Test1: Spring 2017 (Hint)
... Q1A. One of the claims for Operating Systems is that it provides a set of services to system users. Who could possibly be its users? What set of services do the users require and do receive from its Operating systems? Ans. The users of an OS are: processes (and threads) including the kernel processe ...
... Q1A. One of the claims for Operating Systems is that it provides a set of services to system users. Who could possibly be its users? What set of services do the users require and do receive from its Operating systems? Ans. The users of an OS are: processes (and threads) including the kernel processe ...
File - ashish b. khare
... demanded by the process are swapped from secondary storage to main memory. Contrast this to pure swapping, where all memory for a process is swapped from secondary storage to main memory during the process startup. When a process is to be swapped into main memory for processing, the pager guesses wh ...
... demanded by the process are swapped from secondary storage to main memory. Contrast this to pure swapping, where all memory for a process is swapped from secondary storage to main memory during the process startup. When a process is to be swapped into main memory for processing, the pager guesses wh ...
Chapter 6: Operating Systems: The Genie in the Computer
... Memory Limitations: Cache and Virtual Memory ...
... Memory Limitations: Cache and Virtual Memory ...
document
... Command processor: CCP: was a simple command line interface, patterned after RSTS for the PDP-11. Commands generally took the form of a keyword followed by a list of parameters, separated by spaces. Commands not recognized as part of the built-in commands were assumed to be transient user programs, ...
... Command processor: CCP: was a simple command line interface, patterned after RSTS for the PDP-11. Commands generally took the form of a keyword followed by a list of parameters, separated by spaces. Commands not recognized as part of the built-in commands were assumed to be transient user programs, ...
Operating Systems
... Long term scheduler determines which programs are admitted to the system for processing. It controls the degree of multiprogramming. Once admitted, a job becomes a process. Medium term scheduling is part of the swapping function. This relates to processes that are in a blocked or suspended state. T ...
... Long term scheduler determines which programs are admitted to the system for processing. It controls the degree of multiprogramming. Once admitted, a job becomes a process. Medium term scheduling is part of the swapping function. This relates to processes that are in a blocked or suspended state. T ...
Background - The University of Alabama in Huntsville
... • NUMA machines were designed to address the scalability issues of SMPs ...
... • NUMA machines were designed to address the scalability issues of SMPs ...
Operating Systems
... Processor time alternates between execution of user programs and execution of the monitor ...
... Processor time alternates between execution of user programs and execution of the monitor ...
Week-09.2-1
... In demand paging, the pages are brought into memory on demand. The act of bringing in a page from secondary memory, which often causes another page to be written back to secondary memory, is called a ...
... In demand paging, the pages are brought into memory on demand. The act of bringing in a page from secondary memory, which often causes another page to be written back to secondary memory, is called a ...
CS 111
... Now that we know this is what this simple program acting as an operating system will do, how do we go about getting this "Print 111" program loaded on the computer so that when the machine turns on, this code will be run? We could put the program in the BIOS, a region of stable memory that is read-o ...
... Now that we know this is what this simple program acting as an operating system will do, how do we go about getting this "Print 111" program loaded on the computer so that when the machine turns on, this code will be run? We could put the program in the BIOS, a region of stable memory that is read-o ...
Chapter10
... Paged Memory Management • Paged memory technique Processes are divided into fixed-size pages and stored in memory frames – Frame A piece of main memory that holds a process page – Page A piece of a process that is stored into a memory frame – Page-map table (PMT) A table used by the operating syste ...
... Paged Memory Management • Paged memory technique Processes are divided into fixed-size pages and stored in memory frames – Frame A piece of main memory that holds a process page – Page A piece of a process that is stored into a memory frame – Page-map table (PMT) A table used by the operating syste ...
slides
... multiprogramming organizes jobs (code and data) so CPU always has one to execute subset of total jobs in system is kept in memory one job selected and run via job scheduling when it has to wait (for I/O for example), OS switches to another job ...
... multiprogramming organizes jobs (code and data) so CPU always has one to execute subset of total jobs in system is kept in memory one job selected and run via job scheduling when it has to wait (for I/O for example), OS switches to another job ...
interrupt
... • 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 – Response time should be < 1 second – If several jobs ready to run at the same time CPU scheduling – If processes do ...
... • 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 – Response time should be < 1 second – If several jobs ready to run at the same time CPU scheduling – If processes do ...
Operating Systems
... The area of the hard disk used for virtual memory is called a swap file because it swaps data between memory and storage. A page is the amount of data that can swap at a given time. The technique of swapping items between memory and storage, called paging, is a timeconsuming process for the comp ...
... The area of the hard disk used for virtual memory is called a swap file because it swaps data between memory and storage. A page is the amount of data that can swap at a given time. The technique of swapping items between memory and storage, called paging, is a timeconsuming process for the comp ...
Operating Systems
... The area of the hard disk used for virtual memory is called a swap file because it swaps data between memory and storage. A page is the amount of data that can swap at a given time. The technique of swapping items between memory and storage, called paging, is a timeconsuming process for the comp ...
... The area of the hard disk used for virtual memory is called a swap file because it swaps data between memory and storage. A page is the amount of data that can swap at a given time. The technique of swapping items between memory and storage, called paging, is a timeconsuming process for the comp ...
History of Operating Systems
... The use of integrated circuits dramatically improved computer speeds. Batch systems ran “continuously”, but only one job at a time. If a job was paused (to execute an IO process) the CPU was idle, if only for a few milliseconds. The same philosophy that led to 2nd generation systems held - how to ma ...
... The use of integrated circuits dramatically improved computer speeds. Batch systems ran “continuously”, but only one job at a time. If a job was paused (to execute an IO process) the CPU was idle, if only for a few milliseconds. The same philosophy that led to 2nd generation systems held - how to ma ...
Page 1 Operating System Users and User Programs Hardware
... One data can appear in several places. If it is modified in one place, all copies have to be updated. The problem becomes complex with multiprocessing. ...
... One data can appear in several places. If it is modified in one place, all copies have to be updated. The problem becomes complex with multiprocessing. ...
IT241 Final Exam Study Guide
... points to the head of a list of interrupt handlers. When an interrupt is raised, the handlers on the corresponding list are called one by one, until one is found that can service the request. This is a compromise between the overhead of a huge interrupt table and the inefficiency of dispatching to a ...
... points to the head of a list of interrupt handlers. When an interrupt is raised, the handlers on the corresponding list are called one by one, until one is found that can service the request. This is a compromise between the overhead of a huge interrupt table and the inefficiency of dispatching to a ...
L03_Processes
... The kernel contains code for the most basic OS services All other OS services are provided by separate processes running in user space Can modify components while system is running, don’t need to recompile to change a driver or other component kernel, drivers export function tables to each oth ...
... The kernel contains code for the most basic OS services All other OS services are provided by separate processes running in user space Can modify components while system is running, don’t need to recompile to change a driver or other component kernel, drivers export function tables to each oth ...
Memory Management
... Yes, it’s “logical” and it facilitates sharing and reuse But it has all the horror of a variable partition system e.g., external fragmentation ...
... Yes, it’s “logical” and it facilitates sharing and reuse But it has all the horror of a variable partition system e.g., external fragmentation ...
Adeyl Khan
... The time slice ends The CPU begins processing a different program Response time can vary based upon the number of users on the system ...
... The time slice ends The CPU begins processing a different program Response time can vary based upon the number of users on the system ...
history
... • OS consisted of an input/output system for reading and writing magnetic tapes and a command interpreter for JCL on cards ...
... • OS consisted of an input/output system for reading and writing magnetic tapes and a command interpreter for JCL on cards ...
Chapter 2: OS Structures
... hardware and the operating system kernel as though they were all hardware • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) ...
... hardware and the operating system kernel as though they were all hardware • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) ...