Re: Re[2]: Allowing WAL fsync to be done via O_SYNC

* Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> [010316 07:11] wrote:
> > > Could anyone consider fork a syncer process to sync data to disk ?
> > > build a shared sync queue, when a daemon process want to do sync after
> > > write() is called, just put a sync request to the queue. this can release
> > > process from blocked on writing as soon as possible. multipile sync
> > > request for one file can be merged when the request is been inserting to
> > > the queue.
> >
> > I suggested this about a year ago. :)
> >
> > The problem is that you need that process to potentially open and close
> > many files over and over.
> >
> > I still think it's somewhat of a good idea.
>
> I like the idea too, but people want the transaction to return COMMIT
> only after data has been fsync'ed so I don't see a big win.

This isn't simply handing off the sync to this other process, it requires
an ack from the syncer before returning 'COMMIT'.

--
-Alfred Perlstein - [bright(at)wintelcom(dot)net|alfred(at)freebsd(dot)org]