[osdldbt-general] Re: [PERFORM] analyzing postgresql performance for dbt-2

[Mark W. <ma...@os...>]

On Tue, Oct 21, 2003 at 08:35:56PM -0400, Bruce Momjian wrote:
> ma...@os... wrote:
> > I'm running our DBT-2 workload against PostgreSQL 7.3.4 and I'm having
> > some trouble figuring out what I should be looking for when I'm trying
> > to tune the database.  I have results for a decent baseline, but when I
> > try to increase the load on the database, the performance drops.
> > Nothing in the graphs (in the links listed later) sticks out to me so
> > I'm wondering if there are other database statitics I should try to
> > collect. Any suggestions would be great and let me know if I can answer
> > any other questions.
> > 
> > Here are a pair of results where I just raise the load on the
> > database, where increasing the load increases the area of the database
> > touched in addition to increasing the transaction rate.  The overall
> > metric increases somewhat, but the response time for most of the
> > interactions also increases significantly:
> > 
> > http://developer.osdl.org/markw/dbt2-pgsql/158/ [baseline]
> > 	- load of 100 warehouses
> > 	- metric 1249.65
> > 	
> > http://developer.osdl.org/markw/dbt2-pgsql/149/
> > 	- load of 140 warehouses
> > 	- metric 1323.90
> 
> I looked at these charts and they looked normal to me.  It looked like
> your the load increased until your computer was saturated.  Is there
> something I am missing?

I've run some i/o tests so I'm pretty sure I haven't saturated that.  And it
looks like I have almost 10% more processor time left.  I do agree that it
appears something might be saturated, I just don't know where to look...

Thanks,
Mark