Re: How to speed up Octave

[Dmitri A Sergatskov]

On 20 Jun 2001, Trond Eivind Glomsrod wrote:

> > | tic;A=rand(20,20000);B=svd(A);toc
> > | tic;A=rand(2000,2000);B=prod(A);toc
> > | tic;A=rand(1000,1000);B=inv(A)*A;toc
> >
> > I believe all of these operations involve calls to lapack and/or blas
> > libraries.  If you use a recent development version of Octave linked
> > with the atlas libraries, then you will probably see some improvement.
>
> I just tried this on a Dual PIII 733 system, 256 MB RDRAM with Red Hat Linux 
> 7.1 and atlas
> configured for this machine ("make config" run locally, standard options 
> except don't use
> -omit-frame-pointer and  add "-march=i386 -mcpu=i686"), gcc 2.96RH.
>
> - the first test was on average 14% faster with Atlas. In the second test, 
> atlas didn't matter.
> The third test was the only one showing a real gain: Just above 40% faster 
> with Atlas.
>
>

Did you do timing together with 'rand'? It may give a significant offset.
What about pure 'svd', 'prod' and 'inv'.

Dmitri.



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