I/O Systems - Ubiquitous Computing Lab
... – Without I/O, computers are useless (disembodied brains?) – But… thousands of devices, each slightly different » How can we standardize the interfaces to these devices? ...
... – Without I/O, computers are useless (disembodied brains?) – But… thousands of devices, each slightly different » How can we standardize the interfaces to these devices? ...
VirtuOS: an operating system with kernel virtualization
... Architectural approaches for increasing the reliability of kernel software and reducing the impact of faults often rely on decomposition. Microkernel-based system design moves device drivers and other system critical code from the kernel into separate user space processes. Microkernels have been suc ...
... Architectural approaches for increasing the reliability of kernel software and reducing the impact of faults often rely on decomposition. Microkernel-based system design moves device drivers and other system critical code from the kernel into separate user space processes. Microkernels have been suc ...
Final Review Questions
... Generally, blocking I/O is appropriate when the process will be waiting only for one specific event. Examples include a disk, tape, or keyboard read by an application program. Non-blocking I/O is useful when I/O may come from more than one source and the order of the I/O arrival is not predetermined ...
... Generally, blocking I/O is appropriate when the process will be waiting only for one specific event. Examples include a disk, tape, or keyboard read by an application program. Non-blocking I/O is useful when I/O may come from more than one source and the order of the I/O arrival is not predetermined ...
CS 519: Operating System Theory
... Minor policy questions: Who can create/destroy/suspend processes? How many active processes can each user have? ...
... Minor policy questions: Who can create/destroy/suspend processes? How many active processes can each user have? ...
Figure 15.1 A distributed multimedia system
... • A shared memory region is a region that can be accessed by several processes. • The uses of shared regions include the following: Libraries: Library code can be very large and would waste considerable memory. Kernel: Often the kernel code and data are mapped into every address space at the sam ...
... • A shared memory region is a region that can be accessed by several processes. • The uses of shared regions include the following: Libraries: Library code can be very large and would waste considerable memory. Kernel: Often the kernel code and data are mapped into every address space at the sam ...
CS 519: Operating System Theory
... Minor policy questions: Who can create/destroy/suspend processes? How many active processes can each user have? ...
... Minor policy questions: Who can create/destroy/suspend processes? How many active processes can each user have? ...
LEC1-Intro
... • The shell creates the child process, start it executing on the designated command, but not have the parent wait for the child to terminate • The parent and the child are executing concurrently • The parent prints another prompt to stdout and waits for the user to enter another command line • All p ...
... • The shell creates the child process, start it executing on the designated command, but not have the parent wait for the child to terminate • The parent and the child are executing concurrently • The parent prints another prompt to stdout and waits for the user to enter another command line • All p ...
Chapter 21 - Linux Operating System
... 1. Normal kernel code is nonpreemptible (until 2.4) – when a time interrupt is received while a process is executing a kernel system service routine, the kernel’s need_resched flag is set so that the scheduler will run once the system call has completed and control is about to be returned to user mo ...
... 1. Normal kernel code is nonpreemptible (until 2.4) – when a time interrupt is received while a process is executing a kernel system service routine, the kernel’s need_resched flag is set so that the scheduler will run once the system call has completed and control is about to be returned to user mo ...
ErgoSoft RIP recommended System configuration
... is recommended to have a high tact frequency on the individual processor cores rather than a large amount of cores, as the RIP-Server process profits most from a high performing individual core. It is possible to configure the RIP-Server so it uses multiple cores, and certain processes such as Dithe ...
... is recommended to have a high tact frequency on the individual processor cores rather than a large amount of cores, as the RIP-Server process profits most from a high performing individual core. It is possible to configure the RIP-Server so it uses multiple cores, and certain processes such as Dithe ...
What is an Operating System?
... • Memory management is key to multiprogramming • Memory is a space sharing resource • Memory management is necessary to protect co-residing programs from each other • Depending on the occupancy pattern, a program would not know the location until load time ...
... • Memory management is key to multiprogramming • Memory is a space sharing resource • Memory management is necessary to protect co-residing programs from each other • Depending on the occupancy pattern, a program would not know the location until load time ...
Operating system structures
... System call – request to the operating system to allow user to wait for I/O completion. Device-status table contains entry for each I/O device indicating its type, address, and state. Operating system indexes into I/O device table to determine device status and to modify table entry to include ...
... System call – request to the operating system to allow user to wait for I/O completion. Device-status table contains entry for each I/O device indicating its type, address, and state. Operating system indexes into I/O device table to determine device status and to modify table entry to include ...
Sync in an NFV World
... What Else Makes Software Less Deterministic? 1) Memory access times vary depending on type cache, static, dynamic, virtual, etc. ...
... What Else Makes Software Less Deterministic? 1) Memory access times vary depending on type cache, static, dynamic, virtual, etc. ...
Chapter 4 - John Rouda
... • Job Scheduler (JS) or Process Scheduler (PS) incurs state transition responsibility (continued) – WAITING to READY • PS initiates by signal from I/O device manager • Signal indicates I/O request satisfied; job continues ...
... • Job Scheduler (JS) or Process Scheduler (PS) incurs state transition responsibility (continued) – WAITING to READY • PS initiates by signal from I/O device manager • Signal indicates I/O request satisfied; job continues ...
Interrupts and interrupt handlers - Washington University in St. Louis
... Register new handlers with request_irq(), three key attributes: – IRQ number – IRQ handler function – Whether the IRQ is shared ...
... Register new handlers with request_irq(), three key attributes: – IRQ number – IRQ handler function – Whether the IRQ is shared ...
Introduction
... • OS services only accessed via system calls • Users and programs can’t directly access the hardware Set of System Calls (APIs) is what programs think the operating system is CSE 331 Operating Systems Design ...
... • OS services only accessed via system calls • Users and programs can’t directly access the hardware Set of System Calls (APIs) is what programs think the operating system is CSE 331 Operating Systems Design ...
What is an Operating System?
... Time-Sharing Systems Personal-Computer Systems Parallel Systems Distributed Systems ...
... Time-Sharing Systems Personal-Computer Systems Parallel Systems Distributed Systems ...
One Network Technology Overview
... extensibility has been solved in the world of object-oriented ...
... extensibility has been solved in the world of object-oriented ...
Abstract View of System Components
... Time-Sharing Systems Personal-Computer Systems Parallel Systems Distributed Systems ...
... Time-Sharing Systems Personal-Computer Systems Parallel Systems Distributed Systems ...
CS 519: Operating System Theory
... Minor policy questions: Who can create/destroy/suspend processes? How many active processes can each user have? ...
... Minor policy questions: Who can create/destroy/suspend processes? How many active processes can each user have? ...
OS Execution on Multi-Cores: Is Out
... augmenting microarchitectural structures during operating system execution to improve energy efficiency. They identify aliasing in branch predictors as a major source of conflicts between user and OS codes and propose hardware extensions that decrease the aliasing. They find that allowing L1 caches ...
... augmenting microarchitectural structures during operating system execution to improve energy efficiency. They identify aliasing in branch predictors as a major source of conflicts between user and OS codes and propose hardware extensions that decrease the aliasing. They find that allowing L1 caches ...
Set 1
... The instructor reserves the right to fail, regardless of overall numeric score, students who do not submit a good faith attempt to complete all programming assignments. ...
... The instructor reserves the right to fail, regardless of overall numeric score, students who do not submit a good faith attempt to complete all programming assignments. ...
Windows 2000 System Architecture
... Included to meet US Government requirements Windows 2000 implements POSIX 1003.1 Provides limited set of services • Can’t create threads, windows or use sockets! – Executables linked against POSIX subsystem library (Psxdll.dll) – Commercial Unix-to-Win32 library better approach for porting UNIX appl ...
... Included to meet US Government requirements Windows 2000 implements POSIX 1003.1 Provides limited set of services • Can’t create threads, windows or use sockets! – Executables linked against POSIX subsystem library (Psxdll.dll) – Commercial Unix-to-Win32 library better approach for porting UNIX appl ...
What is an Operating System?
... System call – request to the operating system to allow user to wait for I/O completion Device-status table contains entry for each I/O device indicating its type, address, and state Operating system indexes into I/O device table to determine device status and to modify table entry to include i ...
... System call – request to the operating system to allow user to wait for I/O completion Device-status table contains entry for each I/O device indicating its type, address, and state Operating system indexes into I/O device table to determine device status and to modify table entry to include i ...