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2dbe890571
Macs don't understand O_DIRECT, but they can disable caching with a separate fcntl() call. Extend the file opening functions in fd.c to handle this for us if the caller passes in PG_O_DIRECT. For now, this affects only WAL data and even then only if you set: max_wal_senders=0 wal_level=minimal This is not expected to be very useful on its own, but later proposed patches will make greater use of direct I/O, and it'll be useful for testing if developers on Macs can see the effects. Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/CA%2BhUKG%2BADiyyHe0cun2wfT%2BSVnFVqNYPxoO6J9zcZkVO7%2BNGig%40mail.gmail.com |
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