Scheduling
... and then selecting another in a round-robin fashion. Works if processes are compute-bound. What if a process gives up some of its 10 ms to wait for input? How long should the quantum be? is 10 msec the right answer? Shorter quantum => better interactive performance, but lowers overall system through ...
... and then selecting another in a round-robin fashion. Works if processes are compute-bound. What if a process gives up some of its 10 ms to wait for input? How long should the quantum be? is 10 msec the right answer? Shorter quantum => better interactive performance, but lowers overall system through ...
Figure 15.1 A distributed multimedia system
... privileged for the physical resources on its host computer A kernel process execute with the processor in supervisor (privileged) mode; the kernel arranges that other processes execute in user (unprivileged) mode A kernel also sets up address spaces to protect itself and other processes from the ...
... privileged for the physical resources on its host computer A kernel process execute with the processor in supervisor (privileged) mode; the kernel arranges that other processes execute in user (unprivileged) mode A kernel also sets up address spaces to protect itself and other processes from the ...
(IT) - Sem - III - Modern Operating System
... failed machine can remain down, but the users and clients of the application would only see a brief interruption of the service. In asymmetric clustering, one machine is in hot standby mode while the other is running the applications. The hot standby host (machine) does nothing but monitor the activ ...
... failed machine can remain down, but the users and clients of the application would only see a brief interruption of the service. In asymmetric clustering, one machine is in hot standby mode while the other is running the applications. The hot standby host (machine) does nothing but monitor the activ ...
Process
... Child has exceeded its usage of some resources Task assigned to child is no longer required Parent is exiting and OS does not allow child to continue without ...
... Child has exceeded its usage of some resources Task assigned to child is no longer required Parent is exiting and OS does not allow child to continue without ...
Operating System Theory Guide to Operating Systems
... – MS-DOS was still text-based – Managed the computer memory closely for the software ...
... – MS-DOS was still text-based – Managed the computer memory closely for the software ...
Operating Systems, 082
... Running user commands User types: ‘grep some_word file_name’ Shell parses the command, inserts the strings grep, some_word, file_name into argv and their number to argc Next, the shell uses fork() to create a process (same user ID) Now, it takes the executable name grep and the arguments, a ...
... Running user commands User types: ‘grep some_word file_name’ Shell parses the command, inserts the strings grep, some_word, file_name into argv and their number to argc Next, the shell uses fork() to create a process (same user ID) Now, it takes the executable name grep and the arguments, a ...
... these questions is “yes” because Linux provides system developers with a great deal of control over their computing environments. Linux – Use the source! Perhaps one of the best features of the Linux operating system is that it is available with source code. The Linux kernel source code is freely av ...
Comparison of Amoeba Vs Mach Operating Systems
... running on the DEC VAX computer family, including multiprocessor versions of the VAX. Versions for the IBM RT/PC and for SUN 3 workstations followed shortly. 1987 saw the completion of the Encore Multimax and Sequent Balance multiprocessor versions, including task and thread support, as well as the ...
... running on the DEC VAX computer family, including multiprocessor versions of the VAX. Versions for the IBM RT/PC and for SUN 3 workstations followed shortly. 1987 saw the completion of the Encore Multimax and Sequent Balance multiprocessor versions, including task and thread support, as well as the ...
ppt
... Avoid for example worry about multiple threads changing data as reads / writes occurring ...
... Avoid for example worry about multiple threads changing data as reads / writes occurring ...
Chapter 13: I/O Systems
... Avoid for example worry about multiple threads changing data as reads / writes occurring ...
... Avoid for example worry about multiple threads changing data as reads / writes occurring ...
Introduction - Department of Computer Engineering
... • Services are specified through interfaces, described in IDL (Interface Definition Language) • Interoperability: two implementations of a system to co-exist and work together. • Portability: An application developed to work on A can be executed on another system B. • Separating policy from mechanis ...
... • Services are specified through interfaces, described in IDL (Interface Definition Language) • Interoperability: two implementations of a system to co-exist and work together. • Portability: An application developed to work on A can be executed on another system B. • Separating policy from mechanis ...
threads
... Difficulty: in cases where resources have been allocated to a canceled thread or where a thread is canceled while in the midst of updating data it is sharing with other threads ...
... Difficulty: in cases where resources have been allocated to a canceled thread or where a thread is canceled while in the midst of updating data it is sharing with other threads ...
Document
... Requesti = request vector for process Pi. If Requesti [j] = k then process Pi wants k instances of resource type Rj 1. If Requesti Needi, go to step 2. Otherwise, raise error condition, since process has exceeded its maximum claim 2. If Requesti Available, go to step 3. Otherwise Pi must wait, s ...
... Requesti = request vector for process Pi. If Requesti [j] = k then process Pi wants k instances of resource type Rj 1. If Requesti Needi, go to step 2. Otherwise, raise error condition, since process has exceeded its maximum claim 2. If Requesti Available, go to step 3. Otherwise Pi must wait, s ...
ch2
... Accounting - To keep track of which users use how much and what kinds of computer resources 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 othe ...
... Accounting - To keep track of which users use how much and what kinds of computer resources 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 othe ...
M.C.A.(Sem - V) Distributed Computing
... 1. How does the system find an idle workstation? 2. How is a process transferred from one workstation to get it executed on another workstation? 3. What happens to a remote process if a user logs onto a workstation that was idle until now and was being used to execute a process of another workstatio ...
... 1. How does the system find an idle workstation? 2. How is a process transferred from one workstation to get it executed on another workstation? 3. What happens to a remote process if a user logs onto a workstation that was idle until now and was being used to execute a process of another workstatio ...
Processes and Threads
... Thread creation management is much easier than process creation and management ...
... Thread creation management is much easier than process creation and management ...
Operating-System Debugging
... Booting – starting a computer by loading the kernel Bootstrap program – code stored in ROM that is able to locate the kernel, ...
... Booting – starting a computer by loading the kernel Bootstrap program – code stored in ROM that is able to locate the kernel, ...
Processes
... – Create and initialize the process control block (PCB) in the kernel – Create a new address space – Initialize the address space with a copy of the entire contents of the address space of the parent – Inherit the execution context of the parent (e.g., any open files) – Inform the scheduler that the ...
... – Create and initialize the process control block (PCB) in the kernel – Create a new address space – Initialize the address space with a copy of the entire contents of the address space of the parent – Inherit the execution context of the parent (e.g., any open files) – Inform the scheduler that the ...
Chapter 22 - Windows XP
... processes within a single machine. In particular, it is used to request services from the various XP ...
... processes within a single machine. In particular, it is used to request services from the various XP ...
Microkernels Meet Recursive Virtual Machines
... microkernel architecture. These nesters cause almost no slowdown at all. Other nesters, such as the memory manager and the checkpointer, must interfere more to perform their function, and therefore cause some slowdown. However, even this slowdown is fairly reasonable. Our results indicate that, at l ...
... microkernel architecture. These nesters cause almost no slowdown at all. Other nesters, such as the memory manager and the checkpointer, must interfere more to perform their function, and therefore cause some slowdown. However, even this slowdown is fairly reasonable. Our results indicate that, at l ...
VirtuOS: an operating system with kernel virtualization
... failures caused by software errors and transient hardware faults. Such hardware faults include invalid DMA memory accesses or interrupt signaling errors. Service domain failures can be contained as long as the hypervisor itself enforces isolation. We designed all communication between the primary do ...
... failures caused by software errors and transient hardware faults. Such hardware faults include invalid DMA memory accesses or interrupt signaling errors. Service domain failures can be contained as long as the hypervisor itself enforces isolation. We designed all communication between the primary do ...
Lecture 1: Course Introduction and Overview
... • Can OS be encoded in ROM/Flash ROM? • Does OS have to be software? – Can it be Hardware? – Custom Chip with predefined behavior – Are these even OSs? ...
... • Can OS be encoded in ROM/Flash ROM? • Does OS have to be software? – Can it be Hardware? – Custom Chip with predefined behavior – Are these even OSs? ...
Lessons Learned from 30 Years of MINIX,
... MINIX, I was extremely sensitive to any bugs or flaws that turned up. All developers should try to use their own systems as early as feasible so they can see what users will experience. Lesson. Eat your own dog food. The microkernel was indeed small. Only the scheduler, low-level process management, ...
... MINIX, I was extremely sensitive to any bugs or flaws that turned up. All developers should try to use their own systems as early as feasible so they can see what users will experience. Lesson. Eat your own dog food. The microkernel was indeed small. Only the scheduler, low-level process management, ...
Pilot: An Operating System for a Personal Computer
... represent the media on which files are stored (e.g., magnetic disks). Higher level software is expected to superimpose further structure on files and volumes as necessary (e.g., an executable subsystem on a file, or a detachable directory subtree on a removable volume). The emphasis at the Pilot lev ...
... represent the media on which files are stored (e.g., magnetic disks). Higher level software is expected to superimpose further structure on files and volumes as necessary (e.g., an executable subsystem on a file, or a detachable directory subtree on a removable volume). The emphasis at the Pilot lev ...
Plan 9 from Bell Labs
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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.