From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
Cc: | Andres Freund <andres(at)anarazel(dot)de>, Noah Misch <noah(at)leadboat(dot)com>, Hans Buschmann <buschmann(at)nidsa(dot)net>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Proposal: Removing 32 bit support starting from PG17++ |
Date: | 2023-05-25 00:34:38 |
Message-ID: | 1361048.1684974878@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Thomas Munro <thomas(dot)munro(at)gmail(dot)com> writes:
> On Thu, May 25, 2023 at 11:51 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> You'll no doubt be glad to hear that I'll be retiring chickadee
>> in the very near future.
> . o O { I guess chickadee might have been OK anyway, along with e.g.
> antique low-end SGI MIPS gear etc of "workstation"/"desktop" form that
> any collector is likely to have still running, because they only had
> one CPU (unlike their Vogon-spaceship-sized siblings). As long as
> they had 64 bit load/store instructions, those couldn't be 'divided'
> by an interrupt, so scheduler switches shouldn't be able to tear them,
> AFAIK? }
PA-RISC can probably do tear-free 8-byte reads, but Andres also
wanted to raise the bar enough to include 32-bit atomic instructions,
which PA-RISC hasn't got; the one such instruction it has is
limited enough that you can't do much beyond building a spinlock.
Dunno about antique MIPS. I think there's still some interest in
not-antique 32-bit MIPS; I have some current-production routers
with such CPUs. (Sadly, they don't have enough storage to do
anything useful with, or I'd think about repurposing one for
buildfarm.)
regards, tom lane
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