Read the developer's FAQ on advanced features. We don't think it will be a big win.
--------------------------------------------------------------------------- Ruslan A Dautkhanov wrote: > Hello, > > In the FreeBSD 4.5 appear additional O_DIRECT option for open(2), > which mean "eliminate or reduce cache effects". I think, that double > buffering the same disk blocks is ineffective. I grepped all > PostgreSQL sources for this options and didn't find this anywhere. > PgSQL have it's own disk caches, which should be smart > (DB can know what data should be cached first better than OS). > Why wasting OS memory for double caches? OS can use this caches > for other disk blocks, so total cached disk blocks in whole > system will be much bigger. If you have no plans to implement this, > please let us know what source files I should looking for patching. > I think it's somewhere DB tables files are opened (and maybe > WAL files too). Thanks a lot on any comments. > > > > --- > best regards, > Ruslan A Dautkhanov [EMAIL PROTECTED] -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])
