On Mon, Apr 13, 2020 at 4:16 PM Andres Freund <andres@anarazel.de> wrote:
> I don't think so. If only one process does the splitting, the
> exclusively locked section is just popping off a bunch of offsets of the
> ring. And that could fairly easily be done with atomic ops (since what
> we need is basically a single producer multiple consumer queue, which
> can be done lock free fairly easily ). Whereas in the case of each
> process doing the splitting, the exclusively locked part is splitting
> along lines - which takes considerably longer than just popping off a
> few offsets.
Hmm, that does seem believable.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company