Nodal Solver: Use multi-color Gauss-Seidel on GPU #4043
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Because the nodal solver's Gauss-Seidel smoother is not thread safe on GPU, we have been using Jacobi. But recently an amr-wind test shows that the Jacobi smoother is not stable for some hard problems. Using a multi-color (4 in 2d and 8 in 3d) Gauss-Seidel smoother appears to work well.
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This has passed our regression tests on CPU and GPU. The amr-wind test with anisotropic resolution works. |
asalmgren
approved these changes
Jul 23, 2024
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Because the nodal solver's Gauss-Seidel smoother is not thread safe on GPU, we have been using Jacobi. But recently an amr-wind test shows that the Jacobi smoother is not stable for some hard problems. Using a multi-color (4 in 2d and 8 in 3d) Gauss-Seidel smoother appears to work well.