Re: Octave 2.1.57 vecLib Panther 10.3.4

[fl]

To clarify things a litte, first I compiled LAPACK (netlib.org) and linked 
with GOTO's blas lib. Then I copied  both the GOTO BLAS and LAPACK libs 
to the matlab/bin/glnx86 dir, renamed Matlab's original LAPACK and BLAS libs,
and made the following links:

lapack.so -> liblapack_LINUX_p4.so
libmwrefblas.so -> libgoto_p4_512-r0.9.so
libmwlapack.so -> liblapack_LINUX_p4.so

Below is a little comparison of the original Matlab
and the GOTO "enhanced" version on a dual P4 2GHz:

address@hidden:~> matlab -nojvm

             < M A T L A B >
     Copyright 1984-2002 The MathWorks, Inc.
       Version 6.5.0.180913a Release 13
               Jun 18 2002
 
>> A =randn(2000);
>> tic,B =A*A;toc

elapsed_time =

   11.0021

>> tic,B =A*A;toc

elapsed_time =

   11.0454

>> exit

address@hidden:>> goto_matlab -nojvm

             < M A T L A B >
     Copyright 1984-2002 The MathWorks, Inc.
       Version 6.5.0.180913a Release 13
               Jun 18 2002


> A =randn(2000);
>> tic,B =A*A;toc

elapsed_time =

    4.7745

>> tic,B =A*A;toc

elapsed_time =

    4.7858

>> exit


Fredrik



Quoting "Dmitri A. Sergatskov" <address@hidden>:

> Fredrik Lingvall wrote:
> > I recommend linking Octave with the GOTO BLAS libs instead of ATLAS.
> > GOTO BLAS can be found at:
> > 
> > http://www.cs.utexas.edu/users/flame/goto/
> > 
> > It got a speedup with about a factor of 2 on matrix multiplictions on a 
> > dual P4
> > using Matlab compared to the Matlab libs (which I think is ATLAS). There
> > is no G5 version available yet but I think it will be soon.
> > 
> 
> There is no Athlon library, nor a source code either.
> As for factor of 2, lets see here:
> 
> address@hidden dima]$ /import/opt/matlab6/bin/matlab -nojvm
> 
>                                < M A T L A B >
>                    Copyright 1984-2002 The MathWorks, Inc.
>                        Version 6.5.0.180913a Release 13
>                                  Jun 18 2002
> 
> ...
> 
>  >> a=rand(2000);
>  >> b=rand(2000);
>  >> tic; c=a*b; toc
> 
> elapsed_time =
> 
>      9.9345
> 
>  >> tic; c=a*b; toc
> 
> elapsed_time =
> 
>      9.9208
> 
>  >>
> 
> address@hidden octave]$ octave
> GNU Octave, version 2.1.57 (i686-pc-linux-gnu).
> Copyright (C) 2004 John W. Eaton.
> 
> ....
> 
> octave:1> a=rand(2000);
> octave:2> b=rand(2000);
> octave:3> tic; c=a*b; toc
> ans = 5.3369
> octave:4> tic; c=a*b; toc
> ans = 5.2770
> 
> (Using atlas 3.7.3 custom compiled for 2xAthlon 2000GHz).
> 
> 
> > Regards,
> > 
> > Fredrik
> 
> Regards,
> 
> Dmitri.
> 
> 
> 
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Octave is freely available under the terms of the GNU GPL.

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