On Fri, 22 Oct 2021 at 19:27, Robert Haas <robertmhaas@gmail.com> wrote:
>
> Another thing to think about in that regard: how likely is that
> PostgreSQL 7.4 and PostgreSQL 15 both compile and run on the same
> operating system? I suspect the answer is "not very." I seem to recall
> Greg Stark trying to compile really old versions of PostgreSQL for a
> conference talk some years ago, and he got back to a point where it
> just became impossible to make work on modern toolchains even with a
> decent amount of hackery.
That was when I compared sorting performance over time. I was able to
get Postgres to build back to the point where 64-bit architecture
support was added. From Andrew Dunstans comment later in this thread
I'm guessing that was 7.2
That was basically at the point where 64-bit architecture support was
added. It looks like the earliest date on the graphs in the talk are
2002-11-27 which matches the 7.3 release date. I think building
earlier versions would have been doable if I had built them in 32-bit
mode.
--
greg