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| author | Thomas Munro <tmunro@postgresql.org> | 2021-02-15 15:43:39 +1300 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2021-02-15 16:08:24 +1300 |
| commit | 800131df74c4b870b6a459bcee0acc0bb89f75ff (patch) | |
| tree | d03231467c69c1d1d4d09ae393b1e4d59d3646ec | |
| parent | 4b426f77c3cf7fab24115ddb99174d1efa311aee (diff) | |
| download | postgresql-800131df74c4b870b6a459bcee0acc0bb89f75ff.tar.gz postgresql-800131df74c4b870b6a459bcee0acc0bb89f75ff.zip | |
Default to wal_sync_method=fdatasync on FreeBSD.
FreeBSD 13 gained O_DSYNC, which would normally cause wal_sync_method to
choose open_datasync as its default value. That may not be a good
choice for all systems, and performs worse than fdatasync in some
scenarios. Let's preserve the existing default behavior for now.
Like commit 576477e73c4, which did the same for Linux, back-patch to all
supported releases.
Discussion: https://postgr.es/m/CA%2BhUKGLsAMXBQrCxCXoW-JsUYmdOL8ALYvaX%3DCrHqWxm-nWbGA%40mail.gmail.com
| -rw-r--r-- | doc/src/sgml/config.sgml | 4 | ||||
| -rw-r--r-- | src/backend/utils/misc/postgresql.conf.sample | 2 | ||||
| -rw-r--r-- | src/include/port/freebsd.h | 9 |
3 files changed, 12 insertions, 3 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 75cd8a42fac..159aedb99ce 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -2537,8 +2537,8 @@ include_dir 'conf.d' The <literal>open_</>* options also use <literal>O_DIRECT</> if available. Not all of these choices are available on all platforms. The default is the first method in the above list that is supported - by the platform, except that <literal>fdatasync</> is the default on - Linux. The default is not necessarily ideal; it might be + by the platform, except that <literal>fdatasync</literal> is the default on + Linux and FreeBSD. The default is not necessarily ideal; it might be necessary to change this setting or other aspects of your system configuration in order to create a crash-safe configuration or achieve optimal performance. diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index ee3b5e1774d..5860f18885b 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -187,7 +187,7 @@ #wal_sync_method = fsync # the default is the first option # supported by the operating system: # open_datasync - # fdatasync (default on Linux) + # fdatasync (default on Linux and FreeBSD) # fsync # fsync_writethrough # open_sync diff --git a/src/include/port/freebsd.h b/src/include/port/freebsd.h index 2e36d3da4f4..2e2e749a6b6 100644 --- a/src/include/port/freebsd.h +++ b/src/include/port/freebsd.h @@ -1 +1,10 @@ /* src/include/port/freebsd.h */ + +/* + * Set the default wal_sync_method to fdatasync. xlogdefs.h's normal rules + * would prefer open_datasync on FreeBSD 13+, but that is not a good choice on + * many systems. + */ +#ifdef HAVE_FDATASYNC +#define PLATFORM_DEFAULT_SYNC_METHOD SYNC_METHOD_FDATASYNC +#endif |