On 01/18/2011 06:44 PM, Robert Haas wrote:
On Tue, Jan 18, 2011 at 9:24 AM, Merlin Moncure<mmonc...@gmail.com> wrote:
a few weeks back I hacked an experimental patch that removed the hint
bit action completely. the results were very premature and/or
incorrect, but my initial findings suggested that hint bits might not
be worth the cost from performance standpoint. i'd like to see some
more investigation in this direction before going with a complex
application mechanism (although that would be beneficial vs the status
quo).
I think it's not very responsible to allege that hint bits aren't
providing a benefit without providing the patch that you used and the
tests that you ran.
maybe I'm wrong but it seems it did post an experimental patch and also
a tests used, see:
http://archives.postgresql.org/pgsql-hackers/2010-12/msg01897.php
> This is a topic that needs careful analysis, and
> I think that saying "hint bits don't provide a benefit... maybe..."
> doesn't do anything but confuse the issue. How about doing some tests
> with the patch from my OP and posting the results? If removing hint
> bits entirely doesn't degrade performance, then surely the
> less-drastic approach I've taken here ought to be OK too. But in my
> testing, it didn't look too good.
>
Andrea
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