On Mon, 5 May 2008, Craig James wrote:
pgbench -i -s 20 -U test
That's way too low to expect you'll see a difference in I/O schedulers. A scale of 20 is giving you a 320MB database, you can fit the whole thing in RAM and almost all of it on your controller cache. What's there to schedule? You're just moving between buffers that are generally large enough to hold most of what they need.
pgbench -c 10 -t 50000 -v -U test
This is OK, because when you increase the size you're not going to be pushing 3500 TPS anymore and this test will take quite a while.
-- * Greg Smith gsmith@xxxxxxxxxxxxx http://www.gregsmith.com Baltimore, MD
