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Disable parallel query by default.

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Per discussion, set the default value of max_parallel_workers_per_gather
to 0 in 9.6 only.  We'll leave it enabled in master so that it gets
more testing and in the hope that it can be enable by default in v10.
This commit is contained in:
Robert Haas
2016-08-16 08:09:15 -04:00
parent b5bce6c1ec
commit f85b1a8415
4 changed files with 4 additions and 4 deletions
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2
src/backend/optimizer/path/costsize.c
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@@ -113,7 +113,7 @@ int effective_cache_size = DEFAULT_EFFECTIVE_CACHE_SIZE;
Cost disable_cost = 1.0e10;
int max_parallel_workers_per_gather = 2;
int max_parallel_workers_per_gather = 0;
bool enable_seqscan = true;
bool enable_indexscan = true;

2
src/backend/utils/misc/guc.c
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@@ -2652,7 +2652,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&max_parallel_workers_per_gather,
2, 0, 1024,
0, 0, 1024,
NULL, NULL, NULL
},

2
src/backend/utils/misc/postgresql.conf.sample
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@@ -163,7 +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_worker_processes
#max_parallel_workers_per_gather = 0 # taken from max_worker_processes
#old_snapshot_threshold = -1 # 1min-60d; -1 disables; 0 is immediate
# (change requires restart)
#backend_flush_after = 0 # 0 disables, default is 0