| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Jan Wieck <JanWieck(at)Yahoo(dot)com> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Manfred Koizar <mkoi-pg(at)aon(dot)at>, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: Reduce heap tuple header size |
| Date: | 2002-06-25 20:20:36 |
| Message-ID: | 10502.1025036436@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches |
Jan Wieck <JanWieck(at)Yahoo(dot)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
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