Re: PG 16 draft release notes ready

On Tue, May 23, 2023 at 11:26 AM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
>
> On Tue, May 23, 2023 at 09:58:30AM +0700, John Naylor wrote:
> > > Allow ASCII string detection to use vector operations on x86-64
architectures
> > (John Naylor)
> > > Allow JSON string processing to use vector operations on x86-64
architectures
> > (John Naylor)
> > >
> > > ARM?
> >
> > Arm as well. For anything using 16-byte vectors the two architectures
are
> > equivalently supported. For all the applications, I would just say
"vector" or
> > "SIMD".
>
> Okay, I kept "vector". I don't think moving them into performance makes
> sense because there I don't think this would impact user behavior or
> choice, and it can't be controlled.

Well, these two items were only committed because of measurable speed
increases, and have zero effect on how developers work with "source code",
so that's a category error.

Whether they rise to the significance of warranting inclusion in release
notes is debatable.

> > > Allow xid/subxid searches to use vector operations on x86-64
architectures
> > (Nathan Bossart)
> >
> > When moved to the performance section, it would be something like
"improve
> > scalability when a large number of write transactions are in progress".
>
> Uh, again, see above, this does not impact user behavior or choices.

So that turns a scalability improvement into "source code"?

> I assume this is x86-64-only.

Au contraire, I said "For anything using 16-byte vectors the two
architectures are equivalently supported". It's not clear from looking at
individual commit messages, that's why I piped in to help.

--
John Naylor
EDB: http://www.enterprisedb.com