Re: index prefetching

On Thu, Aug 28, 2025 at 7:52 PM Tomas Vondra <tomas@vondra.me> wrote:
> Use this branch:
>
>   https://github.com/tvondra/postgres/commits/index-prefetch-master/
>
> and then Thomas' patch that increases the prefetch distance:
>
>
> https://www.postgresql.org/message-id/CA%2BhUKGL2PhFyDoqrHefqasOnaXhSg48t1phs3VM8BAdrZqKZkw%40mail.gmail.com
>
> (IIRC there's a trivial conflict in read_stream_reset.).

I found it quite hard to apply Thomas' patch. There's actually 3
patches, with 2 earlier patches needed for earlier in the thread. And,
there were significant merge conflicts to work around.

I'm not sure that Thomas'/your patch to ameliorate the problem on the
read stream side is essential here. Perhaps Andres can just take a
look at the test case + feature branch, without the extra patches.
That way he'll be able to see whatever the immediate problem is, which
might be all we need.

--
Peter Geoghegan