Dimitri Fontaine wrote:
> Exactly the point. The process is now already waiting in all cases, so maybe
> we could just force waiting some WALSender signal before sending the fsync()
> order, so we now have Group Commit.
A single process can only wait on either fsync() or on select(), but not
on both concurrently, because both syscalls are blocking. So mixing
these into a single process is an inherently bad idea due to lack of
parallelism.
I fail to see how log shipping would ease or have any other impact on a
Group Commit feature, which should clearly also work for stand alone
servers, i.e. where there is no WAL sender process.
Regards
Markus Wanner
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
No comments:
Post a Comment