"Pavel Stehule" <[EMAIL PROTECTED]> writes:
> I was little bit surprised. Is any reason for it?
Are you sure you're comparing apples to apples? In particular the
default autovacuuming setup is entirely different. With autovac off
I see 8.3 as faster than 8.2 in pgbench.
Also, remember a couple rules of thumb for choosing pgbench parameters:
keep -c less than the -s scale factor you used for pgbench -i (otherwise
you're mostly measuring update contention, because there are only -s
different rows in the branches table); and use -t at least 1000 or so
(otherwise startup transients are significant).
Note to all: we ***HAVE TO*** settle on some reasonable default
vacuum_cost_delay settings before we can ship 8.3. With no cost delay
and two or three workers active, 8.3's autovac does indeed send
performance into the tank.
regards, tom lane
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