From: | Peter Geoghegan <peter(at)2ndquadrant(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Noah Misch <noah(at)leadboat(dot)com>, Jay Levitt <jay(dot)levitt(at)gmail(dot)com>, "Jim Decibel! Nasby" <decibel(at)decibel(dot)org>, Bruce Momjian <bruce(at)momjian(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Progress on fast path sorting, btree index creation time |
Date: | 2012-02-16 00:02:48 |
Message-ID: | CAEYLb_XQF6guOVgtR=4u7oTPWZGpr6GpD7AgUOofE1b6ixM+eA@mail.gmail.com |
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On 15 February 2012 15:27, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> I am inclined to agree that given that we already use Perl to generate
>> source code like this, it seems natural that we should prefer to do
>> that, if only to avoid paranoia about the inclusion of a dial-a-bloat
>> knob. I am at a disadvantage here, since I've never written a line of
>> Perl.
>
> I think it's still dial-a-bloat, but I feel pretty comfortable about
> how we've got that knob adjusted in this version. It's almost as much
> improvement as any previous version, it applies to more cases, and the
> code footprint is the least of any version I've measured.
I'm happy that the principle that a dial-a-bloat knob isn't
necessarily a bad thing has been accepted, though that term is kind of
pejorative in that it implies that the knob necessarily adds bloat to
the binary.
I define bloat here as the addition of dead instructions to the
binary, or at least code that doesn't pull its weight. Clearly, that
isn't the case here, and I suspect that we will find that it isn't the
case in other places too.
--
Peter Geoghegan http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training and Services
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