Lecture 1 - The Laboratory for Advanced Systems Research
... • For example, why do we want all printers to look the same? – So we could write applications against a single model, and have it “just work” with all printers ...
... • For example, why do we want all printers to look the same? – So we could write applications against a single model, and have it “just work” with all printers ...
Figure 15.1 A distributed multimedia system
... multiple shared whiteboards with one thread each. Each object has only one thread, avoiding the need for thread synchronization within objects. ...
... multiple shared whiteboards with one thread each. Each object has only one thread, avoiding the need for thread synchronization within objects. ...
Operating Systems
... the threads take turns running. All threads have exactly the same address space, which means that they also share the same global variables. Since every thread can access every memory address within the process’ address space, one thread can read, write, or even completely wipe out another threa ...
... the threads take turns running. All threads have exactly the same address space, which means that they also share the same global variables. Since every thread can access every memory address within the process’ address space, one thread can read, write, or even completely wipe out another threa ...
OPERATING- SYSTEM CONCEPTS with Java
... d. Real time. Often used in a dedicated application, this system reads information from sensors and must respond within a fixed amount of time to ensure correct performance. e. Network. Provides operating system features across a network such as file sharing. f. SMP. Used in systems where there are ...
... d. Real time. Often used in a dedicated application, this system reads information from sensors and must respond within a fixed amount of time to ensure correct performance. e. Network. Provides operating system features across a network such as file sharing. f. SMP. Used in systems where there are ...
3.5 Interprocess Communication
... – All processes are provided with a set of memory addresses, called a virtual address space – A process’s PCB is maintained by the kernel in a protected region of memory that user processes cannot access – A UNIX PCB stores: • The contents of the processor registers ...
... – All processes are provided with a set of memory addresses, called a virtual address space – A process’s PCB is maintained by the kernel in a protected region of memory that user processes cannot access – A UNIX PCB stores: • The contents of the processor registers ...
Multiuser Systems
... Each computer system includes a basic set of programs called the operating system. The most important program in the set is called the kernel. It is loaded into RAM when the system boots and contains many critical procedures that are needed for the system to operate. The other programs are less cruc ...
... Each computer system includes a basic set of programs called the operating system. The most important program in the set is called the kernel. It is loaded into RAM when the system boots and contains many critical procedures that are needed for the system to operate. The other programs are less cruc ...
Lecture Notes- Operating Systems
... o I/O operations - A running program may require I/O, which may involve a file or an I/O device o File-system manipulation - The file system is of particular interest. Programs need to read and write files and directories, create and delete them, search them, list file Information, permission manage ...
... o I/O operations - A running program may require I/O, which may involve a file or an I/O device o File-system manipulation - The file system is of particular interest. Programs need to read and write files and directories, create and delete them, search them, list file Information, permission manage ...
What is an Operating System?
... User identities (user IDs, security IDs) include name and associated number, one per user User ID then associated with all files, processes of that user to determine access control Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with eac ...
... User identities (user IDs, security IDs) include name and associated number, one per user User ID then associated with all files, processes of that user to determine access control Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with eac ...
Module 4: Processes
... I/O-bound process – spends more time doing I/O than computations, many short CPU bursts CPU-bound process – spends more time doing computations; few very long CPU bursts ...
... I/O-bound process – spends more time doing I/O than computations, many short CPU bursts CPU-bound process – spends more time doing computations; few very long CPU bursts ...
ch13
... Discuss the principles of I/O hardware and its complexity Provide details of the performance aspects of I/O hardware and ...
... Discuss the principles of I/O hardware and its complexity Provide details of the performance aspects of I/O hardware and ...
Operating System Extensions to Support Host Based Virtual Machines
... the power of the underling memory management haware are known to contribute to this performance degradation. In an effort to improve performance, I developed two new abstractions: KTrace and memory management abstractions (MMA). KTrace is a mechanism through which kernel modules can register callbac ...
... the power of the underling memory management haware are known to contribute to this performance degradation. In an effort to improve performance, I developed two new abstractions: KTrace and memory management abstractions (MMA). KTrace is a mechanism through which kernel modules can register callbac ...
Lecture 8: Operating Systems Structures
... » Everyone in group must have logged into their cs162-xx accounts once before you register the group » Make sure that you select at least 2 potential sections » Due tomorrow: Thursday 9/4 by 11:59pm ...
... » Everyone in group must have logged into their cs162-xx accounts once before you register the group » Make sure that you select at least 2 potential sections » Due tomorrow: Thursday 9/4 by 11:59pm ...
Transparent Process Migration: Design Alternatives and the Sprite Implementation
... except for eviction. Instead, a few application programs such as pmake identify longrunning processes (perhaps with user assistance) and arrange for them to be migrated to idle machines. When users return to their machines, a system program automatically evicts any processes that had been migrated o ...
... except for eviction. Instead, a few application programs such as pmake identify longrunning processes (perhaps with user assistance) and arrange for them to be migrated to idle machines. When users return to their machines, a system program automatically evicts any processes that had been migrated o ...
O ti S t O ti S t Operating Systems Chapter 1
... This module covers the core concepts of modern operating systems, and provides contextual application of theory, using examples of currently used operating system environments. ...
... This module covers the core concepts of modern operating systems, and provides contextual application of theory, using examples of currently used operating system environments. ...
Figure 5.01 - College of the Holy Cross
... Threads are faster to create and faster to switch between. Utilization of Multiprocessor Architectures: Threads can run in parallel on different processors. A single threaded process can run only on one processor no matter how many are available. Operating System Concepts ...
... Threads are faster to create and faster to switch between. Utilization of Multiprocessor Architectures: Threads can run in parallel on different processors. A single threaded process can run only on one processor no matter how many are available. Operating System Concepts ...
Concepts in Real-Time Operating Systems
... hardware clock into the address space of applications. An application can then read the hardware clock directly (through a normal memory read operation) without having to make a system call. On a Pentium processor, a user thread can be made to read the Pentium time stamp counter. This counter starts ...
... hardware clock into the address space of applications. An application can then read the hardware clock directly (through a normal memory read operation) without having to make a system call. On a Pentium processor, a user thread can be made to read the Pentium time stamp counter. This counter starts ...
The Operating System is the Control Plane - Arrakis
... access to hardware devices. Nevertheless, most web services are still built as applications on top of a traditional kernel, because exchanging reliability for better performance is rarely a good tradeoff. Our goal is to provide the best of both worlds. Taking a cue from very high speed Internet rout ...
... access to hardware devices. Nevertheless, most web services are still built as applications on top of a traditional kernel, because exchanging reliability for better performance is rarely a good tradeoff. Our goal is to provide the best of both worlds. Taking a cue from very high speed Internet rout ...
Processes - Computer and Information Science
... Message system – processes communicate with each other without resorting to shared variables IPC facility provides two operations: send(message) – message size fixed or variable ...
... Message system – processes communicate with each other without resorting to shared variables IPC facility provides two operations: send(message) – message size fixed or variable ...
Operating System Layer
... Assume for the sake of simplicity that the pages belonging to region A are resident in memory. Initially, all page frames associated with the regions are shared between the two processes’ page tables. The pages are initially write-protected at the hardware level, even though they may belong to regio ...
... Assume for the sake of simplicity that the pages belonging to region A are resident in memory. Initially, all page frames associated with the regions are shared between the two processes’ page tables. The pages are initially write-protected at the hardware level, even though they may belong to regio ...
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.