RuntimeError: Failure creating FFTW plan

[applejwjcat]

Hi,
I have install mpi4py-fft from command conda install -c conda-forge mpi4py-fft, And it output no error when I import it.
However , when I run the test file, it output the errors like that:

Traceback (most recent call last):
  File "/home/tristan/learn_fft/mpi4py-fft/tests/test_fftw.py", line 162, in <module>
    test_fftw()
  File "/home/tristan/learn_fft/mpi4py-fft/tests/test_fftw.py", line 101, in test_fftw
    dct = fftw.dctn(input_array, None, axes, type, threads, fflags, output_array=oa)
  File "/home/tristan/.local/software/anaconda3/lib/python3.8/site-packages/mpi4py_fft/fftw/xfftn.py", line 397, in dctn
    return get_planned_FFT(input_array, output_array, axes, kind, threads,
  File "/home/tristan/.local/software/anaconda3/lib/python3.8/site-packages/mpi4py_fft/fftw/factory.py", line 106, in get_planned_FFT
    return _fft.FFT(input_array, output_array, axes, kind, threads, flags,
  File "mpi4py_fft/fftw/fftwf_xfftn.pyx", line 153, in mpi4py_fft.fftw.fftwf_xfftn.FFT.__cinit__
RuntimeError: Failure creating FFTW plan

I can't run the pfft_example.py with the same error, I think it is from the FFTW library.
I built my fftw library like this :

./configure --prefix=$HOME/.local/software/fftw-3.3.10 --enable-shared --enable-mpi --enable-float

and I have the bin file in my $PATH, also the lib file in my $LD_LIBRARY_PATH, is there something wrong I did?
Could you give me some advice, please?
Thanks

[applejwjcat]

I have also installed h5py and mpi4py modules.

[Kral-Chen]

I have the same problem

[mikaem]

Hi
Did you try to use the FFTW library that is installed automatically from conda-forge when you install mpi4py-fft? That version is configured appropriately and should work. You do not need FFTW built with MPI.

[Kral-Chen]

My anaconda python version was 3.8.8 before. Using conda update anaconda and conda update --all to upgrade anaconda python to version 3.8.13 and other packages. This problem is gone now. I'm not sure if it's caused by incompatible versions.

[applejwjcat]

Hi
Did you try to use the FFTW library that is installed automatically from conda-forge when you install mpi4py-fft? That version is configured appropriately and should work. You do not need FFTW built with MPI.

Thanks, actually, I installed the FFTW library manually and copied it to the conda library, it may incompatible with the mpi4py-fft, I used your method, and it works well

[pgrete]

Hi Did you try to use the FFTW library that is installed automatically from conda-forge when you install mpi4py-fft? That version is configured appropriately and should work. You do not need FFTW built with MPI.

I'm running into the same problem.

What is the appropriate configuration? @dalcinl
I'm asking as I'd prefer to use a virtualenv based on the python/mpi/mpi4py/fftw stack provided by the HPC facility rather than a custom conda version.

[dalcinl]

@pgrete Using python/mpi/mpi4py/fftw stack provided by the HPC facility should be totally fine. Just pip install mpi4py-fft in your virtualenv. Prior to pip install, you may need to set the environment variable FFTW_ROOT (or FFTW_DIR) pointing to the prefix directory of the FFTW installation, or FFTW_{INCLUDE|LIBRARY}_DIR if headers and libraries are installed separated (see the logics in mpi4py-fft's setup.py).