Nodal Solver: Use multi-color Gauss-Seidel on GPU #4043
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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.