Re: OSDL Database Test Suite 3 is available on PostgreSQL - Mailing list pgsql-performance

On Mon, 4 Aug 2003, Manfred Koizar wrote:

> On 01 Aug 2003 11:04:10 -0700, Jenny Zhang <jenny@osdl.org> wrote:
> >A sample OSDL-DBT3 test result report can be found at:
> >http://khack.osdl.org/stp/276912/
> >
> >Your comments are welcome,
>
> | effective_cache_size           | 1000
>
> With 4GB of memory this is definitely too low and *can* (note that I
> don't say *must*) lead the planner to wrong decisions.
>
> | shared_buffers                 | 15200
>
> ... looks reasonable.  Did you test with other values?
>
> | sort_mem                       | 524288
>
> This is a bit high, IMHO, but might be ok given that DBT3 is not run
> with many concurrent sessions (right?).
> http://khack.osdl.org/stp/276912/results/plot/vmstat_swap.png shows
> some swapping activity towards the end of the run which could be
> caused by a too high sort_mem setting.

And, as always, don't forget to set effect_cache_size.