[petsc-users] Parallel 3d decomposed FFT

[Hong]

frank:

>
> I am trying to use petsc's Interface to do a 3d FFT.
> I created a 3d DMDA.  When I tried to call VecScatterPetsctoFFTW, I got
> error message saying "FFTW does not support parallel 3d FFT."

I understand that FFTW only supports 2d decomposition, like a 2d pencil.
> But is there any way I can use petsc to implement a 3d decomposed FFT?
>

I guess you do parallel 3D real transform, which is not supported by FFTW.
We are not experts on FFT. You have to search external packages that
implement it.

Hong
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