Implement Thomas algorithm on CUDA backend

xcompact3d / x3d2

https://xcompact3d.github.io/x3d2

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

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Implement Thomas algorithm on CUDA backend #111

Closed semi-h closed 4 months ago

semi-h commented 4 months ago

The PR implements Thomas algorithm based on our specialist data structure and adds a unit test as well. The idea is that we can call the Thomas algorithm implementation instead of the distributed algorithm in case we have a single rank along a direction.