will NGX_AGAIN kill performance?

[Abioy Sun]

hi,

>
> NGX_AGAIN is usually for non-blocking I/O operations, it's key for
> good performance under high concurrency level
in fact, that's what i'm doing. but i also doubt if the main request wake up
every time an event arrived(made by not only subrequest), will it spent most
of the time doing sth useless?

thx

Abioy
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