On Thu, 1 Jan 2009, Robert Haas wrote:
The only thing I haven't been able to do is demonstrate that this change actually produces a performance improvement. Either I'm testing the wrong thing, or it just doesn't provide any benefit on a single-spindle system.
When I did a round of testing on the earlier prefetch test program Greg Stark put together, one of my single-spindle Linux system didn't show any real benefit. So as long as you didn't see performance degrade, your not seeing any improvement isn't bad news.
I've got a stack of hardware I can do performance testing of this patch on, what I haven't been able to find time for is setting up any sort of test harness right now. If you or Greg have any benchmark or test program you could suggest that should show off the improvements here, I'd be glad to run it on a bunch of systems and report back--I've already got a stack of candidate ones I ran the earlier tests on to compare results against.
-- * Greg Smith gsm...@gregsmith.com http://www.gregsmith.com Baltimore, MD -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
