X-Original-To: pgsql-performance-postgresql.org@postgresql.org
Received: from localhost (mx1.hub.org [200.46.208.251])
	by postgresql.org (Postfix) with ESMTP id 3964C9F9ED6;
	Thu, 22 Jun 2006 10:22:58 -0300 (ADT)
Received: from postgresql.org ([200.46.204.71])
	by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024)
	with ESMTP id 75521-06; Thu, 22 Jun 2006 10:22:47 -0300 (ADT)
X-Greylist: delayed 00:18:51.797169 by SQLgrey-
X-Greylist: from auto-whitelisted by SQLgrey-
Received: from svr4.postgresql.org (svr4.postgresql.org [66.98.251.159])
	by postgresql.org (Postfix) with ESMTP id A21089FA621;
	Thu, 22 Jun 2006 10:22:44 -0300 (ADT)
X-Greylist: domain auto-whitelisted by SQLgrey-1.7.3
X-Greylist: domain auto-whitelisted by SQLgrey-1.7.3
Received: from out3.smtp.messagingengine.com (out3.smtp.messagingengine.com
	[66.111.4.27])
	by svr4.postgresql.org (Postfix) with ESMTP id D48F95AF04F;
	Thu, 22 Jun 2006 13:03:50 +0000 (GMT)
Received: from frontend3.internal (frontend3.internal [10.202.2.152])
	by frontend1.messagingengine.com (Postfix) with ESMTP id 8FCCBD85F49;
	Thu, 22 Jun 2006 09:03:48 -0400 (EDT)
Received: from heartbeat1.messagingengine.com ([10.202.2.160])
	by frontend3.internal (MEProxy); Thu, 22 Jun 2006 09:03:49 -0400
X-Sasl-enc: vS8IU6LgCSrQi69DZvJzV9+8ptwBt29BDLmRH+tcVoKL 1150981428
Received: from [149.191.9.25] (unknown [129.230.248.1])
	by mail.messagingengine.com (Postfix) with ESMTP id 7EAE15043;
	Thu, 22 Jun 2006 09:03:48 -0400 (EDT)
Message-ID: <449A9533.1030103@diroussel.xsmail.com>
Date: Thu, 22 Jun 2006 14:03:47 +0100
From: David Roussel <pgsql-performance@diroussel.xsmail.com>
User-Agent: Thunderbird 1.5.0.4 (Windows/20060516)
MIME-Version: 1.0
Cc: pgsql-hackers@postgresql.org, pgsql-performance@postgresql.org
Subject: Re: [HACKERS] Sun Donated a Sun Fire T2000 to the PostgreSQL
References: <4492CBE2.3090509@sun.com> <449331EC.10207@tweakers.net>
	<200606161624.17081.josh@agliodbs.com>
	<44951A42.6060007@tweakers.net>
In-Reply-To: <44951A42.6060007@tweakers.net>
Content-Type: multipart/alternative;
	boundary="------------090200070504010008060904"
X-Virus-Scanned: Maia Mailguard 1.0.1
X-Archive-Number: 200606/444
X-Sequence-Number: 19801

This is a multi-part message in MIME format.
--------------090200070504010008060904
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

  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

--------------090200070504010008060904
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#333333">
<div class="moz-text-html" lang="x-western"> Arjen van der Meijden
wrote:
<blockquote cite="mid44951A42.6060007@tweakers.net" type="cite"><br>
Here is a graph of our performance measured on PostgreSQL: <br>
  <a class="moz-txt-link-freetext"
 href="http://achelois.tweakers.net/%7Eacm/pgsql-t2000/T2000-schaling-postgresql.png">http://achelois.tweakers.net/~acm/pgsql-t2000/T2000-schaling-postgresql.png</a>
  <br>
  <br>
</blockquote>
...<br>
<blockquote cite="mid44951A42.6060007@tweakers.net" type="cite"><br>
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. <br>
</blockquote>
<br>
Sureky the 'perfect' line ought to be linear?&nbsp; 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.&nbsp; In
such a case the graph will go through the origin (o,o), but you graph
does not show this.&nbsp; <br>
<br>
I'm a bit confused, what is the 'perfect' supposed to be?<br>
<br>
Thanks<br>
<br>
David<br>
</div>
</body>
</html>

--------------090200070504010008060904--