context switch


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context switch

[′kän‚text ‚swich]
(computer science)
The action of a central processing unit that suspends work on one process to work on another.

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.
References in periodicals archive ?
Context switch effects on acquisition and extinction in human predictive learning.
Experiment 2 explored the possibility of an explanation of context switch effects in this situation in terms of contexts entering into direct association with the US.
According to the results obtained in Experiment 1 with the non pre-exposed groups, a deleterious effect of context switch on conditioned responding to X was expected when extinguished in context B with respect to when it is extinguished in context A.
The context switch effect found on the continuously reinforced cue C1 when trained in a partial-reinforcement context and tested in a continuous-reinforcement context replicates the result reported by Abad et al.
The lack of context switch effect found in group Partial-Both is also consistent with the idea that partial reinforcement leads contexts to become predictors of the outcome (see also Murphy et al.
The predictability of the points of preemption, and the context switch time allows us to estimate a priori the time required to react to different events.
Table 2 isolates the context switch performance of OPS5 and CROPS5 at each of the data points.
Context Switch Performance Tokens Processed Number of Number Number Planes Prioritized Advice Gen.
Although previous results in our laboratory have shown that a context switch does not affect retrieval of acquisition before the interference training using a similar procedure to the one used in these experiments (e.
Experiment 2 found a context switch effect in all the tested cues.
The main aim of the experiments presented in this paper was to test the context switch effects upon a cue that has been paired with a single outcome.

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