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Alvaro Herrera e2a186b03c 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.
2007-04-16 18:30:04 +00:00
..
backendid.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
block.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
buf.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
buf_internals.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
buffile.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
bufmgr.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
bufpage.h Suppress useless searches for unused line pointers in PageAddItem. To do 2007-03-02 00:48:44 +00:00
fd.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
freespace.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
ipc.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
item.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
itemid.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
itempos.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
itemptr.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
large_object.h Add lo_truncate() to backend and libpq for large object truncation. 2007-03-03 19:52:47 +00:00
lmgr.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
lock.h Add GUC log_lock_waits to log long wait times. 2007-03-03 18:46:40 +00:00
lwlock.h Add a multi-worker capability to autovacuum. This allows multiple worker 2007-04-16 18:30:04 +00:00
off.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
pg_sema.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
pg_shmem.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
pmsignal.h Restructure autovacuum in two processes: a dummy process, which runs 2007-02-15 23:23:23 +00:00
pos.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
proc.h Add a multi-worker capability to autovacuum. This allows multiple worker 2007-04-16 18:30:04 +00:00
procarray.h Remove the CheckpointStartLock in favor of having backends show whether they 2007-04-03 16:34:36 +00:00
relfilenode.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
s_lock.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
shmem.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
sinval.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
sinvaladt.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00
smgr.h Extend yesterday's patch so that the bgwriter is also told to forget 2007-01-17 16:25:01 +00:00
spin.h Update CVS HEAD for 2007 copyright. Back branches are typically not 2007-01-05 22:20:05 +00:00