The Styx Architecture for Distributed Systems
... A distributed system is constructed from a set of relatively independent components that form a unified, but geographically and functionally diverse entity. Examples include networked operating systems, Internet services, the national telephone switching system, and in general all the technology usi ...
... A distributed system is constructed from a set of relatively independent components that form a unified, but geographically and functionally diverse entity. Examples include networked operating systems, Internet services, the national telephone switching system, and in general all the technology usi ...
Chapter 2 Operating
... 2.3 System Calls System calls provide an interface to the services made available by an operating system. These calls are generally available as routines written in C and C++, although certain low level tasks (for example, tasks where hardware must be accessed directly), may need to be written using ...
... 2.3 System Calls System calls provide an interface to the services made available by an operating system. These calls are generally available as routines written in C and C++, although certain low level tasks (for example, tasks where hardware must be accessed directly), may need to be written using ...
Enhanced Guide to Managing & Maintaining Your PC, 3e
... primary memory (RAM) and secondary storage? How many and what kinds of applications are written to work with the OS? How powerful must the hardware be to make efficient use of the OS? How does the OS perform in a network? ...
... primary memory (RAM) and secondary storage? How many and what kinds of applications are written to work with the OS? How powerful must the hardware be to make efficient use of the OS? How does the OS perform in a network? ...
Booting and Shutting Down UNIX Flavored Operating Systems
... – halt: Performs essential duties required to bring the system down, waits for the filesystem writes to complete then halts the kernel. – reboot: Executes identically to halt with the excepting that it causes to system to restart from scratch rather than halting the kernel. – kill init: This is not ...
... – halt: Performs essential duties required to bring the system down, waits for the filesystem writes to complete then halts the kernel. – reboot: Executes identically to halt with the excepting that it causes to system to restart from scratch rather than halting the kernel. – kill init: This is not ...
Distribution…
... The general organization of an Internet search engine into three different layers (we can have this organization on two or more physically distributed machines) ...
... The general organization of an Internet search engine into three different layers (we can have this organization on two or more physically distributed machines) ...
Operating System
... • Distribute the computation among several physical computers. – Each has its own CPU, local memory, stable storage, I/O paths connecting to the environment ...
... • Distribute the computation among several physical computers. – Each has its own CPU, local memory, stable storage, I/O paths connecting to the environment ...
Underlying computer system = hardware + software
... CPU stores the next few instructions in a cache – much faster to access than memory – Similarly stores data used by the instructions in a data cache – For even faster access, the CPU stores some data values and addresses in registers (fewer in number than cache entries and even faster to access than ...
... CPU stores the next few instructions in a cache – much faster to access than memory – Similarly stores data used by the instructions in a data cache – For even faster access, the CPU stores some data values and addresses in registers (fewer in number than cache entries and even faster to access than ...
1.1. The UNIX Operating System
... disks, modems, printers, network cards etc.) in a safe, efficient and abstract way. For example, an OS ensures safe access to a printer by allowing only one application program to send data directly to the printer at any one time. An OS encourages efficient use of the CPU by suspending programs that ...
... disks, modems, printers, network cards etc.) in a safe, efficient and abstract way. For example, an OS ensures safe access to a printer by allowing only one application program to send data directly to the printer at any one time. An OS encourages efficient use of the CPU by suspending programs that ...
Operating System Concepts, Terminology, and History
... operating system to be the supporting software structure on which application programs run. – This support structure includes the facilities to manage the computer system's resources and any utility programs needed to maintain and configure the operating system. • The heart of system administration ...
... operating system to be the supporting software structure on which application programs run. – This support structure includes the facilities to manage the computer system's resources and any utility programs needed to maintain and configure the operating system. • The heart of system administration ...
over view of operating system
... Error detection – OS needs to be constantly aware of possible errors May occur in the CPU and memory hardware, in I/O devices, in user program For each type of error, OS should take the appropriate action to ensure correct and consistent computing Debugging facilities can greatly enhance the us ...
... Error detection – OS needs to be constantly aware of possible errors May occur in the CPU and memory hardware, in I/O devices, in user program For each type of error, OS should take the appropriate action to ensure correct and consistent computing Debugging facilities can greatly enhance the us ...
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. ...
Page table
... ◦ Temporary record of all metadata updates ◦ Name of volume, NTFS version, consistency bit ◦ Types of attributes used in volume & operations on types ...
... ◦ Temporary record of all metadata updates ◦ Name of volume, NTFS version, consistency bit ◦ Types of attributes used in volume & operations on types ...
Week 2 _Operating system File
... The layered approach is less efficient than the other approaches. While executing a system call each layer adds overhead to the system call. ...
... The layered approach is less efficient than the other approaches. While executing a system call each layer adds overhead to the system call. ...
Implementation of Log Based File Systems on Open Source
... large-scale Cray supercomputers to the booming market of Palm Pilots, each type of computer has its own set of advantages and disadvantages. Likewise, computing components, both physical components and software components, have similar sets of advantages and disadvantages One area of research is the ...
... large-scale Cray supercomputers to the booming market of Palm Pilots, each type of computer has its own set of advantages and disadvantages. Likewise, computing components, both physical components and software components, have similar sets of advantages and disadvantages One area of research is the ...
Unix and shell programming
... The UNIX operating system is a set of programs that act as a link between the computer and the user. The computer programs that allocate the system resources and coordinate all the details of the computer's internals is called the operating system or kernel. Users communicates with the kernel ...
... The UNIX operating system is a set of programs that act as a link between the computer and the user. The computer programs that allocate the system resources and coordinate all the details of the computer's internals is called the operating system or kernel. Users communicates with the kernel ...
Overview of Operating Systems
... ❚ UNIX – limited by hardware functionality, the original UNIX operating system had limited structure. ❚ The UNIX OS consists of two separable parts: Ø Application programs Ø The kernel (everything below the system-call interface and above the physical hardware) ü Provides the file system, CPU s ...
... ❚ UNIX – limited by hardware functionality, the original UNIX operating system had limited structure. ❚ The UNIX OS consists of two separable parts: Ø Application programs Ø The kernel (everything below the system-call interface and above the physical hardware) ü Provides the file system, CPU s ...
CL02_Operating_Systems
... Allows you to communicate with the computer (tell it what to do) Controls access (login) to the computer Keeps track of all processes currently running ...
... Allows you to communicate with the computer (tell it what to do) Controls access (login) to the computer Keeps track of all processes currently running ...
Operating System Structures
... • Services that operating system provides to programs • Program execution (loading into memory and starting) • I/O operations — because programs can not usually access peripheral devices directly, operating system must offer services for it • File system manipulation — file creation, deletion, readi ...
... • Services that operating system provides to programs • Program execution (loading into memory and starting) • I/O operations — because programs can not usually access peripheral devices directly, operating system must offer services for it • File system manipulation — file creation, deletion, readi ...
OPERATING SYSTEMS DESIGN AND IMPLEMENTATION Third
... Feature/Kernel type Modularity Flexibility Maintainability Security Compatibility Performance ...
... Feature/Kernel type Modularity Flexibility Maintainability Security Compatibility Performance ...
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. ...
Lecture 1 - Concepts of the UNIX Operating System
... NOTES: 1. Many UNIX commands (called filters) possess an unusual property in that the output of one command can be connected to the input of another. In this way, pipelines of two or more commands can be set up to handle complex text manipulation tasks. You can’t have a pipeline of interactive comma ...
... NOTES: 1. Many UNIX commands (called filters) possess an unusual property in that the output of one command can be connected to the input of another. In this way, pipelines of two or more commands can be set up to handle complex text manipulation tasks. You can’t have a pipeline of interactive comma ...
Plan 9 from Bell Labs
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.