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| author | Thomas Munro <tmunro@postgresql.org> | 2021-07-19 08:52:00 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2021-07-19 11:01:01 +1200 |
| commit | 2dbe8905711ba09a2214b6e835f8f0c2c4981cb3 (patch) | |
| tree | 775e44cb05c4dfa8f12e68eb388f04e9aa252c96 /src/backend/parser/parse_utilcmd.c | |
| parent | f157db862225a7bfe041ca3f7b73e913e2a8d8d6 (diff) | |
| download | postgresql-2dbe8905711ba09a2214b6e835f8f0c2c4981cb3.tar.gz postgresql-2dbe8905711ba09a2214b6e835f8f0c2c4981cb3.zip | |
Support direct I/O on macOS.
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
Diffstat (limited to 'src/backend/parser/parse_utilcmd.c')
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