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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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1
src/backend/utils/misc/postgresql.conf.sample
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@ -376,6 +376,7 @@
#autovacuum = on # enable autovacuum subprocess?
# 'on' requires stats_start_collector
# and stats_row_level to also be on
#autovacuum_max_workers = 3 # max # of autovacuum subprocesses
#autovacuum_naptime = 1min # time between autovacuum runs
#autovacuum_vacuum_threshold = 500 # min # of tuple updates before
# vacuum