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Add parallel_leader_participation GUC.

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Sometimes, for testing, it's useful to have the leader do nothing but
read tuples from workers; and it's possible that could work out better
even in production.

Thomas Munro, reviewed by Amit Kapila and by me.  A few final tweaks
by me.

Discussion: http://postgr.es/m/CAEepm=2U++Lp3bNTv2Bv_kkr5NE2pOyHhxU=G0YTa4ZhSYhHiw@mail.gmail.com
This commit is contained in:
Robert Haas
2017-11-15 08:17:29 -05:00
parent 7518049980
commit e5253fdc4f
10 changed files with 205 additions and 9 deletions
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src/backend/utils/misc/postgresql.conf.sample
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@ -163,6 +163,7 @@
#effective_io_concurrency = 1 # 1-1000; 0 disables prefetching
#max_worker_processes = 8 # (change requires restart)
#max_parallel_workers_per_gather = 2 # taken from max_parallel_workers
#parallel_leader_particulation = on
#max_parallel_workers = 8 # maximum number of max_worker_processes that
# can be used in parallel queries
#old_snapshot_threshold = -1 # 1min-60d; -1 disables; 0 is immediate