Re: Proposed LogWriter Scheme, WAS: Potential Large Performance Gain in WAL synching

Tom Lane <tgl@sss.pgh.pa.us> writes:

> "Curtis Faith" <curtis@galtair.com> writes:

> > The log file would be opened O_DSYNC, O_APPEND every time.
> 
> Keep in mind that we support platforms without O_DSYNC.  I am not
> sure whether there are any that don't have O_SYNC either, but I am
> fairly sure that we measured O_SYNC to be slower than fsync()s on
> some platforms.

And don't we preallocate WAL files anyway?  So O_APPEND would be
irrelevant?

-Doug