"Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> writes:
> We mustn't write data pages before the WAL hits the disk, but we don't
> have any such limitation for WAL.
Um, you're right, I was remembering discussions about trying to mmap
data files. Still, googling "msync performance" leaves me full of
concern about whether this would be a portable improvement.
regards, tom lane