dsk-03-sched
... selected next Short process jumps ahead of longer processes Predictability of longer processes is reduced If estimated time for process not correct, the operating system may abort it Possibility of starvation for longer processes ...
... selected next Short process jumps ahead of longer processes Predictability of longer processes is reduced If estimated time for process not correct, the operating system may abort it Possibility of starvation for longer processes ...
CS 519 Operating Systems Theory Spring 1998
... traditional approach: OS provides a sufficiently large virtual address space for each running application, does memory allocation and replacement and may ensure protection new approaches: external memory management, huge (64-bit) address space, global memory ...
... traditional approach: OS provides a sufficiently large virtual address space for each running application, does memory allocation and replacement and may ensure protection new approaches: external memory management, huge (64-bit) address space, global memory ...
Selling an Idea or a Product
... When computers cost millions of $’s, optimize for more efficient use of the hardware! Lack of interaction between user and computer. User at console: one user at a time. Batch monitor: load program, run, print. – Computers are expensive, so optimize to make better use of the ...
... When computers cost millions of $’s, optimize for more efficient use of the hardware! Lack of interaction between user and computer. User at console: one user at a time. Batch monitor: load program, run, print. – Computers are expensive, so optimize to make better use of the ...
lecture10
... particular system entity—either local or remote—must be both invisible to, and undetectable by the user. • Location transparency - Location transparency comprises two distinct subaspects of transparency, Naming transparency and User mobility. Naming transparency requires that nothing in the physical ...
... particular system entity—either local or remote—must be both invisible to, and undetectable by the user. • Location transparency - Location transparency comprises two distinct subaspects of transparency, Naming transparency and User mobility. Naming transparency requires that nothing in the physical ...
Lecture 1: Introduction
... Build - During the build process, the operating system is installed on the machine Initialize – Often directly after, or part of, build the process; This will typically include things like network configuration, naming, and may include OS patches and other changes Update - At some point after ...
... Build - During the build process, the operating system is installed on the machine Initialize – Often directly after, or part of, build the process; This will typically include things like network configuration, naming, and may include OS patches and other changes Update - At some point after ...
Slides
... • UNIX – limited by hardware functionality, the original UNIX operating system had limited structuring. The UNIX OS consists of two separable parts – Systems programs – The kernel • Consists of everything below the system-call interface and above the physical hardware • Provides the file system, CPU ...
... • UNIX – limited by hardware functionality, the original UNIX operating system had limited structuring. The UNIX OS consists of two separable parts – Systems programs – The kernel • Consists of everything below the system-call interface and above the physical hardware • Provides the file system, CPU ...
COS 318: Operating Systems Processes and Threads Kai Li and Andy Bavier
... Example: many users can run the same program • Each process has its own address space, i.e., even though program has single set of variable names, each process will have different values ...
... Example: many users can run the same program • Each process has its own address space, i.e., even though program has single set of variable names, each process will have different values ...
Operating Systems and System Software
... abstracted from the operating system to a large degree. Most users have no desire to know how files are stored or how programs are run. They just want the damn computer to do the work. ICONs are a perfect example the user double clicks on a icon and something happens. So most users don’t distinguish ...
... abstracted from the operating system to a large degree. Most users have no desire to know how files are stored or how programs are run. They just want the damn computer to do the work. ICONs are a perfect example the user double clicks on a icon and something happens. So most users don’t distinguish ...
Core System Services
... • The role of inetd is to function as a “superserver” to other network server–related processes, such as telnet, ftp, tftp, etc. • So instead of constantly maintaining potentially dozens of services loaded in memory waiting to be used, they are all listed in inetd’s configuration ...
... • The role of inetd is to function as a “superserver” to other network server–related processes, such as telnet, ftp, tftp, etc. • So instead of constantly maintaining potentially dozens of services loaded in memory waiting to be used, they are all listed in inetd’s configuration ...
Slide 1
... History of operating systems Operating system concepts Operating system structure Reference: Operating Systems Design and Implementation (2nd edition) by Andrew S. Tanenbaum and Albert S. Woodhull ...
... History of operating systems Operating system concepts Operating system structure Reference: Operating Systems Design and Implementation (2nd edition) by Andrew S. Tanenbaum and Albert S. Woodhull ...
Basic System Administration
... • Over 1,000 system calls available on Linux • 3 main categories – File/device manipulation • e.g. mkdir(), unlink() ...
... • Over 1,000 system calls available on Linux • 3 main categories – File/device manipulation • e.g. mkdir(), unlink() ...
CENG334 Introduction to Operating Systems
... straight runs of instructions ending in a jump, call, trap or other instructions that change the flow of execution. The basic block is inspected if it contains any “privileged instructions”. If so, each one is replaced with a call to VMware procedure that handles it. The final instruction is also re ...
... straight runs of instructions ending in a jump, call, trap or other instructions that change the flow of execution. The basic block is inspected if it contains any “privileged instructions”. If so, each one is replaced with a call to VMware procedure that handles it. The final instruction is also re ...
PowerPoint 2003 - FSU Computer Science
... of infinite physical memory Swapping: moves processes to disk as necessary Paging: allows processes to run with only the active pages in memory Assumptions: scarcity of memory and locality of reference ...
... of infinite physical memory Swapping: moves processes to disk as necessary Paging: allows processes to run with only the active pages in memory Assumptions: scarcity of memory and locality of reference ...
PowerPoint 2003
... of infinite physical memory Swapping: moves processes to disk as necessary Paging: allows processes to run with only the active pages in memory Assumptions: scarcity of memory and locality of reference ...
... of infinite physical memory Swapping: moves processes to disk as necessary Paging: allows processes to run with only the active pages in memory Assumptions: scarcity of memory and locality of reference ...
Chapter 9
... priority levels • Adjustment factor used to keep process in its assigned band (decreasing order of priority): – Swapper – Block I/O device control – File manipulation – Character I/O device control – User processes ...
... priority levels • Adjustment factor used to keep process in its assigned band (decreasing order of priority): – Swapper – Block I/O device control – File manipulation – Character I/O device control – User processes ...
over view of operating system
... When it has to wait (for I/O for example), OS switches to another job Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
... When it has to wait (for I/O for example), OS switches to another job Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
Chapter 2: Operating-System Structures
... • UNIX – limited by hardware functionality, the original UNIX operating system had limited structuring. The UNIX OS consists of two separable parts – Systems programs – The kernel • Consists of everything below the system-call interface and above the physical hardware • Provides the file system, CPU ...
... • UNIX – limited by hardware functionality, the original UNIX operating system had limited structuring. The UNIX OS consists of two separable parts – Systems programs – The kernel • Consists of everything below the system-call interface and above the physical hardware • Provides the file system, CPU ...
1) Routine is not loaded until it is called. All routines are kept on disk
... 39) Virtual memory is __________. 1 An extremely large main memory 2 An extremely large secondary memory 3 An illusion of extremely large main memory 4 A type of memory used in super computers. ...
... 39) Virtual memory is __________. 1 An extremely large main memory 2 An extremely large secondary memory 3 An illusion of extremely large main memory 4 A type of memory used in super computers. ...
Process Concept
... • Behind the scenes, functions that make up an API typically invoke system calls. Why would an application programmer prefer programming according to an API rather than invoking actual system calls? ...
... • Behind the scenes, functions that make up an API typically invoke system calls. Why would an application programmer prefer programming according to an API rather than invoking actual system calls? ...
Slides - Dr. Choong
... Program : a set of data and code that manipulate it Process : a program in execution States of a Process Running, Waiting, Ready, etc. Process “Tree” ...
... Program : a set of data and code that manipulate it Process : a program in execution States of a Process Running, Waiting, Ready, etc. Process “Tree” ...
Sistem Operasi
... The basic unit of computer storage is the bit. A bit can contain one of two values, 0 and 1. All other storage in a computer is based on collections of bits. Given enough bits, it is amazing how many things a computer can represent: numbers, letters, images, movies, sounds, documents, and programs, ...
... The basic unit of computer storage is the bit. A bit can contain one of two values, 0 and 1. All other storage in a computer is based on collections of bits. Given enough bits, it is amazing how many things a computer can represent: numbers, letters, images, movies, sounds, documents, and programs, ...
Lecture slides
... The idea behind operating different services at different run levels essentially revolves around the fact that different systems can be used in different ways. Some services cannot be used until the system is in a particular state, or mode, such as being ready for more than one user or having networ ...
... The idea behind operating different services at different run levels essentially revolves around the fact that different systems can be used in different ways. Some services cannot be used until the system is in a particular state, or mode, such as being ready for more than one user or having networ ...
col
... • Manages all of the software and hardware on the computer • Many processes running at the same time, ...
... • Manages all of the software and hardware on the computer • Many processes running at the same time, ...
lect8_9 - Computer and Information Sciences
... • Access to the memory and resources of its process – all threads of a process share this access ...
... • Access to the memory and resources of its process – all threads of a process share this access ...
Lecture-1
... • These libraries are stored on disk. • Linker links only the libraries referenced by the program • Main disadvantage: needs a lot of memory (for example, consider standard functions such as printf and scanf. They are used almost by every application. Now, if a system is running 50-100 processes, ea ...
... • These libraries are stored on disk. • Linker links only the libraries referenced by the program • Main disadvantage: needs a lot of memory (for example, consider standard functions such as printf and scanf. They are used almost by every application. Now, if a system is running 50-100 processes, ea ...