Re: Initial prefetch performance testing

On Mon, 2008-09-22 at 16:46 +0100, Gregory Stark wrote:
> Simon Riggs <simon@2ndQuadrant.com> writes:
> 
> > On Mon, 2008-09-22 at 04:57 -0400, Greg Smith wrote:
> >
> >> -As Greg Stark suggested, the larger the spindle count the larger the 
> >> speedup, and the larger the prefetch size that might make sense.  His 
> >> suggestion to model the user GUC as "effective_spindle_count" looks like a 
> >> good one.  The sequential scan fadvise implementation patch submitted uses 
> >> the earlier preread_pages name for that parameter, which I agree seems 
> >> less friendly.
> >
> > Good news about the testing.
> >
> > I'd prefer to set this as a tablespace level storage parameter. 
> 
> Sounds, like a good idea, except... what's a tablespace level storage parameter?

A storage parameter, just at tablespace level.

WITH (storage_parameter = value)

-- Simon Riggs           www.2ndQuadrant.comPostgreSQL Training, Services and Support