Tom Lane wrote:
> "Heikki Linnakangas" <heikki@enterprisedb.com> writes:
>> * mmap the WAL segments, instead of using the slru buffers.
>
> This one's almost certainly a nonstarter, for lack of any portable way
> to control when writes happen.
For flushing, there's msync, which I believe is quite portable.
We mustn't write data pages before the WAL hits the disk, but we don't
have any such limitation for WAL.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com