| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Neil Conway <neilc(at)samurai(dot)com> |
| Cc: | pgsql-committers(at)postgresql(dot)org |
| Subject: | Re: pgsql-server/ oc/src/sgml/runtime.sgml rc/back ... |
| Date: | 2004-01-22 02:29:17 |
| Message-ID: | 8911.1074738557@sss.pgh.pa.us |
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| Lists: | pgsql-committers |
Neil Conway <neilc(at)samurai(dot)com> writes:
> tgl(at)svr1(dot)postgresql(dot)org (Tom Lane) writes:
>> Repair error apparently introduced in the initial coding of GUC: the
>> default value for geqo_effort is supposed to be 40, not 1. The actual
>> 'genetic' component of the GEQO algorithm has been practically disabled
>> since 7.1 because of this mistake.
> Is this worth considering for a backport to the 7.4 branch?
Considering it's been broken for several releases and no one noticed,
I'm not sure it's critical. This is just something I noticed while
looking at Mike's recent complaint that GEQO is too slow. This change
actually makes it slower :-( but I'm hoping to find that we can buy
that back with other improvements.
regards, tom lane
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