[Wien] FFTW compiling

[Riyajul Islam]

I am using Ubuntu 16.04 with intel mpi and there was no error warning
during FFTW installation.

On Wed, 3 Jul 2019 at 15:33, Pavel Ondračka <pavel.ondracka at email.cz> wrote:

> Maybe Gavin can clarify but I'm not actually sure if the instructions
> in the mentioned email are 100% correct. FFTW there is compiled with
> the default static libs (libfftw3.a and libfftw3_mpi.a), but the actual
> -lfftw3 -lfftw3_mpi flags used for linking are for the dynamic library
> (libfftw3.so and libfftw3_mpi.so). My guess is that it worked for Gavin
> due to having another dynamic fftw somewhere in the path (e.g., the
> system fftw libraries)?
>
> Anyway, if you can get libfftw3.a but not libfftw3_mpi.a even when you
> pass --enable-mpi to fftw configure, there is likely some problem with
> your MPI installation. Were there any warnings during fftw configure?
> BTW on some distributions like Fedora, only installing openmpi or mpich
> is not enough you must also load it to set all the paths properly (for
> example on Fedora with "module load openmpi"). This is distribution
> specific though.
>
> To get the dynamic library, just pass --enable-shared to fftw
> configure, the Wien2k flags should work than (provided you can figure
> out the missing mpi fftw lib). However I would highly recommend to get
> the fftw from distribution repositories (something like libfftw3-mpi-
> dev and libfftw3-dev package is needed, but specific package names vary
> with distribution as well), unless you are on some enterprise systemwith
> legacy fftw version.
>
> Best regards
> Pavel
>
> On Wed, 2019-07-03 at 14:57 +0530, Riyajul Islam wrote:
> > Hellow wien2k users,
> > I am facing a problem in compiling FFTW in sitecofiguration. I have
> > followed all the steps as in "
> >
> https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg18664.html
> > ". But could nopt acces the
> > "/home/username/fftw3/mpi/.libs/libfftw3_mpi.a" as in in mailing
> > list.
> > the current settings for FFTW is
> > F   FFTW options:            -DFFTW3 -I/home/edison1/fftw3/include
> >       FFTW-LIBS:               -L/home/edison1/fftw3/lib64 -lfftw3
> >       FFTW-PLIBS:              NOT FOUND!
> >
> > How can I solve this issue?
> >
> > Regards,
> > Riyajul Islam
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-- 
Riyajul Islam
Research Scholar
National Institute of Technology Nagaland
Chumukedima, Dimapur
Nagaland 797103, India
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