Add a sorting check to the CUDA/HIP spgeam kernel and sort the diagonal in Schwarz precond#1932
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Add a sorting check to the CUDA/HIP spgeam kernel and sort the diagonal in Schwarz precond#1932
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…al in Schwarz precond
gojakuch
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1:ST:WIP
ginkgo-bot
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mod:core
yhmtsai
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Sep 26, 2025
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| // check the sorting | ||
| bool sorted; | ||
| is_sorted_by_column_index(exec, a, &sorted); | ||
| if (!sorted) | ||
| throw std::invalid_argument("spgeam: a is not sorted by column index"); | ||
| is_sorted_by_column_index(exec, b, &sorted); | ||
| if (!sorted) | ||
| throw std::invalid_argument("spgeam: b is not sorted by column index"); |
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should it be in the data validation?
Member
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I am working on a PR that introduces a better interface for SpGEMM/SpGEAM, and would make this change obsolete, I would suggest holding off on it until that PR is ready. |
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@upsj so did your PR make these changes unneeded effectively solving the issue? |
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@gojakuch It added a new interface with clear documentation, which is at least an improvement - I think adding a check here could be detrimental, since the cost of an SpGEAM is in the same order of magnitude as the cost of the sortedness check in the success case. |
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I'll open another PR that just adds the sorting of the matrix in the preconditioner to fix the issue using the new interface without adding the sorting check |
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Fixes: #1920