From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Remove configure --disable-float4-byval and --disable-float8-byval |
Date: | 2019-11-01 18:00:10 |
Message-ID: | 15314.1572631210@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Peter Geoghegan <pg(at)bowt(dot)ie> writes:
> On Fri, Nov 1, 2019 at 7:41 AM Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> Could we get around this by making Datum 8 bytes everywhere?
> I really like that idea.
> Even Raspberry Pi devices (which can cost as little as $35) use 64-bit
> ARM processors. It's abundantly clear that 32-bit platforms do not
> matter enough to justify keeping all the SIZEOF_DATUM crud around.
This line of argument seems to me to be the moral equivalent of
"let's drop 32-bit support altogether". I'm not entirely on board
with that. Certainly, a lot of the world is 64-bit these days,
but people are still building small systems and they might want
a database; preferably one that hasn't been detuned to the extent
that it barely manages to run at all on such a platform. Making
a whole lot of internal APIs 64-bit would be a pretty big hit for
a 32-bit platform --- more instructions, more memory consumed for
things like Datum arrays, all in a memory space that's not that big.
It seems especially insane to conclude that we should pull the plug
on such use-cases just to get rid of one obscure configure option.
If we were expending any significant devel effort on supporting
32-bit platforms, I might be ready to drop support, but we're not.
(Robert's proposal looks to me like it's actually creating new work
to do, not saving work.)
regards, tom lane
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