Best algorithms + best computers = powerful match
... abstractions that Determinator emulates at the user level. A Determinator space cannot outlive its parent, and a space can directly interact only with its immediate parent and children via three system calls described below. The kernel provides no file systems, writable shared memory, or other abstr ...
... abstractions that Determinator emulates at the user level. A Determinator space cannot outlive its parent, and a space can directly interact only with its immediate parent and children via three system calls described below. The kernel provides no file systems, writable shared memory, or other abstr ...
Processes
... a set of operating system resources (open files, connections to other programs, etc.) All in the Process's address space (except?) ...
... a set of operating system resources (open files, connections to other programs, etc.) All in the Process's address space (except?) ...
Operating-System Structures
... • Program execution – OS capability to load a program into memory, run it, end execution, either normally or abnormally (indicating error). • I/O operations – since user programs cannot execute I/O operations directly, the OS must provide some means to perform I/O, which may involve a file or I/O de ...
... • Program execution – OS capability to load a program into memory, run it, end execution, either normally or abnormally (indicating error). • I/O operations – since user programs cannot execute I/O operations directly, the OS must provide some means to perform I/O, which may involve a file or I/O de ...
Operating Systems Principles Lecture 1: Introduction
... User needs to think in terms of problem to be solved • High-level data structures and corresponding operations • Simple, uniform interfaces to subsystems, • Treat programs and data files as single entities ...
... User needs to think in terms of problem to be solved • High-level data structures and corresponding operations • Simple, uniform interfaces to subsystems, • Treat programs and data files as single entities ...
Processes and Threads
... Process Management • Process management is a major function of the OS • OS manages CPU sharing with several processes in memory at the same time • The concept above is called multiprogramming ...
... Process Management • Process management is a major function of the OS • OS manages CPU sharing with several processes in memory at the same time • The concept above is called multiprogramming ...
SCADA Systems
... regulators. We need also screen forms process parameters indicators of different types: arrows-based, shift-based, digital indicators, and also alerting tables of different form and contents. Also, we need possibility of creation of archives of events and keep track of variables behavior with time r ...
... regulators. We need also screen forms process parameters indicators of different types: arrows-based, shift-based, digital indicators, and also alerting tables of different form and contents. Also, we need possibility of creation of archives of events and keep track of variables behavior with time r ...
Class 7.1 Integers Characters Input Output
... Up until now, your programs have been running with SPIM used as a computer with no machine code in it but your own. Organizing Input/Output by the user program is very costly process causing duplication of significant parts of the program code. In even the simplest computer, putting a character on t ...
... Up until now, your programs have been running with SPIM used as a computer with no machine code in it but your own. Organizing Input/Output by the user program is very costly process causing duplication of significant parts of the program code. In even the simplest computer, putting a character on t ...
I/O Management and Disk Scheduling
... • Why buffering is required? – When a user process wants to read blocks of data from a disk, process waits for the transfer – It waits either by • Busy waiting • Process suspension on an interrupt – The problems with this approach • Program waits for slow I/O • Virtual locations should stay in the m ...
... • Why buffering is required? – When a user process wants to read blocks of data from a disk, process waits for the transfer – It waits either by • Busy waiting • Process suspension on an interrupt – The problems with this approach • Program waits for slow I/O • Virtual locations should stay in the m ...
Operating Systems Principles Lecture 1: Introduction
... User needs to think in terms of problem to be solved • High-level data structures and corresponding operations • Simple, uniform interfaces to subsystems, • Treat programs and data files as single entities ...
... User needs to think in terms of problem to be solved • High-level data structures and corresponding operations • Simple, uniform interfaces to subsystems, • Treat programs and data files as single entities ...
CS423/523
... 1. Each process must have enough memory in which to execute, and respect memory boundaries of each other 2. Different types of memory must be used properly so that each process can run most effectively such as ...
... 1. Each process must have enough memory in which to execute, and respect memory boundaries of each other 2. Different types of memory must be used properly so that each process can run most effectively such as ...
the linux operating system
... made to any portion of a typical monolithic OS, all the modules and routines must be relinked and reinstalled and the system rebooted before the changes can take effect. As a result, any modification, such as adding a new device driver or file system function, is difficult. This problem is especiall ...
... made to any portion of a typical monolithic OS, all the modules and routines must be relinked and reinstalled and the system rebooted before the changes can take effect. As a result, any modification, such as adding a new device driver or file system function, is difficult. This problem is especiall ...
I/O Systems - Ubiquitous Computing Lab
... • Arm only goes as far as the last request in each direction, then reverses direction immediately, without first going all the way to the end of the disk. ...
... • Arm only goes as far as the last request in each direction, then reverses direction immediately, without first going all the way to the end of the disk. ...
Multitasking and Time Slices
... available processor time among the processes or threads that need it. The system is designed for preemptive multitasking; it allocates a processor time slice to each thread it executes. The currently executing thread is suspended when its time slice elapses, allowing another thread to run. When the ...
... available processor time among the processes or threads that need it. The system is designed for preemptive multitasking; it allocates a processor time slice to each thread it executes. The currently executing thread is suspended when its time slice elapses, allowing another thread to run. When the ...
Linux - the most important … Linux: SHELL ~$ command –options
... Linux: SHELL ~$ command –options parameters; case sensitive; always know your working directory (pwd); # - root permissions, $ - user permissions; single filetree with one beginning (/); spaces in filename not recommended; use “smth“ for spaces, ’smth’ does not execute, \ - escape character, * - any ...
... Linux: SHELL ~$ command –options parameters; case sensitive; always know your working directory (pwd); # - root permissions, $ - user permissions; single filetree with one beginning (/); spaces in filename not recommended; use “smth“ for spaces, ’smth’ does not execute, \ - escape character, * - any ...
Directories
... • There was also a filename length limit of 14 characters. • In 1991 a new file system came with addition of new file system as a layer on top of linux kerenl that provide generic file API. Termed as VFS termed as ext. • But has problems like allowed 2 gigabytes of data and filenames of up to 255 ch ...
... • There was also a filename length limit of 14 characters. • In 1991 a new file system came with addition of new file system as a layer on top of linux kerenl that provide generic file API. Termed as VFS termed as ext. • But has problems like allowed 2 gigabytes of data and filenames of up to 255 ch ...
Module 3: Operating-System Structures
... of the Research Group at Bell Laboratories; incorporated features of other operating systems, especially MULTICS. The third version was written in C, which was developed at Bell Labs specifically to support UNIX. The most influential of the non-Bell Labs and non-AT&T UNIX development groups — Un ...
... of the Research Group at Bell Laboratories; incorporated features of other operating systems, especially MULTICS. The third version was written in C, which was developed at Bell Labs specifically to support UNIX. The most influential of the non-Bell Labs and non-AT&T UNIX development groups — Un ...
Concurrent processes and programming
... • Threads run in top of a run-time support library • A blocking system call from an executing thread is not trapped by the OS but is routed to the run-time procedure • Context-switching requires very little overhead ...
... • Threads run in top of a run-time support library • A blocking system call from an executing thread is not trapped by the OS but is routed to the run-time procedure • Context-switching requires very little overhead ...
2.01
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
Distributed Systems --- Distribution and Operating Systems
... I Hence separate processes were inappropriate for such tasks I An early work-around was for the application to write its own basic ‘sub-process scheduler’ I For example allowing a request object time to run before ‘switching’ to the next request object I But this was throwing out a lot of the advant ...
... I Hence separate processes were inappropriate for such tasks I An early work-around was for the application to write its own basic ‘sub-process scheduler’ I For example allowing a request object time to run before ‘switching’ to the next request object I But this was throwing out a lot of the advant ...
Lecture 2, Part 1
... • Method of accessing devices via direct CPU control – CPU transfers data to/from device controller registers – Transfers are typically one byte or word at a time – May be accomplished with normal or I/O instructions ...
... • Method of accessing devices via direct CPU control – CPU transfers data to/from device controller registers – Transfers are typically one byte or word at a time – May be accomplished with normal or I/O instructions ...
Architectural Support for Operating Systems
... – Looks up the page table entry (PTE) for this reference – PTE tells the processor where to find the data in memory (by adding the offset to the base address in the PTE) – PTE can also specify other things such as protection status of page, which “end” it starts at if the page is only partially fill ...
... – Looks up the page table entry (PTE) for this reference – PTE tells the processor where to find the data in memory (by adding the offset to the base address in the PTE) – PTE can also specify other things such as protection status of page, which “end” it starts at if the page is only partially fill ...
Fundamental Concepts of Operating Systems
... Pace University December 4, 2002 Chapter 1: Introduction ...
... Pace University December 4, 2002 Chapter 1: Introduction ...
threads
... 4.5 Operating System Examples Linux refers to them as tasks rather than threads Thread creation is done through clone() system call clone() allows a child task to specify how much sharing ...
... 4.5 Operating System Examples Linux refers to them as tasks rather than threads Thread creation is done through clone() system call clone() allows a child task to specify how much sharing ...
Slides
... you can instruct make to automatically rebuild your program whenever one of the program's component files is modified. Make is smart enough to only recompile the files that were affected by changes thus saving compile time. ...
... you can instruct make to automatically rebuild your program whenever one of the program's component files is modified. Make is smart enough to only recompile the files that were affected by changes thus saving compile time. ...
Slide 1
... • Simplest, fairest and most widely used • Each process is assigned a quantum (time interval) which it is allowed to run • If the process is still running at the end of quantum, the CPU is preempted and given to another process • Also the CPU switches when a process blocks ...
... • Simplest, fairest and most widely used • Each process is assigned a quantum (time interval) which it is allowed to run • If the process is still running at the end of quantum, the CPU is preempted and given to another process • Also the CPU switches when a process blocks ...