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What (who) is context switching - definition

SWITCH BETWEEN PROCESSES OR TASKS ON A COMPUTER

Context switching; Thread switching latency; Process switching latency; Context Switch; Address space switch; Thread switch; Process switch; Address-space switch; Mode switch

Context switch

In computing, a context switch is the process of storing the state of a process or thread, so that it can be restored and resume execution at a later point, and then restoring a different, previously saved, state.

https://en.wikipedia.org/wiki/Context_switch

context switch

<operating system> When a multitasking operating system stops running one process and starts running another. Many operating systems implement concurrency by maintaining separate environments or "contexts" for each process. The amount of separation between processes, and the amount of information in a context, depends on the operating system but generally the OS should prevent processes interfering with each other, e.g. by modifying each other's memory. A context switch can be as simple as changing the value of the program counter and stack pointer or it might involve resetting the MMU to make a different set of memory pages available. In order to present the user with an impression of parallism, and to allow processes to respond quickly to external events, many systems will context switch tens or hundreds of times per second. (1996-12-18)

Switching barriers

ECONOMIC & PSYCHOLOGICAL COSTS OF SWITCHING FROM ONE ALTERNATIVE TO ANOTHER

Switching costs; Switching cost

Switching costs or switching barriers are terms used in microeconomics, strategic management, and marketing. They may be defined as the disadvantages or expenses consumers feel they experience, along with the economic and psychological costs of switching from one alternative to another.

https://en.wikipedia.org/wiki/Switching_barriers

Wikipedia

Context switch

In computing, a context switch is the process of storing the state of a process or thread, so that it can be restored and resume execution at a later point, and then restoring a different, previously saved, state. This allows multiple processes to share a single central processing unit (CPU), and is an essential feature of a multitasking operating system. In a traditional CPU, each process - a program in execution - utilizes the various CPU registers to store data and hold the current state of the running process. However, in a multitasking operating system, the operating system switches between processes or threads to allow the execution of multiple processes simultaneously. For every switch, the operating system must save the state of the currently running process, followed by loading the next process state, which will run on the CPU. This sequence of operations that stores the state of the running process and the loading of the following running process is called a context switch.

The precise meaning of the phrase "context switch" varies. In a multitasking context, it refers to the process of storing the system state for one task, so that task can be paused and another task resumed. A context switch can also occur as the result of an interrupt, such as when a task needs to access disk storage, freeing up CPU time for other tasks. Some operating systems also require a context switch to move between user mode and kernel mode tasks. The process of context switching can have a negative impact on system performance.^: 28

https://en.wikipedia.org/wiki/Context switch