async to async. Is there a performance penalty?

Question

Asynchronous programming

Hello!
Will there be a performance penalty from creating (async - a thread) a thread within a thread?

Thank you for your attention!

Answer 1

Looking about what specific implementation there is a speech. Usually not, because it's all handled by some sort of scheduler that sorts out the execution of subtasks. In addition, if you have one task inside another, this means that they are simply dependent on each other, which means that for the scheduler they will simply be the sequence A[inside] -> A[outside].