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Increase hash_mem_multiplier default to 2.0.

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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
This commit is contained in:
Peter Geoghegan
2022-02-16 18:41:52 -08:00
parent 74388a1ac3
commit 8f388f6f55
10 changed files with 52 additions and 9 deletions
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src/backend/utils/init/globals.c
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@@ -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;