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Re: [HACKERS] Sun Donated a Sun Fire T2000 to the PostgreSQL

From: David Roussel <pgsql-performance(at)diroussel(dot)xsmail(dot)com>
To:
Cc: pgsql-hackers(at)postgresql(dot)org, pgsql-performance(at)postgresql(dot)org
Subject: Re: [HACKERS] Sun Donated a Sun Fire T2000 to the PostgreSQL
Date: 2006-06-22 13:03:47
Message-ID: 449A9533.1030103@diroussel.xsmail.com (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-performance
  Arjen van der Meijden wrote:
>
> Here is a graph of our performance measured on PostgreSQL:
> http://achelois.tweakers.net/~acm/pgsql-t2000/T2000-schaling-postgresql.png 
>
>
...
>
> The "perfect" line is based on the "Max" value for 1 core and then 
> just multiplied by the amount of cores to have a linear reference. The 
> "Bij 50" and the "perfect" line don't differ too much in color, but 
> the top-one is the "perfect" line.

Sureky the 'perfect' line ought to be linear?  If the performance was 
perfectly linear, then the 'pages generated' ought to be G times the 
number (virtual) processors, where G is the gradient of the graph.  In 
such a case the graph will go through the origin (o,o), but you graph 
does not show this. 

I'm a bit confused, what is the 'perfect' supposed to be?

Thanks

David

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