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Improve defaults shown in postgresql.conf.sample and pg_settings

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Previously, these showed unlikely default values.  The new default value
128MB (since PG 10) is not always accurate since initdb tries several
increasing values, but it likely to be accurate.

Reported-by: Zhangjie <zhangjie2@fujitsu.com>

Discussion: https://postgr.es/m/TYWPR01MB7678772FD8640C404F1DC882F9079@TYWPR01MB7678.jpnprd01.prod.outlook.com

Author: Zhangjie

Backpatch-through: master
This commit is contained in:
Bruce Momjian 2021-08-23 12:33:38 -04:00
parent a3fcbcda75
commit f7bda63a48
3 changed files with 3 additions and 3 deletions
src
backend/utils/misc
guc.cpostgresql.conf.sample
bin/initdb
initdb.c

2
src/backend/utils/misc/guc.c

@ -2333,7 +2333,7 @@ static struct config_int ConfigureNamesInt[] =
GUC_UNIT_BLOCKS GUC_UNIT_BLOCKS
}, },
&NBuffers, &NBuffers,
1024, 16, INT_MAX / 2, 16384, 16, INT_MAX / 2,
NULL, NULL, NULL NULL, NULL, NULL
}, },

2
src/backend/utils/misc/postgresql.conf.sample

@ -124,7 +124,7 @@
# - Memory - # - Memory -
#shared_buffers = 32MB # min 128kB #shared_buffers = 128MB # min 128kB
# (change requires restart) # (change requires restart)
#huge_pages = try # on, off, or try #huge_pages = try # on, off, or try
# (change requires restart) # (change requires restart)

2
src/bin/initdb/initdb.c

@ -1071,7 +1071,7 @@ setup_config(void)
else else
snprintf(repltok, sizeof(repltok), "shared_buffers = %dkB", snprintf(repltok, sizeof(repltok), "shared_buffers = %dkB",
n_buffers * (BLCKSZ / 1024)); n_buffers * (BLCKSZ / 1024));
conflines = replace_token(conflines, "#shared_buffers = 32MB", repltok); conflines = replace_token(conflines, "#shared_buffers = 128MB", repltok);
#ifdef HAVE_UNIX_SOCKETS #ifdef HAVE_UNIX_SOCKETS
snprintf(repltok, sizeof(repltok), "#unix_socket_directories = '%s'", snprintf(repltok, sizeof(repltok), "#unix_socket_directories = '%s'",