Re: Strangely Variable Query Performance

From: Steve <cheetah(at)tanabi(dot)org>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Scott Marlowe <smarlowe(at)g2switchworks(dot)com>, PostgreSQL Performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Strangely Variable Query Performance
Date: 2007-04-12 23:28:02
Message-ID: Pine.GSO.4.64.0704121925280.17955@kittyhawk.tanabi.org
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers pgsql-patches pgsql-performance

It's a redhat enterprise machine running AMD x64 processors.

Linux ers3.dddcorp.com 2.6.9-42.0.10.ELsmp #1 SMP Fri Feb 16 17:13:42 EST
2007 x86_64 x86_64 x86_64 GNU/Linux

It was compiled by me, straight up, nothing weird at all, no odd compiler
options or wahtever :)

So yeah :/ I'm quite baffled as well,

Talk to you later,

Steve

On Thu, 12 Apr 2007, Tom Lane wrote:

> Steve <cheetah(at)tanabi(dot)org> writes:
>> Here's my planner parameters:
>
> I copied all these, and my 8.2.x still likes the bitmap scan a lot
> better than the seqscan. Furthermore, I double-checked the CVS history
> and there definitely haven't been any changes in that area in REL8_2
> branch since 8.2.3. So I'm a bit baffled. Maybe the misbehavior is
> platform-specific ... what are you on exactly? Is there anything
> nonstandard about your Postgres installation?
>
> regards, tom lane
>

In response to

Browse pgsql-hackers by date

  From Date Subject
Next Message Tom Lane 2007-04-12 23:29:09 Re: Strangely Variable Query Performance
Previous Message Tom Lane 2007-04-12 23:00:09 Re: Strangely Variable Query Performance

Browse pgsql-patches by date

  From Date Subject
Next Message Tom Lane 2007-04-12 23:29:09 Re: Strangely Variable Query Performance
Previous Message Tom Lane 2007-04-12 23:00:09 Re: Strangely Variable Query Performance

Browse pgsql-performance by date

  From Date Subject
Next Message Tom Lane 2007-04-12 23:29:09 Re: Strangely Variable Query Performance
Previous Message Tom Lane 2007-04-12 23:00:09 Re: Strangely Variable Query Performance