What is an Operating System?
... On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control statement” from the user’s keyboard. On-line system must be available for users to access data and code. ...
... On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control statement” from the user’s keyboard. On-line system must be available for users to access data and code. ...
Module 4: Processes
... No structure to speak of. As the OS grows, the complexity becomes overwhelming. Example: OS/360 version 1 created by 5000 programmers over 5 years. In 1964, had over 1 million lines of code. Modular systems: Divide OS into modules. Example: Original UNIX had 2 modules. System program ...
... No structure to speak of. As the OS grows, the complexity becomes overwhelming. Example: OS/360 version 1 created by 5000 programmers over 5 years. In 1964, had over 1 million lines of code. Modular systems: Divide OS into modules. Example: Original UNIX had 2 modules. System program ...
hw1_wet
... below. You should use VMware to simulate a virtual machine on which you compile and run your "modified" Linux. ...
... below. You should use VMware to simulate a virtual machine on which you compile and run your "modified" Linux. ...
BackDoors
... Some intruders knew the administrator was checking the login program for tampering, so they modified in.telnetd. Within in.telnetd, it does several checks from the user for things like what kind of terminal the user was using. Typically, the terminal setting might be xterm or VT100. An intruder coul ...
... Some intruders knew the administrator was checking the login program for tampering, so they modified in.telnetd. Within in.telnetd, it does several checks from the user for things like what kind of terminal the user was using. Typically, the terminal setting might be xterm or VT100. An intruder coul ...
Into to Linux Part 1-4
... processor, the on-board memory, the disk drives, keyboards, video monitors, etc. to perform useful tasks ...
... processor, the on-board memory, the disk drives, keyboards, video monitors, etc. to perform useful tasks ...
ch02-OS-Structures
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure ...
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure ...
csci19f2
... • Raid level 2 requires synchronized drives • Reading is very fast as all drives can transfer data (portions of the file). In one sector reading time n (number of drives) sectors are read in • Writing is slower because of parity information (to write parity all requests must access this drive) CS19D ...
... • Raid level 2 requires synchronized drives • Reading is very fast as all drives can transfer data (portions of the file). In one sector reading time n (number of drives) sectors are read in • Writing is slower because of parity information (to write parity all requests must access this drive) CS19D ...
The Kaya OS project and the µMPS Hardware Simulator
... widespread use. Even for those with many years of experience teaching operating systems, the creation of the necessary accompanying curricular materials, in essence the design of a complete though unsophisticated operating system broken down into a series of realistically appropriate student assignm ...
... widespread use. Even for those with many years of experience teaching operating systems, the creation of the necessary accompanying curricular materials, in essence the design of a complete though unsophisticated operating system broken down into a series of realistically appropriate student assignm ...
Embedded Operating Systems Selection Guide
... centralized server. However, thin clients offer the additional advantages of a smaller footprint (offering less surface area for attacks and patching) and image lifecycle (because applications are stored on the server or PC blade, the thin client operating system does not require upgrading). ...
... centralized server. However, thin clients offer the additional advantages of a smaller footprint (offering less surface area for attacks and patching) and image lifecycle (because applications are stored on the server or PC blade, the thin client operating system does not require upgrading). ...
Operating System Architecture and Distributed
... DS-wanted features of an OS – An open DS should make it possible to: • Run only that system software on each computer that is necessary for its particular role in the system architecture: – Avoiding redundant modules on capability-limited devices. – Optimizing the behavior of specific components in ...
... DS-wanted features of an OS – An open DS should make it possible to: • Run only that system software on each computer that is necessary for its particular role in the system architecture: – Avoiding redundant modules on capability-limited devices. – Optimizing the behavior of specific components in ...
Operating Systems for Parallel Processing - Current Activities
... operating system manages the system shared resources used by multiple processes, the process scheduling activity (how processes are allocating on available processors), the communication and synchronization between running processes and so on. Multiprocessors are known as tightly coupled systems and ...
... operating system manages the system shared resources used by multiple processes, the process scheduling activity (how processes are allocating on available processors), the communication and synchronization between running processes and so on. Multiprocessors are known as tightly coupled systems and ...
Chapter 7 Operating Systems and Utility Programs
... What are other program management features of operating systems? multiprocessing Can support two or more processors running programs at same time ...
... What are other program management features of operating systems? multiprocessing Can support two or more processors running programs at same time ...
No Slide Title
... standards. First developed as a small but self-contained kernel in 1991 by Linus Torvalds, with the major design goal of UNIX compatibility. Its history has been one of collaboration by many users from all around the world, corresponding almost exclusively over the Internet. It has been designed to ...
... standards. First developed as a small but self-contained kernel in 1991 by Linus Torvalds, with the major design goal of UNIX compatibility. Its history has been one of collaboration by many users from all around the world, corresponding almost exclusively over the Internet. It has been designed to ...
Slides - Winlab
... Don’t be afraid to break it • It’s very rare that miss-configured software will break the hardware (unless you’re name is Kahn). • As long as your data is intact (and it’s your fault if your data is not backed up to a separate media) you can always reinstall. • Since most Linux software is configur ...
... Don’t be afraid to break it • It’s very rare that miss-configured software will break the hardware (unless you’re name is Kahn). • As long as your data is intact (and it’s your fault if your data is not backed up to a separate media) you can always reinstall. • Since most Linux software is configur ...
Support Notes for SUSE LINUX Enterprise Servers HP Part Number: 5900-0402
... as expected during the installation but will be ignored by the X11 server once the system has been installed. To use the USB mouse in the installed system, remove the file /etc/X11/xorg.conf and restart the X11 server. Note that if this is done, only the USB mouse will function and any iLO 2 vKVM mo ...
... as expected during the installation but will be ignored by the X11 server once the system has been installed. To use the USB mouse in the installed system, remove the file /etc/X11/xorg.conf and restart the X11 server. Note that if this is done, only the USB mouse will function and any iLO 2 vKVM mo ...
Chapter 14
... Displays directories and subdirectories In hierarchical order and indented list Options allow file deletion while tree generated TREE /F • Displays filenames in each directory • Used to delete duplicated file on different directories ...
... Displays directories and subdirectories In hierarchical order and indented list Options allow file deletion while tree generated TREE /F • Displays filenames in each directory • Used to delete duplicated file on different directories ...
Advanced Interactive Executive (AIX) operating system overview
... underlying hardware. We had decided to start with the U N I X system as a base. In view of our requirements, however, we were faced with the question of how best to provide the required enhancements. Two strategies could be followed. One was to rewrite the entire kernel. Although theoretically possi ...
... underlying hardware. We had decided to start with the U N I X system as a base. In view of our requirements, however, we were faced with the question of how best to provide the required enhancements. Two strategies could be followed. One was to rewrite the entire kernel. Although theoretically possi ...
Real-Time Operating Systems Lecture for the Embedded Systems
... To get a service from a provider, the client thread attaches it to the provider’s channel Within the client, this connection is directly mapped to the file descriptor (so RFS can be sent directly to the file descriptor) ...
... To get a service from a provider, the client thread attaches it to the provider’s channel Within the client, this connection is directly mapped to the file descriptor (so RFS can be sent directly to the file descriptor) ...
High Availability Server Supports Dependable Infrastructures
... the latest CPUs and technologies that have been commercialized one after another. Furthermore, although general purpose operating systems were used to operate them, it was necessary to make partial adjustments. These were issues that got in the way of speedy product commercialization. The new ft ser ...
... the latest CPUs and technologies that have been commercialized one after another. Furthermore, although general purpose operating systems were used to operate them, it was necessary to make partial adjustments. These were issues that got in the way of speedy product commercialization. The new ft ser ...
ppt
... • Most IPC implementations perform poorly • Really fast message passing systems are needed to run device drivers and other performance critical components at the user-level. • Result: programmers circumvent IPC, co-locating device drivers in the kernel and defeating the main purpose of the microkern ...
... • Most IPC implementations perform poorly • Really fast message passing systems are needed to run device drivers and other performance critical components at the user-level. • Result: programmers circumvent IPC, co-locating device drivers in the kernel and defeating the main purpose of the microkern ...
ppt
... remotely). Why didn't Mach replace UNIX (and other *nix operating systems)? Currently Mach approach, which can generally be thought as an IPC based operating system, is considered as inherently flawed (according to wikipedia). What can be the main reason for Mach not to be accepted as a successful ...
... remotely). Why didn't Mach replace UNIX (and other *nix operating systems)? Currently Mach approach, which can generally be thought as an IPC based operating system, is considered as inherently flawed (according to wikipedia). What can be the main reason for Mach not to be accepted as a successful ...
Operating System Structures - McMaster Computing and Software
... Shell has no idea how ‘rm’ command is implemented and which system call is used to process the request. ...
... Shell has no idea how ‘rm’ command is implemented and which system call is used to process the request. ...
Operating Systems
... File Fragmentation • Fragmentation occurs when your computer places parts of files over many disks areas or clusters • Fragmentation over time can slow data access (each fragment of a file must be accessed for the entire file to be read), the user may use a defragmentation utility so that the data ...
... File Fragmentation • Fragmentation occurs when your computer places parts of files over many disks areas or clusters • Fragmentation over time can slow data access (each fragment of a file must be accessed for the entire file to be read), the user may use a defragmentation utility so that the data ...
Operating Systems – Processes
... saved and execution state of next process has to be loaded (context is switched.). • Time to save old and load new processes’ execution state is called context-switch time. • This time is overhead; The system does no useful work while switching. Needs to me small. • Time depends on hardware support. ...
... saved and execution state of next process has to be loaded (context is switched.). • Time to save old and load new processes’ execution state is called context-switch time. • This time is overhead; The system does no useful work while switching. Needs to me small. • Time depends on hardware support. ...
Chapter 1: OS overview
... Timesharing (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 ...
... Timesharing (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 ...
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.