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RE: Updated: octave-2.1.71-2

From: Billings, Paul
Subject: RE: Updated: octave-2.1.71-2
Date: Mon, 15 Aug 2005 10:22:37 -1000


Good job on the FFTW packaging.  I can confirm identical FFT speeds with a
version that I had explicitly built to work with FFTW.

On the down side, however: matrix operations are slower.  Almost 70% slower
for the 256x256 matrix multiply I just tested.
octave_config_info('BLAS_LIBS') returns a blank string, whereas the previous
build had returned "-llapack -lblas".  I didn't build these libraries, so
they must be coming from Cygwin.  Perhaps they should be added to the
dependency tree for octave?

Incidentally, your long-term goal of getting ATLAS into the
build/installation procedure will be well worth it.  The matrix multiply
when using the above mentioned libblas is almost a factor of 10 slower than
when using ATLAS.


> -----Original Message-----
> From: James R. Phillips [mailto:address@hidden
> Sent: Monday, August 15, 2005 3:10 AM
> To: address@hidden
> Cc: address@hidden; address@hidden
> Subject: Updated: octave-2.1.71-2
> ====
> The cygwin octave package has been updated to release 2.1.71-2.
> Changes:
>  +Rebuilt to link against fftw3 libraries, for faster fft operations.
>  +Links with --enable-auto-image-base flag to reduce need for
> rebasing dlls.
>  +Fixed packaging error related to /usr/share/info/dir
> More information in the octave-2.1.71.README file.
> GNU Octave is a (mostly Matlab (R) compatible) high-level
> language, primarily
> intended for numerical computations.  It provides a convenient
> command-line
> interface for solving linear and nonlinear problems numerically.
> Octave Home Page: http://www.octave.org
> ======
> To update your installation, click on the "Install Cygwin now" link on the
> http://cygwin.com/ web page.  This downloads setup.exe to your
> system.  Save it
> and run setup, answer the questions and pick up 'octave' from the 'Math'
> category. Then click on the 'skip' field next to 'octave' until
> '2.1.71-2' is
> displayed.
> =========
> Note that downloads from sources.redhat.com (aka cygwin.com)
> aren't allowed due
> to bandwidth limitations.  This means that you will need to find
> a mirror which
> has this update, please choose the one nearest to you:
> http://cygwin.com/mirrors.html
> ==========
> If you want to make a point or ask a question the Cygwin mailing
> list is the
> appropriate place.
> =================================
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> ==========
> James R. Phillips

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