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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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3
src/include/miscadmin.h
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@ -13,7 +13,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.193 2007/03/01 14:52:04 petere Exp $
* $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.194 2007/04/16 18:29:56 alvherre Exp $
*
* NOTES
* some of the information in this file should be moved to other files.
@ -129,6 +129,7 @@ extern DLLIMPORT char *DataDir;
extern DLLIMPORT int NBuffers;
extern int MaxBackends;
extern int MaxConnections;
extern DLLIMPORT int MyProcPid;
extern DLLIMPORT struct Port *MyProcPort;