From help-request at octave dot org Mon Jan 24 03:34:06 2005
Subject: Re: Very slow filter.cc
From: Michael Creel <michael dot creel at uab dot es>
To: help at octave dot org
Date: Mon, 24 Jan 2005 10:34:12 +0100

On Saturday 22 January 2005 15:50, Miroslaw Kwasniak wrote:
> On Fri, Jan 21, 2005 at 03:20:52PM +0100, Miroslaw Kwasniak wrote:
> > On Wed, Jan 19, 2005 at 09:45:37AM +0100, David Bateman wrote:
> > > t = cputime; y = filter(b,1,x); cputime - t
> > >
> > > rather than using tic/toc and see if there is better consistency
> > > between 2.0.17 and the 2.1.x versions...
>
> Test code:
>
>  OCTAVE_VERSION
>  x = randn(1e6,1);
>  b = randn(500,1);
>  t = cputime;
>  y = filter(b,1,x);
>  cputime - t
>
> > $ sh run.sh
> > OCTAVE_VERSION = 2.0.17
> > ans = 2.0600
> > OCTAVE_VERSION = 2.1.50
> > ans = 15.380
> > OCTAVE_VERSION = 2.1.57
> > ans = 15.690
> > OCTAVE_VERSION = 2.1.63
> > ans = 14.060
> >
> > 2.1.63 is a little better because it's compiled for 686 - rest are debian
> > 386 packages.
>
> The same machine as above (Athlon 1600XP), fresh cvs source
>
> OCTAVE_VERSION = 2.1.64
> ans = 4.1000
>
> Hmmm, ...
>
> Only important diff between 2.1.63/2.1.64 octave_config_info output:
>
> -  CC_VERSION = 3.3.4 (Debian 1:3.3.4-13)
> +  CC_VERSION = 3.3.5 (Debian 1:3.3.5-5)
> -  CXX_VERSION = 3.3.4
> +  CXX_VERSION = 3.3.5
>
By any chances, can the differences be due to changes in random number 
generators? Can you repeat this loading given data from a file?
Michael.



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