CIT 500: IT Fundamentals
... comprehensive and simple machine, ready to use. In this way, the OS provides a virtual machine. ...
... comprehensive and simple machine, ready to use. In this way, the OS provides a virtual machine. ...
Chapter 2: OS Structures
... • Start by defining goals and specifications • User goals and System goals – User goals – operating system should be convenient to use, easy to learn, reliable, safe, and fast – System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, error-fr ...
... • Start by defining goals and specifications • User goals and System goals – User goals – operating system should be convenient to use, easy to learn, reliable, safe, and fast – System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, error-fr ...
![[intro.pptx]](http://s1.studyres.com/store/data/000013153_1-8c71297723930f81fc51edc276eba587-300x300.png)
Lect03
... the OS rotates its various jobs in and out of execution via time-sharing o Each job gets a predetermined “time slice” o At end of time slice current job is set aside and a new one starts o By rapidly shuffling jobs, illusion of several jobs executing simultaneously is created ...
... the OS rotates its various jobs in and out of execution via time-sharing o Each job gets a predetermined “time slice” o At end of time slice current job is set aside and a new one starts o By rapidly shuffling jobs, illusion of several jobs executing simultaneously is created ...
The SAS System for the UNIX Environment
... an early interest in UNIX operating systems. They quickly began to be used in computer sciences departments nationwide. The . simple structure of the UNIX operating systems pre_ides an ideal environment for continued research and development of computing theory and modeling. ...
... an early interest in UNIX operating systems. They quickly began to be used in computer sciences departments nationwide. The . simple structure of the UNIX operating systems pre_ides an ideal environment for continued research and development of computing theory and modeling. ...
Shin Liu 2/26/2015 Chapter 4 Power Point Answers and Questions 1
... What are desktop operating systems? Compare Windows, Mac OS, Linux and Chrome OS. Discuss virtualization. Desktop operating system are four individual systems; Windows, Mac OS, UNIX, and LINUX. Windows, Mac OS, Linux and Chrome OS are all similar because they desktop operating systems, but from diff ...
... What are desktop operating systems? Compare Windows, Mac OS, Linux and Chrome OS. Discuss virtualization. Desktop operating system are four individual systems; Windows, Mac OS, UNIX, and LINUX. Windows, Mac OS, Linux and Chrome OS are all similar because they desktop operating systems, but from diff ...
virtual machine
... • Accounting – To keep track of which users use how much and what kinds of computer resources • Protection and security – Protection • ensuring that all access to system resources is controlled ...
... • Accounting – To keep track of which users use how much and what kinds of computer resources • Protection and security – Protection • ensuring that all access to system resources is controlled ...
Introduction
... LINUX is a free UNIX-type operating system originally created by Linus Torlvads with the assistance of developers around the world. The source code for Linux is freely available to everyone. The commands of linux are similar to unix. ...
... LINUX is a free UNIX-type operating system originally created by Linus Torlvads with the assistance of developers around the world. The source code for Linux is freely available to everyone. The commands of linux are similar to unix. ...
Operating Systems
... Finland. Like most computer science courses, a big component of it was taught on (and about) Unix. Unix was the wonder operating system of the 1970s and 1980s: both a textbook example of the principles of operating system design, and sufficiently robust to be the standard OS in engineering and scien ...
... Finland. Like most computer science courses, a big component of it was taught on (and about) Unix. Unix was the wonder operating system of the 1970s and 1980s: both a textbook example of the principles of operating system design, and sufficiently robust to be the standard OS in engineering and scien ...
Components of a Linux System
... Its history has been one of collaboration by many users from all around the world, corresponding almost exclusively over the Internet ...
... Its history has been one of collaboration by many users from all around the world, corresponding almost exclusively over the Internet ...
The Mach System
... • A microkernel seems to optimize operating system design – So, should make operating system (lower level) easier to modify – Layered approach– so, seems good in principle • Is the UNIX (or other “user application” O/S) really a User ...
... • A microkernel seems to optimize operating system design – So, should make operating system (lower level) easier to modify – Layered approach– so, seems good in principle • Is the UNIX (or other “user application” O/S) really a User ...
Ch1 Introduction to the Linux Kernel
... See a subset of the machine's available resources Unable to perform certain system functions, directly ...
... See a subset of the machine's available resources Unable to perform certain system functions, directly ...
document
... – First demonstrated in 1961, and used at MIT until the mid 1970’s. – It established the effectiveness of the timesharing concept, and its impact on the productivity of programmers and users. – It also illustrated that although timesharing was workable, a great deal more time was spend by the OS swi ...
... – First demonstrated in 1961, and used at MIT until the mid 1970’s. – It established the effectiveness of the timesharing concept, and its impact on the productivity of programmers and users. – It also illustrated that although timesharing was workable, a great deal more time was spend by the OS swi ...
Introduction to the course
... Many OS services are provided by user-level servers e.g. the environmental subsystems. The POSIX subsystem is now called Interix and includes open source programs and libraries (not after Windows 8) ...
... Many OS services are provided by user-level servers e.g. the environmental subsystems. The POSIX subsystem is now called Interix and includes open source programs and libraries (not after Windows 8) ...
Operating Systems Questions
... Cambridge Tech LO1 – Operating Systems task You are to write a report that must contain the following information about operating systems. I will expect there to be examples of different operating systems used so you may want to talk about how Windows XP performs a task compared to a single task ope ...
... Cambridge Tech LO1 – Operating Systems task You are to write a report that must contain the following information about operating systems. I will expect there to be examples of different operating systems used so you may want to talk about how Windows XP performs a task compared to a single task ope ...
lec01
... hierarchical file systems, devices as files, … Building it was more difficult than expected Technology caught up ...
... hierarchical file systems, devices as files, … Building it was more difficult than expected Technology caught up ...
Chapter 21: The Linux System Objectives 21.1 History (不考) Linux 2.0
... around the world, corresponding almost exclusively over the Internet ...
... around the world, corresponding almost exclusively over the Internet ...
Operating Systems
... 3. Input/Output operations 4. Error detection 5. Resource allocation 6. Accounting 7. protection ...
... 3. Input/Output operations 4. Error detection 5. Resource allocation 6. Accounting 7. protection ...
virtual machine
... • Accounting – To keep track of which users use how much and what kinds of computer resources • Protection and security – Protection • ensuring that all access to system resources is controlled ...
... • Accounting – To keep track of which users use how much and what kinds of computer resources • Protection and security – Protection • ensuring that all access to system resources is controlled ...
System Call - ShareCourse
... Apple Mac OS X as “Aqua” GUI interface with UNIX kernel underneath and shells available ...
... Apple Mac OS X as “Aqua” GUI interface with UNIX kernel underneath and shells available ...
UNIX Operating System
... scanners faster and more flexibly than previous interfaces. Developed at Apple Computer and still used in the Macintosh, the present set of SCSIs are parallel interfaces. SCSI ports continue to be built into many personal computers today and are supported by all major operating systems. ...
... scanners faster and more flexibly than previous interfaces. Developed at Apple Computer and still used in the Macintosh, the present set of SCSIs are parallel interfaces. SCSI ports continue to be built into many personal computers today and are supported by all major operating systems. ...
Operating-System Structures - Stanford Computer Graphics
... Since main memory (primary storage) is volatile and too ...
... Since main memory (primary storage) is volatile and too ...
Operating Systems I
... A control program the manages all the resources of the computer on which it runs. ...
... A control program the manages all the resources of the computer on which it runs. ...
L03_Processes
... operating system is divided into a number of layers or levels, each built on top of lower layers. The lowest layer is the hardware; the highest is the user interface. Layers are selected such that each uses functions and services of only lower-level layers. ...
... operating system is divided into a number of layers or levels, each built on top of lower layers. The lowest layer is the hardware; the highest is the user interface. Layers are selected such that each uses functions and services of only lower-level layers. ...
Operating Systems CMPSC 473
... • OS competes with the processes for resources – E.g., OS uses disk to swap ...
... • OS competes with the processes for resources – E.g., OS uses disk to swap ...
Berkeley Software Distribution
Berkeley Software Distribution (BSD) is a Unix operating system derivative developed and distributed by the Computer Systems Research Group (CSRG) of the University of California, Berkeley, from 1977 to 1995. Today the term ""BSD"" is often used non-specifically to refer to any of the BSD descendants which together form a branch of the family of Unix-like operating systems. Operating systems derived from the original BSD code remain actively developed and widely used.Historically, BSD has been considered a branch of Unix, Berkeley Unix, because it shared the initial codebase and design with the original AT&T Unix operating system. In the 1980s, BSD was widely adopted by vendors of workstation-class systems in the form of proprietary Unix variants such as DEC ULTRIX and Sun Microsystems SunOS. This can be attributed to the ease with which it could be licensed, and the familiarity the founders of many technology companies of the time had with it.Although these proprietary BSD derivatives were largely superseded by the UNIX System V Release 4 and OSF/1 systems in the 1990s (both of which incorporated BSD code and are the basis of other modern Unix systems), later BSD releases provided a basis for several open source development projects, e.g. FreeBSD, OpenBSD, NetBSD, Darwin or PC-BSD, that are ongoing. These, in turn, have been incorporated in whole or in part in modern proprietary operating systems, e.g. the TCP/IP networking code in Windows NT 3.1 and most of the foundation of Apple's OS X and iOS.