David Cournapeau wrote:

Nils Wagner wrote:

...

Hi all,

I am going to install numpy/scipy (svn version) on an Intel(R) Core(TM)2 CPU. And I would like to build everything from scratch (including BLAS/LAPACK/ATLAS).

Which compiler options/flags should I use for BLAS/LAPACK in that case ?

Which fortran compiler g77/gfortran is currently recommended to build numpy/scipy ?

BTW, I am using openSUSE 10.2.

Nils

For Atlas, you should use the flags set by the ATLAS build system. If you use recent ATLAS sources (3.7.* serie), there are some arch default for your CPU, I think.

cheers,

David _______________________________________________ SciPy-user mailing list SciPy-user@scipy.org http://projects.scipy.org/mailman/listinfo/scipy-user

Hi again, I am confused about CPU THROTTLING. How can I switch off CPU throttling on SuSE Linux 10.2 ? I found a command "cpufreq-set" but I don't know how to proceed. ATLAS uses gfortran by default but I have used g77 to build BLAS/LAPACK. Can I replace gfortran in Make.inc by g77 ? I have used /usr/local/src/ATLAS/configure -Fa alg -fPIC -Si cputhrchk 0 to configure ATLAS (3.7.28) Nils http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufreq-set.html

David Cournapeau wrote:

Nils Wagner wrote:

...

David Cournapeau wrote:

...

Nils Wagner wrote:

...

Hi all,

I am going to install numpy/scipy (svn version) on an Intel(R) Core(TM)2 CPU. And I would like to build everything from scratch (including BLAS/LAPACK/ATLAS).

Which compiler options/flags should I use for BLAS/LAPACK in that case ?

Which fortran compiler g77/gfortran is currently recommended to build numpy/scipy ?

BTW, I am using openSUSE 10.2.

Nils

For Atlas, you should use the flags set by the ATLAS build system. If you use recent ATLAS sources (3.7.* serie), there are some arch default for your CPU, I think.

cheers,

David _______________________________________________ SciPy-user mailing list SciPy-user@scipy.org http://projects.scipy.org/mailman/listinfo/scipy-user

Hi again,

I am confused about CPU THROTTLING.

How can I switch off CPU throttling on SuSE Linux 10.2 ?

I don't know anything about Suse, but if the command line cupfreq-set works, you should try (as root generally) as written in the docs:

cpufreq-selector -g performance

On SuSE Linux you have cpufreq-set -g performance

cpufreq works by using so called governor (hence the -g), and the performance one is more or less equivalent to disabling cpu throttling, as I understand it (note that I don't know much about those things; but if I do that on my laptop, it is working as expected).

...

I found a command "cpufreq-set" but I don't know how to proceed.

ATLAS uses gfortran by default but I have used g77 to build BLAS/LAPACK.

ATLAS is written in C, so in my understanding is that the fortran compiler is just used to build the Fortran interface to the C blas/lapack built by ATLAS. I think the key point is to always keep the same compiler (eg if you use gfortran, make sure you always use it for all the libraries used by numpy/scipy like umfpack, etc...).

One way to check which one is "better", would be to check other fortran libraries you are using, I guess (eg, what is the Suse default: g77 or gfortran ?).

In the end I have used g77. How do I build/install numpy/scipy with gfortran ? If I just use python setup.py build python setup.py install to build numpy/scipy g77 is called. Cheers, Nils

cheers

David

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