Jakub Ouhrabka wrote: > > Maybe you should decrease naptime a bit. > > That did the trick, thanks! > > > Yes. There were some changes that needed to be done to autovacuum so > > that it didn't read the stats file too often, but I don't recall if I > > got around to it. > > I looked at the strace output and there are *writes* to the file not > reads. Why? Is it a consequence of this optimization? > > Release notes 8.4: > > Reduce I/O load of writing the statistics collection file by writing > the file only when requested (Martin Pihlak) > > Was autovacuum requesting to write this 20MB file 650x per minute?
Yes, exactly. Ideally, autovacuum would only request a new copy of the file if the one it got was considerably out of date. Obviously a tenth of a second is not old enough. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
