diff options
| author | Peter Geoghegan | 2022-02-17 02:41:52 +0000 |
|---|---|---|
| committer | Peter Geoghegan | 2022-02-17 02:41:52 +0000 |
| commit | 8f388f6f554b113f25a53fe3237238d2c58ed1eb (patch) | |
| tree | 2366a367511bb0dd101bd46a5a08428a215319cd /src/backend | |
| parent | 74388a1ac36d2f0206c5477eeddc636d7947a5a4 (diff) | |
Increase hash_mem_multiplier default to 2.0.
Double the default setting for hash_mem_multiplier, from 1.0 to 2.0.
This setting makes hash-based executor nodes use twice the usual
work_mem limit.
The PostgreSQL 15 release notes should have a compatibility note about
this change.
Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-Wzndc_ROk6CY-bC6p9O53q974Y0Ey4WX8jcPbuTZYM4Q3A@mail.gmail.com
Diffstat (limited to 'src/backend')
| -rw-r--r-- | src/backend/utils/init/globals.c | 2 | ||||
| -rw-r--r-- | src/backend/utils/misc/guc.c | 2 | ||||
| -rw-r--r-- | src/backend/utils/misc/postgresql.conf.sample | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c index c26a1a73df8..3419c099b28 100644 --- a/src/backend/utils/init/globals.c +++ b/src/backend/utils/init/globals.c @@ -122,7 +122,7 @@ int IntervalStyle = INTSTYLE_POSTGRES; bool enableFsync = true; bool allowSystemTableMods = false; int work_mem = 4096; -double hash_mem_multiplier = 1.0; +double hash_mem_multiplier = 2.0; int maintenance_work_mem = 65536; int max_parallel_maintenance_workers = 2; diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c index 9d0208ec98a..01f373815e0 100644 --- a/src/backend/utils/misc/guc.c +++ b/src/backend/utils/misc/guc.c @@ -3762,7 +3762,7 @@ static struct config_real ConfigureNamesReal[] = GUC_EXPLAIN }, &hash_mem_multiplier, - 1.0, 1.0, 1000.0, + 2.0, 1.0, 1000.0, NULL, NULL, NULL }, diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index 56d0bee6d9b..4a094bb38be 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -136,7 +136,7 @@ # Caution: it is not advisable to set max_prepared_transactions nonzero unless # you actively intend to use prepared transactions. #work_mem = 4MB # min 64kB -#hash_mem_multiplier = 1.0 # 1-1000.0 multiplier on hash table work_mem +#hash_mem_multiplier = 2.0 # 1-1000.0 multiplier on hash table work_mem #maintenance_work_mem = 64MB # min 1MB #autovacuum_work_mem = -1 # min 1MB, or -1 to use maintenance_work_mem #logical_decoding_work_mem = 64MB # min 64kB |