CS420: Operating Systems Multiprocessor Scheduling
... - Because the cores are all the same, any available processor can be allocated to any process in the system ...
... - Because the cores are all the same, any available processor can be allocated to any process in the system ...
Process Control Management
... • non-preemptive scheduling: - processes releases the CPU only after completion - processes releases CPU voluntarily - non-preemptive scheduling algorithms: - first come first serve or first in first out ...
... • non-preemptive scheduling: - processes releases the CPU only after completion - processes releases CPU voluntarily - non-preemptive scheduling algorithms: - first come first serve or first in first out ...
Processes and Process Control Blocks
... instructions that execute for that process. Such a listing is referred to as a trace of the process. We can characterize behavior of the processor by showing how the traces of the various processes are interleaved. A small dispatcher program is used to switch the processor from one process to ...
... instructions that execute for that process. Such a listing is referred to as a trace of the process. We can characterize behavior of the processor by showing how the traces of the various processes are interleaved. A small dispatcher program is used to switch the processor from one process to ...
2.01
... 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, ...
Operating System Structures - McMaster Computing and Software
... Programming-language support - Compilers, assemblers, debuggers and interpreters sometimes provided Program loading and execution- Absolute loaders, relocatable loaders, linkage editors, and overlay-loaders, debugging systems for higher-level and machine language Communications - Provide the m ...
... Programming-language support - Compilers, assemblers, debuggers and interpreters sometimes provided Program loading and execution- Absolute loaders, relocatable loaders, linkage editors, and overlay-loaders, debugging systems for higher-level and machine language Communications - Provide the m ...
process management commands
... 2. An inter-process communication channel (IPC) is required to pass information between a parent process and its children processes. These problems can be overcome by using threads. ...
... 2. An inter-process communication channel (IPC) is required to pass information between a parent process and its children processes. These problems can be overcome by using threads. ...
10CSE
... Service time = total processor time needed in one (CPU-I/O) cycle Jobs with long service time are CPU-bound jobs and are referred to as “long jobs” ...
... Service time = total processor time needed in one (CPU-I/O) cycle Jobs with long service time are CPU-bound jobs and are referred to as “long jobs” ...
I/O and Storage Management
... The OS tries to support as many of these dimensions as possible for each device The semantics are specified in the open() system call ...
... The OS tries to support as many of these dimensions as possible for each device The semantics are specified in the open() system call ...
Operating Systems: Processes and Threads Process model
... One physical program counter switches between processes Conceptual model of 4 independent, sequential processes Only one program active at any instant on one CPU ...
... One physical program counter switches between processes Conceptual model of 4 independent, sequential processes Only one program active at any instant on one CPU ...
Operating System Services
... File-system manipulation - The file system is of particular interest. Obviously, programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
... File-system manipulation - The file system is of particular interest. Obviously, programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
Application Software Read/Write Standard Output Device Control
... Copyright ©: University of Illinois CS 241 Staff ...
... Copyright ©: University of Illinois CS 241 Staff ...
Chapter 3 Operating Systems
... • A collection of programs that manages resources of a computer, such as - processors - memory - input/output devices • ... like the conductor of an orchestra. • A virtual machine that lets a user accomplish tasks that would be difficult to perform directly with the underlying actual machine. - graph ...
... • A collection of programs that manages resources of a computer, such as - processors - memory - input/output devices • ... like the conductor of an orchestra. • A virtual machine that lets a user accomplish tasks that would be difficult to perform directly with the underlying actual machine. - graph ...
from Plan BeII Labs .
... 19861, where a new application typically creates a new window to run in, an Stfz graphics application usually runs in the window where it starts. It is possible and efficient for an application to create a new window, but that is not the style of the system. Again contrasting to X, in which a remote ...
... 19861, where a new application typically creates a new window to run in, an Stfz graphics application usually runs in the window where it starts. It is possible and efficient for an application to create a new window, but that is not the style of the system. Again contrasting to X, in which a remote ...
lecture 9
... to maximize CPU utilization. In a uniprocessor system, only one process may run at a time; any other processes much wait until the CPU is free and can be rescheduled. In multiprogramming, a process is executed until it must wait, typically for the completion of some I/O request. In a simple computer ...
... to maximize CPU utilization. In a uniprocessor system, only one process may run at a time; any other processes much wait until the CPU is free and can be rescheduled. In multiprogramming, a process is executed until it must wait, typically for the completion of some I/O request. In a simple computer ...
A User Mode L4 Environment
... Availability: Linux machines are available almost everywhere. In a new environment, it is sometimes difficult or for security reasons not allowed to change the operating system of machines connected to the internal network. Hence, an L4 or L4 Linux machine is not available. New Platforms: A port of ...
... Availability: Linux machines are available almost everywhere. In a new environment, it is sometimes difficult or for security reasons not allowed to change the operating system of machines connected to the internal network. Hence, an L4 or L4 Linux machine is not available. New Platforms: A port of ...
lect_3
... A single user system, such as MS windows, a user may able to run several programs at one time, such as MS-word, a web browser, and an email. All these activities are called processes. The terms job and process are used interchangeably ...
... A single user system, such as MS windows, a user may able to run several programs at one time, such as MS-word, a web browser, and an email. All these activities are called processes. The terms job and process are used interchangeably ...
module_23
... Resource-Request Algorithm for Process Pi 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 Availa ...
... Resource-Request Algorithm for Process Pi 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 Availa ...
1999 - 2000
... That is, the computer could give the illusion of running more than one task at a time. Being able to do this allowed the CPU to be used much more effectively. When one job had to wait for an I/O request, another program could use the CPU. The concept of multiprogramming led to a need for a more comp ...
... That is, the computer could give the illusion of running more than one task at a time. Being able to do this allowed the CPU to be used much more effectively. When one job had to wait for an I/O request, another program could use the CPU. The concept of multiprogramming led to a need for a more comp ...
os3-2_pro
... • Long-term scheduler is invoked very infrequently (seconds, minutes) (may be slow). • The long-term scheduler controls the degree of ...
... • Long-term scheduler is invoked very infrequently (seconds, minutes) (may be slow). • The long-term scheduler controls the degree of ...
The Sprite Network Operating System
... In an environment with a workstation for each person, many of the machines will be idle at any given time. In order to allow users to harness this idle computing power, Sprite provides a new kernel call, Proc_Migrate, which will move a process or group of processes to an idle machine. Processes shar ...
... In an environment with a workstation for each person, many of the machines will be idle at any given time. In order to allow users to harness this idle computing power, Sprite provides a new kernel call, Proc_Migrate, which will move a process or group of processes to an idle machine. Processes shar ...
Document
... Handles the working of application programs with the hardware and other software systems Manages the storage and retrieval of information using storage devices such disks There are many operating systems developed during the last few decades but the popular among them are MS-DOS, Windows 2000, Windo ...
... Handles the working of application programs with the hardware and other software systems Manages the storage and retrieval of information using storage devices such disks There are many operating systems developed during the last few decades but the popular among them are MS-DOS, Windows 2000, Windo ...
Preface
... understanding of operating systems are covered in Chapter 1. In that chapter, we also include an overview of the fundamental data structures that are prevalent in most operating systems. For code examples, we use predominantly C, with some Java, but the reader can still understand the algorithms wit ...
... understanding of operating systems are covered in Chapter 1. In that chapter, we also include an overview of the fundamental data structures that are prevalent in most operating systems. For code examples, we use predominantly C, with some Java, but the reader can still understand the algorithms wit ...
CS3161 Operating System Principles
... Process represents a program (application) executing on a computer system. Process management involves in keep track of process execution status and to share out processor resource (fairly and efficiently). ...
... Process represents a program (application) executing on a computer system. Process management involves in keep track of process execution status and to share out processor resource (fairly and efficiently). ...
scheduling
... Robin Scheduling is very large? And what happens if the time allocated is very low? Ans: It results in a FCFS scheduling, that means Scheduler selects the process at the head of the ...
... Robin Scheduling is very large? And what happens if the time allocated is very low? Ans: It results in a FCFS scheduling, that means Scheduler selects the process at the head of the ...