Re: Reduce heap tuple header size

Jan Wieck <JanWieck@Yahoo.com> writes:
> Well, it turned out that pgbench does a terrible job with runtimes below
> 30 minutes. Seems that one checkpoint more or less can have a
> significant impact on the numbers reported by such run.

Yeah, it is *very* painful to get reproducible numbers out of pgbench.

> Using the above, the discussed change to the tuple header shows less
> than 1% difference.

So the bottom line is that there is probably no measurable performance
difference, but a 3% space savings, at least for average row lengths
comparable to those used in pgbench.  (Obviously the space savings is
going to depend on average row length...)

            regards, tom lane