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Can someone explain to me why FastAPI recommends not to use async def in blocking I/O operations in detail? I've searched online but couldn't find a single explanation that had all the details.

Chris
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Diogo Crava
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1 Answers1

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quoting python-doc

Blocking (CPU-bound) code should not be called directly. For example, if a function performs a CPU-intensive calculation for 1 second, all concurrent asyncio Tasks and IO operations would be delayed by 1 second.

Alen Paul Varghese
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