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Re: Problems switching BLAS and LAPACK versions

From: Mike Miller
Subject: Re: Problems switching BLAS and LAPACK versions
Date: Mon, 26 Dec 2016 09:59:41 -0800
User-agent: NeoMutt/20161126 (1.7.1)

On Mon, Dec 26, 2016 at 13:57:34 +0200, Tommi Höynälänmaa wrote:
> I have problems with switching BLAS libraries with
> update-alternatives. I have built my own Debian packages of BLAS where
> I added some debug write commands to dnrm2.f. Then I switched the
> system to use my own version of BLAS with command "update-alternatives
> --config". When I use liboctave Matrix::lssolve and link
> my program to BLAS I see no debug outputs and apparently my own
> version of dnrm2 is not called.
> What is wrong here?

That may depend on how you installed Octave. Is Octave installed from
Debian archive packages or did you build it from source yourself? Is
liboctave linked against libblas or libopenblas? If you set a breakpoint
on dnrm2_ in gdb, does it reveal more about which library is being


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