Add multi-GPU support for the Poisson solver in CUDA backend

xcompact3d / x3d2

https://xcompact3d.github.io/x3d2

BSD 3-Clause "New" or "Revised" License

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Closed semi-h closed 2 months ago

semi-h commented 3 months ago

Adds slab decomposition support via cuFFTMp library.

The slab decomposition is in PHYSICAL_IN_X setup in 2DECOMP&FFT terminology.