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The time between when a thread is scheduled and when it begins to execute. Theoretically, in a preemptive OS the dispatch latency for a high-priority thread should be very low. However, in practice preemptive OSs are non-preemptive at times; for example, while running an interrupt handler. The duration of the longest possible non-preemptive interval is said to be the worst-case dispatch latency of an OS.

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What is Dispatch latency example?

Dispatch latency refers to the delay between the time a task is ready to run and the moment it actually starts executing on the CPU. For example, in a multi-threaded application, if a thread is scheduled to run but must wait for the CPU to become available due to higher-priority tasks, the time spent waiting represents dispatch latency. This can affect the overall performance and responsiveness of the application, particularly in real-time systems where timely execution is critical.


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