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Reduce the default for max_worker_processes back to 8.

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Commit b460f5d6693103076dc554aa7cbb96e1e53074f9 -- at my suggestion --
increased the default value of max_worker_processes from 8 to 16, on
the theory that this would be harmless and convenient for users.
Unfortunately, this caused some buildfarm machines with low connection
limits to start failing, so apparently it's not harmless after all.
This commit is contained in:
Robert Haas 2016-12-05 10:53:21 -05:00
parent 88f626f868
commit 2b959d4957
5 changed files with 6 additions and 6 deletions
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2
doc/src/sgml/config.sgml
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@ -1982,7 +1982,7 @@ include_dir 'conf.d'
<para>
Sets the maximum number of background processes that the system
can support. This parameter can only be set at server start. The
default is 16.
default is 8.
</para>
<para>

2
src/backend/utils/init/globals.c
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@ -121,7 +121,7 @@ int replacement_sort_tuples = 150000;
*/
int NBuffers = 1000;
int MaxConnections = 90;
int max_worker_processes = 16;
int max_worker_processes = 8;
int max_parallel_workers = 8;
int MaxBackends = 0;

2
src/backend/utils/misc/guc.c
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@ -2477,7 +2477,7 @@ static struct config_int ConfigureNamesInt[] =
NULL,
},
&max_worker_processes,
16, 0, MAX_BACKENDS,
8, 0, MAX_BACKENDS,
check_max_worker_processes, NULL, NULL
},

2
src/backend/utils/misc/postgresql.conf.sample
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@ -161,7 +161,7 @@
# - Asynchronous Behavior -
#effective_io_concurrency = 1 # 1-1000; 0 disables prefetching
#max_worker_processes = 16 # (change requires restart)
#max_worker_processes = 8 # (change requires restart)
#max_parallel_workers_per_gather = 2 # taken from max_worker_processes
#max_parallel_workers = 8 # total maximum number of worker_processes
#old_snapshot_threshold = -1 # 1min-60d; -1 disables; 0 is immediate

4
src/bin/pg_resetxlog/pg_resetxlog.c
View File

@ -584,7 +584,7 @@ GuessControlValues(void)
ControlFile.wal_log_hints = false;
ControlFile.track_commit_timestamp = false;
ControlFile.MaxConnections = 100;
ControlFile.max_worker_processes = 16;
ControlFile.max_worker_processes = 8;
ControlFile.max_prepared_xacts = 0;
ControlFile.max_locks_per_xact = 64;
@ -800,7 +800,7 @@ RewriteControlFile(void)
ControlFile.wal_log_hints = false;
ControlFile.track_commit_timestamp = false;
ControlFile.MaxConnections = 100;
ControlFile.max_worker_processes = 16;
ControlFile.max_worker_processes = 8;
ControlFile.max_prepared_xacts = 0;
ControlFile.max_locks_per_xact = 64;