Re: subtransaction performance

On Mon, Oct 10, 2022 at 08:34:33PM -0700, Nathan Bossart wrote:
> On Mon, Oct 10, 2022 at 02:20:37PM -0400, Bruce Momjian wrote:
> > On Fri, Oct 7, 2022 at 03:23:27PM -0700, Zhihong Yu wrote:
> >> I wonder if SAVEPOINT / subtransaction performance has been boosted since the
> >> blog was written.
> >
> > No, I have not seen any changes in this area since then. Seems there
> > are two problems --- the 64 cache per session and the 64k on the
> > replica. In both cases, it seems sizing is not optimal, but sizing is
> > never optimal. I guess we can look at allowing manual size adjustment,
> > automatic size adjustment, or a different approach that is more graceful
> > for larger savepoint workloads.
>
> I believe the following commitfest entries might be relevant to this
> discussion:
>
> https://commitfest.postgresql.org/39/2627/
> https://commitfest.postgresql.org/39/3514/
> https://commitfest.postgresql.org/39/3806/

Wow, odd that I missed those. Yes, they are very relevant. :-)
The only other idea I had was to report such overflows, but these are
better.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

Indecision is a decision. Inaction is an action. Mark Batterson