From help-request at octave dot org Wed Jan 11 12:38:31 2006 Subject: Re: 2.9.4 speed From: Shai Ayal To: David dot Bateman at motorola dot com Cc: help at octave dot org Date: Wed, 11 Jan 2006 20:27:45 +0200 David Bateman wrote: > 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... > I take that to mean that I should investigate further :) tomorrow than... 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 -------------------------------------------------------------