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Erlang / Erlang Advanced Interview questions

What is erlang:process_flag(priority,...) used for?

Every Erlang process has a scheduling priority — low, normal (the default), high, or max — that influences how eagerly the scheduler picks it from the run queue relative to other ready processes on the same scheduler.

process_flag(priority, high).

Higher-priority processes get scheduled ahead of lower-priority ones when both are runnable, which can help for genuinely latency-sensitive internal system processes (some parts of the runtime itself use max). It does not grant more CPU time overall, extra reductions per run, or preempt a currently running lower-priority process mid-execution — it only affects the order processes are picked from the queue when the scheduler is choosing what to run next.

What does raising a process's priority to `high` actually change?
Can a high-priority process preempt a currently executing lower-priority process mid-run?

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