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Default to wal_sync_method=fdatasync on FreeBSD.

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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 576477e73c, 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
This commit is contained in:
Thomas Munro
2021-02-15 15:43:39 +13:00
parent 840eda04eb
commit a27f3a7f41
3 changed files with 11 additions and 2 deletions
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2
src/backend/utils/misc/postgresql.conf.sample
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@ -200,7 +200,7 @@
#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