because of this dynamic interaction, we would like to compile each program into its own address space ...