Andres Freund <andres@2ndquadrant.com> writes:
> I don't like going in this direction at all:
> 1) it breaks pg_upgrade. Which means many of the bigger users won't be
> able to migrate to this and most packagers would carry the old
> segsize around forever.
> Even if we could get pg_upgrade to split files accordingly link mode
> would still be broken.
TBH, I think *any* rearrangement of the on-disk storage files is going
to be rejected. It seems very unlikely to me that you could demonstrate
a checkpoint performance improvement from that that occurs consistently
across different platforms and filesystems. And as Andres points out,
the pain associated with it is going to be bad enough that a very high
bar will be set on whether you've proven the change is worthwhile.
regards, tom lane
