Hi,
On Mon, Aug 17, 2026 at 03:36:03AM -0700, Zsolt Parragi wrote:
> > > but 010_backup_straddle.pl does not. Should 010_backup_straddle.pl also disable
> > > bgwriter to preserve dirty pages?
> >
> > I'm not sure, does it need to?
>
> I think the test should be safe as-is, since we have more than enough
> shared buffers. Even with 32mb shared buffers, the test reliably
> errors out without the fix.
Couldn't the bgwriter still flush those dirty pages, regardless of the shared
buffers size? On a slower BF animal, the launcher may remain paused long enough
for additional bgwriter cycles to flush the pages. I'd still set
bgwriter_lru_maxpages = 0 to make the test more deterministic.
Regards,
--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
