| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | "Henry B(dot) Hotz" <hotz(at)jpl(dot)nasa(dot)gov> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] Some notes on optimizer cost estimates |
| Date: | 2000-01-25 23:16:15 |
| Message-ID: | Pine.LNX.4.21.0001250051290.525-100000@localhost.localdomain |
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| Lists: | pgsql-hackers |
On 2000-01-24, Henry B. Hotz mentioned:
> >to be useful for cost estimating. We could make it a parameter like
> >we do for CPU_PAGE_WEIGHT ... but you know and I know that no one
> >ever bothers to adjust those numbers in the field ...
> Couldn't we test some of these parameters inside configure and set them there?
Nope. configure is for testing the build environment, not the runtime
environment. But the same thing could be achieved with some
runtime-analyzing program that writes its results into some sort of
configuration file.
--
Peter Eisentraut Sernanders väg 10:115
peter_e(at)gmx(dot)net 75262 Uppsala
http://yi.org/peter-e/ Sweden
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