The amount of time required for the scheduling dispatcher to stop one process and start another is known as ______________

Question

BlackTom AI · Accepted Answer

Dispatch latency is the correct term: it denotes the time the scheduler (dispatcher) requires to stop one process and start another running on the CPU.

1) Relevant knowledge points and concepts
- Dispatcher: the component of an OS that gives control of the CPU to a selected process.  
- Context switch: the operation of saving the state of the currently running process and loading the state of another process. It is the mechanism by which the dispatcher implements process switching.  
- Dispatch latency: the elapsed time from the instant a ready process is selected by the scheduler to the instant that process actually starts executing on the CPU. It includes any overhead the dispatcher needs to perform before the process runs.  
- Interrupt latency: the delay between the arrival of an interrupt and the start of the interrupt service routine (ISR).  
- Event latency: a more general, nonstandard term referring to delays in handling some event (not the specific dispatcher-to-process start time).

2) Step-by-step reasoning
- A scheduling decision is made to run process B instead of process A.  
- The dispatcher must stop A (save its context) and start B (restore its context). Those are context switch actions.  
- The specific interval from when the scheduler chooses B until B actually begins executing is the dispatch latency. That interval includes the dispatcher overhead (selecting process, performing necessary state changes) but conceptually focuses on the delay before B runs.

3) Calculations
- No numeric calculation is required here; the question asks for the term naming this interval.

4) Why the correct answer is correct
- “Dispatch latency” explicitly names the time required for the scheduler/dispatcher to stop one process and start another, matching the described interval.

5) Why other options are incorrect
- Event latency: too vague and not the standard term for scheduler-to-process start time.  
- Interrupt latency: refers to delay before an ISR begins after an interrupt, not process scheduling.  
- Context switch: denotes the operation or action itself (saving/restoring states), not specifically the time interval referred to as dispatch latency (though related).

6) Conclusion
The correct choice is dispatch latency, which matches the provided answer.

The amount of time required for the scheduling dispatcher to stop one process and start another is known as ______________单项选择题

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