[Pw_forum] internal FFTW vs FFTW3

[Lorenzo Paulatto]

On Fri, Jun 29, 2012 at 5:46 AM, Roozbeh Sanaei <roozbehsanaei at yahoo.com>
 wrote:

> I Could Compile QE with Gfortran (Last version) but many examples were
> failing by Seg. Err.
>
> When I used internal FFTW instead of FFTW3 (justby replacing  _FFTW3 with
> _FFTW in make.sys) problem has now solved. It seems that there are kind of
> incompatablities between FFTW3 with QE or I dont know the exact reason.
>

If you were used system-wide FFTW3 (i.e. if you did apt-get install fftw3)
they were probably compiled with an incompatible compiler or compiler
options. This is true in general: performance libraries, like fftw, lapack,
atlas,... installed directly from online repositories are often crap (for
our purposes).

Regards,
> ROOZBEH SANAEI
>
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-- 
Lorenzo Paulatto IdR @ IMPMC/CNRS & Université Paris 6
phone: +33 (0)1 44275 084 / skype: paulatz
www:   http://www-int.impmc.upmc.fr/~paulatto/
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