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Re: WAL fsync scheduling - Mailing list pgsql-hackers

From Tom Lane
Subject Re: WAL fsync scheduling
Date
Msg-id 482.974524538@sss.pgh.pa.us
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In response to WAL fsync scheduling  (Bruce Momjian <pgman@candle.pha.pa.us>)
Responses Re: WAL fsync scheduling  (Bruce Momjian <pgman@candle.pha.pa.us>)
Re: WAL fsync scheduling  (Larry Rosenman <ler@lerctr.org>)
List pgsql-hackers
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Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Other backend will see they are not the lowest
> WAIT_ON_FSYNC and will wait for their byte to be set to NOT_IN_COMMIT
> so they can then continue, knowing their data was synced.

How will they wait?  Without a semaphore involved, your answer must
be either "timed sleep" or "busy-wait loop", neither of which is
attractive ...
        regards, tom lane

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