Re: Plan time Improvement - 64bit bitmapset

From: Andres Freund <andres(at)anarazel(dot)de>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: pgsql-hackers(at)postgresql(dot)org, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: Plan time Improvement - 64bit bitmapset
Date: 2009-06-10 17:40:16
Message-ID: 4A2FF000.5070304@anarazel.de
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Hi,

On 06/10/2009 06:01 PM, Kevin Grittner wrote:
> Andres Freund<andres(at)anarazel(dot)de> wrote:
>> - Sometimes adding a single join more/less dropped the planning time
>> to a fraction - strange.
>> - The same with changing {join,from}_collapse_limit - sometimes
>> changing it yields plan times different by orders of magnitudes in
>> both directions.
> That seems like the place to spend the time looking, rather than
> nibbling away at the run times by a few percent after letting them
> jump by orders of magnitude.
Yes. I noticed this while looking for reasons. And I will continue to do
so...

Andres

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