From help-request at octave dot org Thu Jun 24 09:35:14 2004
Subject: Re: Octave 2.1.57 vecLib Panther 10.3.4
From: Paul Kienzle <pkienzle at users dot sourceforge dot net>
To: Samir Sharshar <samir dot sharshar at mac dot com>
Cc: help at octave dot org
Date: Thu, 24 Jun 2004 10:34:54 -0400

The princomp routine on octave forge uses
	C = cov(X)
	[U,D,pc] = svd(C,1)
Can you tell us which of these is running slower on large arrays?

How does the performance of other routines such as
lu, A*B and qr compare?

Does biG5 mean dual processor?  Does veclib automatically
parallelize blas?  Are both processors active?

Paul Kienzle
pkienzle at users dot sf dot net

On Jun 21, 2004, at 10:22 AM, Samir Sharshar wrote:

> Hi,
>
> Please let me report my experience about Octave-2.1.57 compiling and 
> installing on a Mac OS 10.3.4 (Panther) with the last development 
> tools from Apple that provides the vecLib libraries and headers (a 
> BLAS, LAPACK like, as I mean).
>
> I've compiling and installing Octave-2.1.57 from sources with prior 
> installation of g77-3.5 and fftw3.0.1-fma.
>
> Octave runs perfectly on my machine; a biG5 at 2 gHz with 4 Go RAM.
>
> However, there is a problem that I can't resolve by myself. Principal 
> component analysis runs really slowly (three times less than on a 
> equivalent octave installation on a Debian runnng on a PIV 3.2 GHz). 
> Things are worst when octave was compiling linking ATLAS libraries 
> instead of vecLib ones.
>
> Have you any idea ?
>
> Thanks in advance,
>
> Best wishes,
>
> Samir Sharshar MD
> Inserm, Lille, France
>
>
>
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
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