Re: Huge performance problem between 7.4.1 and 8.0.3 - CS

When grilled further on (Tue, 19 Jul 2005 12:09:51 -0600),
Robert Creager <Robert_Creager@StorageTek.com> confessed:

> On Tue, 19 Jul 2005 12:54:22 -0400
> Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> > Hmm, I hadn't thought about the possible impact of multiple concurrent
> > vacuums.  Is the problem caused by that, or has performance already gone
> > into the tank by the time the cron-driven vacuums are taking long enough
> > to overlap?
>
>
> I'll re-start the database, vacuum full analyze and restart the runs without
the
> cron vacuum running.
>

It took a few hours, but the problem did finally occur with no vacuum running on
803.  CS is averaging 72k.  I cannot quantitatively say it took longer to
reproduce than with the vacuums running, but it seemed like it did.

Can any information be gotten out of this?  Should I try CVS HEAD?

Thoughts?

Thanks,
Rob

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