Peter Eisentraut wrote:
> Bruce Momjian wrote:
> > This patch disables page writes to WAL when fsync is off, because
> > with no fsync guarantee, the page write recovery isn't useful.
> >
> > This also adds a full_page_writes GUC to turn off page writes to WAL.
> > Some people might not want full_page_writes, but still might want
> > fsync.
>
> Do you have some numbers to suggest that there is a performance benefit
> to be had?
Josh reported page writes to be a big hit (which we already knew), but I
don't have any with fsync off, though it seems like a no-brainer.
However, I am thinking decoupling them is best.
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073