Re: Reduce heap tuple header size

Tom Lane wrote:
>
> Jan Wieck <JanWieck@Yahoo.com> writes:
> > Do we have any hard numbers on that? Is it just access to the header
> > fields, or do we loose the offset cacheability of all fixed size fields
> > at the beginning of a row? In the latter case count me into the
> > slowness-believer camp.
>
> I don't believe the patch would have made the header variable size,
> only changed what the fixed size is.  The slowdown I was worried about
> was just a matter of a couple extra tests and branches in the tqual.c
> routines; which would be negligible if they weren't such hotspots.

Did someone run at least pgbench with/without that patch applied?


Jan

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