On Wed, 1 Dec 2021 at 06:41, Andrey Borodin <x4...@yandex-team.ru> wrote:
> > On review, I think it is also possible that we update subtrans ONLY if > > someone uses >PGPROC_MAX_CACHED_SUBXIDS. > > This would make subtrans much smaller and avoid one-entry-per-page > > which is a major source of cacheing. > > This would means some light changes in GetSnapshotData(). > > Let me know if that seems interesting also? > > I'm afraid of unexpected performance degradation. When the system runs fine, > you provision a VM of some vCPU\RAM, and then some backend uses a little more > than 64 subtransactions and all the system is stuck. Or will it affect only > backend using more than 64 subtransactions? That is the objective: to isolate the effect to only those that overflow. It seems possible. -- Simon Riggs http://www.EnterpriseDB.com/
