On Tue, Oct 17, 2017 at 7:27 AM, Thomas Munro <thomas.mu...@enterprisedb.com> wrote: > While testing parallelism work I've wanted to be able to prevent > gather nodes from running the plan in the leader process, and I've > heard others say the same. One way would be to add a GUC > "multiplex_gather", like in the attached patch. If you set it to off, > Gather and Gather Merge won't run the subplan unless they have to > because no workers could be launched. I thought about adding a new > value for force_parallel_mode instead, but someone mentioned they > might want to do this on a production system too and > force_parallel_mode is not really for end users. Better ideas?
I don't think overloading force_parallel_mode is a good idea, but having some other GUC for this seems OK to me. Not sure I like multiplex_gather, though. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers