Re: BUG #15396: initdb emits wrong comment for range for effective_io_concurrency

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От Sergei Kornilov
Тема Re: BUG #15396: initdb emits wrong comment for range for effective_io_concurrency
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Msg-id 15224851537727230@sas1-87f9feb8d943.qloud-c.yandex.net
обсуждение исходный текст
Ответ на BUG #15396: initdb emits wrong comment for range foreffective_io_concurrency  (PG Bug reporting form <noreply@postgresql.org>)
Ответы Re: BUG #15396: initdb emits wrong comment for range foreffective_io_concurrency
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Hello

effective_io_concurrency can not be set is your system does not support USE_POSIX_FADVISE. In this case only allowed
valuefor effective_io_concurrency is zero.
 
As far i know mac os does not support posix_fadvise.

Also this is documented behavior https://www.postgresql.org/docs/11/static/runtime-config-resource.html
> Asynchronous I/O depends on an effective posix_fadvise function, which some operating systems lack. If the function
isnot present then setting this parameter to anything but zero will result in an error. 
 

regards, Sergei

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