Operating Systems 2230 Lecture 7: Uniprocessor scheduling
... right number of currently-executing processes), the long-term scheduler will be invoked only when a running process terminates. Alternatively, when the CPU becomes sufficiently idle, the long-term scheduler may be permitted to introduce a new process. Interactive versus Batch Scheduling These condit ...
... right number of currently-executing processes), the long-term scheduler will be invoked only when a running process terminates. Alternatively, when the CPU becomes sufficiently idle, the long-term scheduler may be permitted to introduce a new process. Interactive versus Batch Scheduling These condit ...
What is an Operating System?
... simultaneous I/O processing After I/O starts, control returns to user program without waiting for I/O completion 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 ...
... simultaneous I/O processing After I/O starts, control returns to user program without waiting for I/O completion 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 ...
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. ...
SanOS - jbox.dk
... What can a jbox be used for? • What would we like to achieve? – Apply the virtues of traditional appliances to IT business systems – Apply the effective software development tools, utilities, and methodologies to appliance development ...
... What can a jbox be used for? • What would we like to achieve? – Apply the virtues of traditional appliances to IT business systems – Apply the effective software development tools, utilities, and methodologies to appliance development ...
Special Topics on Operating System
... – if # of free pages > free_page_high do nothing – otherwise kswapd try to reduce the number of physical pages being used by the system: ...
... – if # of free pages > free_page_high do nothing – otherwise kswapd try to reduce the number of physical pages being used by the system: ...
Processes
... • The man command gives info about a command, program, library function, or system call. • The /proc file system in Linux is the kernel interface to users to look to the kernel state (variables, structures, etc.). ...
... • The man command gives info about a command, program, library function, or system call. • The /proc file system in Linux is the kernel interface to users to look to the kernel state (variables, structures, etc.). ...
Implementing Processes, Threads, and Resources
... OS Structures-Simple Approach • MS-DOS - written to provide the most functionality in the least space – not divided into modules – Although MS-DOS has some structures, its interfaces and levels of functionality are not well separated. • application programs are able to access BIOS routines directly ...
... OS Structures-Simple Approach • MS-DOS - written to provide the most functionality in the least space – not divided into modules – Although MS-DOS has some structures, its interfaces and levels of functionality are not well separated. • application programs are able to access BIOS routines directly ...
Micro-CernVM: Slashing the Cost of Building and
... /.ucernvm_bootstrap This is a shell script provided by the operating system repository. It is sourced just before the root file system is switched and allows for custom actions. Special care has to be taken in the shutdown script of the operating system. Typically, the shutdown script does not expe ...
... /.ucernvm_bootstrap This is a shell script provided by the operating system repository. It is sourced just before the root file system is switched and allows for custom actions. Special care has to be taken in the shutdown script of the operating system. Typically, the shutdown script does not expe ...
Processes
... – Create and initialize a new address space – Load the program into the address space – Copy arguments into memory in the address space – Initialize the hardware context to start execution at ...
... – Create and initialize a new address space – Load the program into the address space – Copy arguments into memory in the address space – Initialize the hardware context to start execution at ...
lecture3
... • Process Control Information – Scheduling and State •Process state: defines the readiness of the process to be scheduled for execution (e.g., running, ready, waiting, halted). •Priority: One or more fields may be used to describe the scheduling priority of the process. In some systems, several valu ...
... • Process Control Information – Scheduling and State •Process state: defines the readiness of the process to be scheduled for execution (e.g., running, ready, waiting, halted). •Priority: One or more fields may be used to describe the scheduling priority of the process. In some systems, several valu ...
Introduction
... standards for the operation of I/O devices exist; different sequences of instructions are usually required not only for each major device class (e.g., laser printers) but also for each individual device model within that class. To liberate the programmer from the low-level details and complexity of ...
... standards for the operation of I/O devices exist; different sequences of instructions are usually required not only for each major device class (e.g., laser printers) but also for each individual device model within that class. To liberate the programmer from the low-level details and complexity of ...
Operating Systems
... to the system for processing – May be first-come-first-served – Or according to criteria such as priority, I/O requirements or expected execution time ...
... to the system for processing – May be first-come-first-served – Or according to criteria such as priority, I/O requirements or expected execution time ...
View
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure Operating System Debugging Operating System Generation ...
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure Operating System Debugging Operating System Generation ...
LESSON PLAN PCCS4304 OPERATING SYSTEM (3-0-0)
... Real time system is one that must react to I/p & responds to them quickly. A real time system should not be late in response to one event. A real time should have well defined time constraints. Real time systems are of two types a. Hard Real Time Systems b. Soft Real Time Systems A hard re ...
... Real time system is one that must react to I/p & responds to them quickly. A real time system should not be late in response to one event. A real time should have well defined time constraints. Real time systems are of two types a. Hard Real Time Systems b. Soft Real Time Systems A hard re ...
Slide 10 : Multiprocessor Scheduling
... • the duration of a priority inversion depends not only on the time required to handle a shared resource, but also on the unpredictable actions of other unrelated tasks ...
... • the duration of a priority inversion depends not only on the time required to handle a shared resource, but also on the unpredictable actions of other unrelated tasks ...
CS-3013 Week 0:- Introduction
... security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happens if something goes wrong – hardware or software extensibility: can we add new features? communication: ...
... security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happens if something goes wrong – hardware or software extensibility: can we add new features? communication: ...
Figure 5.01
... counter, and one sequence of instructions that can be carried out at any given time. ...
... counter, and one sequence of instructions that can be carried out at any given time. ...
The concept of operating system
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each ...
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each ...
MSDOS-by-Andrew-Vogan-2002
... personal computers, designed for the Intel 8086/8088 CPUs. • MS-DOS shipped with the original IBM PC in 1981, and quickly grew to be the OS of choice for both IBM PC’s and “clones.” • “DOS” stands for “Disk Operating System.” MS-DOS came to provide not only the basic disk features provided by CP/M, ...
... personal computers, designed for the Intel 8086/8088 CPUs. • MS-DOS shipped with the original IBM PC in 1981, and quickly grew to be the OS of choice for both IBM PC’s and “clones.” • “DOS” stands for “Disk Operating System.” MS-DOS came to provide not only the basic disk features provided by CP/M, ...
1 Modeling an Operating System Kernel
... 1.5.1 The D ISK S WAP Component D ISK S WAP uses a function, nextProcessToSwapIn, to determine the next process, p, that is to be swapped. If p exists, it is the process with maximum value of swappedOutTime. D ISK S WAP then computes the memory size of the process, memSize(p), and checks whether the ...
... 1.5.1 The D ISK S WAP Component D ISK S WAP uses a function, nextProcessToSwapIn, to determine the next process, p, that is to be swapped. If p exists, it is the process with maximum value of swappedOutTime. D ISK S WAP then computes the memory size of the process, memSize(p), and checks whether the ...
Chapter 2: Operating-System Structures Silberschatz, Galvin and Gagne ©2013 – 9
... File-system manipulation - Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
... File-system manipulation - Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
Virtual machine - Duke Computer Science
... Sharing among components in Java is easy (call a function, compiler makes sure it is safe) Sharing between address spaces is more work, has higher overhead (use sockets, have to context switch, flush TLB, etc) ...
... Sharing among components in Java is easy (call a function, compiler makes sure it is safe) Sharing between address spaces is more work, has higher overhead (use sockets, have to context switch, flush TLB, etc) ...