[SciPy-user] fftw, scipy ("old") install
pearu at scipy.org
Mon Oct 17 04:41:09 CDT 2005
On Mon, 17 Oct 2005, Arnd Baecker wrote:
> it seems that I failed with fftw on the opteron ;-) -
> scipy fft is (much) slower than the Numeric one
> (see output below).
> I installed fftw via::
> tar xzf ../Sources/fftw-3.0.1.tar.gz
> cd fftw-3.0.1/
> ./configure CFLAGS=-fPIC --prefix=$PHOME
> make install
The old scipy.fftpack supports only fftw2. I have a patch for fftw3
somewhere. I'll apply it as soon as I'll get a chance to work on fftpack.
> Reconsidering this after seeing the poor performance
> shows that, `nm _fftpack.so` gives me no symbols related to fftw.
Yes, _fftpack.so should contain Fortran fftpack when fftw (v2) library is
> And for future builds:
> Is there a way to check (on the python level) which fft is used
> *after* the installation?
Normally it should be unnecessary. However, scipy building scripts install
config.py (old scipy) or __config__.py (newscipy) files containing the
system information used in building scipy.
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