From help-request at octave dot org Wed Jan 11 10:36:22 2006 Subject: Re: 2.9.4 speed From: David Bateman To: Shai Ayal Cc: help at octave dot org Date: Wed, 11 Jan 2006 17:31:48 +0100 Shai Ayal wrote: > Hi all, > > With all your help I was able to install 2.9.4, using Quentin's SRPMS for > ufsparse and glpk and applying a patch to the makefile as detailed in a > previous email to the list by Ismail. > > I am testing it against 2.1.72. both versions were configured with the > same > options and use the same blas/atlas/fftw and compilers. > > I have a some code which constructs a 201^2x201^2 sparse matrix and > inverts > it. While the inversion speed is comparable for both versions, The part > which constructs the I,J,S vectors which I later turn into the sparse > matrix by s=sparse(I,J,S) takes almost twice as much time in 2.9.4 (12 > seconds compared to 6 seconds). This part has a lot of loops, vector > concatenations etc... > > Does this sound familiar to anyone, or should I investigate further? > A little bit more break-down in where the slow-up is happening would help... D. > Shai > > > > ------------------------------------------------------------- > 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 > ------------------------------------------------------------- > -- David Bateman David dot Bateman at motorola dot com Motorola Labs - Paris +33 1 69 35 48 04 (Ph) Parc Les Algorithmes, Commune de St Aubin +33 1 69 35 77 01 (Fax) 91193 Gif-Sur-Yvette FRANCE The information contained in this communication has been classified as: [x] General Business Information [ ] Motorola Internal Use Only [ ] Motorola Confidential Proprietary ------------------------------------------------------------- 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 -------------------------------------------------------------