diff options
| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2007-04-16 18:30:04 +0000 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2007-04-16 18:30:04 +0000 |
| commit | e2a186b03cc1a87cf26644db18f28a20f10bd739 (patch) | |
| tree | a11e944e89e9757808f6d86dc9aa79ea6a94948a /src/backend/utils/init | |
| parent | 42dc4b66e61cde4beb466561f12fd490b6621ee3 (diff) | |
Add a multi-worker capability to autovacuum. This allows multiple worker
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.
Diffstat (limited to 'src/backend/utils/init')
| -rw-r--r-- | src/backend/utils/init/globals.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c index 130244b5e55..b5b11500566 100644 --- a/src/backend/utils/init/globals.c +++ b/src/backend/utils/init/globals.c @@ -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; |