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Add prefetching support on macOS

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macOS doesn't have posix_fadvise(), but fcntl() with the F_RDADVISE
command does the same thing.

Some related documentation has been generalized to not mention
posix_advise() specifically anymore.

Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/0827edec-1317-4917-a186-035eb1e3241d%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2024-08-28 07:26:48 +02:00
parent 2e6a8047f0
commit 6654bb9204
6 changed files with 54 additions and 35 deletions
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4
doc/src/sgml/wal.sgml
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@@ -841,8 +841,8 @@
The <xref linkend="guc-maintenance-io-concurrency"/> and
<xref linkend="guc-wal-decode-buffer-size"/> settings limit prefetching
concurrency and distance, respectively. By default, it is set to
<literal>try</literal>, which enables the feature on systems where
<function>posix_fadvise</function> is available.
<literal>try</literal>, which enables the feature on systems that support
issuing read-ahead advice.
</para>
</sect1>