Horton

Re: Direct I/O

Thomas Munro <thomas.munro@gmail.com>

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From: Thomas Munro <thomas.munro@gmail.com>
To: Peter Eisentraut <peter@eisentraut.org>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Justin Pryzby <pryzby@telsasoft.com>, Noah Misch <noah@leadboat.com>, Robert Haas <robertmhaas@gmail.com>, Andres Freund <andres@anarazel.de>, Andrew Dunstan <andrew@dunslane.net>, Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>, Christoph Berg <myon@debian.org>, mikael.kjellstrom@gmail.com, pgsql-hackers@postgresql.org
Date: 2023-08-23T04:57:43Z
Lists: pgsql-hackers 
On Wed, Aug 23, 2023 at 12:15 AM Peter Eisentraut <peter@eisentraut.org> wrote:
> I suggest to also rename the hook functions (check and assign), like in
> the attached patch.  Mainly because utils/guc_hooks.h says to order the
> functions by GUC variable name, which was already wrong under the old
> name, but it would be pretty confusing to sort the functions by their
> GUC name that doesn't match the function names.

OK.  I'll push this tomorrow unless you do it while I'm asleep.  Thanks!

Commits

  1. Rename hook functions for debug_io_direct to match variable name.

  2. Rename io_direct to debug_io_direct.

  3. Skip the 004_io_direct.pl test if a pre-flight check fails.

  4. Use higher wal_level for 004_io_direct.pl.

  5. Skip \password TAP test on old IPC::Run versions

  6. Add io_direct setting (developer-only).

  7. Introduce PG_IO_ALIGN_SIZE and align all I/O buffers.

  8. Add palloc_aligned() to allow aligned memory allocations

  9. initdb: When running CREATE DATABASE, use STRATEGY = WAL_COPY.