On Mon, Dec 6, 2010 at 9:04 PM, Josh Berkus <j...@agliodbs.com> wrote: > >> Mac OS X: Like Solaris, there's a similar mechanism but it's not >> O_DIRECT; see >> http://stackoverflow.com/questions/2299402/how-does-one-do-raw-io-on-mac-os-x-ie-equivalent-to-linuxs-o-direct-flag >> for notes about the F_NOCACHE feature used. Same basic situation as >> Solaris; there's an API, but PostgreSQL doesn't use it yet. > > Actually, on OSX 10.5.8, o_dsync and fdatasync aren't even available. > From my run, it looks like even so regular fsync might be better than > open_sync.
But I think you need to use fsync_writethrough if you actually want durability. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
