Hi, 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
