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Add a multi-worker capability to autovacuum. This allows multiple worker

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processes to be running simultaneously.  Also, now autovacuum processes do not
count towards the max_connections limit; they are counted separately from
regular processes, and are limited by the new GUC variable
autovacuum_max_workers.

The launcher now has intelligence to launch workers on each database every
autovacuum_naptime seconds, limited only on the max amount of worker slots
available.

Also, the global worker I/O utilization is limited by the vacuum cost-based
delay feature.  Workers are "balanced" so that the total I/O consumption does
not exceed the established limit.  This part of the patch was contributed by
ITAGAKI Takahiro.

Per discussion.
This commit is contained in:
Alvaro Herrera
2007-04-16 18:30:04 +00:00
parent 42dc4b66e6
commit e2a186b03c
12 changed files with 1174 additions and 162 deletions
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9
src/backend/utils/init/globals.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/init/globals.c,v 1.100 2007/01/05 22:19:44 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/globals.c,v 1.101 2007/04/16 18:29:54 alvherre Exp $
*
* NOTES
* Globals used all over the place should be declared here and not
@@ -95,9 +95,14 @@ bool allowSystemTableMods = false;
int work_mem = 1024;
int maintenance_work_mem = 16384;
/* Primary determinants of sizes of shared-memory structures: */
/*
* Primary determinants of sizes of shared-memory structures. MaxBackends is
* MaxConnections + autovacuum_max_workers (it is computed by the GUC assign
* hook):
*/
int NBuffers = 1000;
int MaxBackends = 100;
int MaxConnections = 90;
int VacuumCostPageHit = 1; /* GUC parameters for vacuum */
int VacuumCostPageMiss = 10;