[petsc-dev] MatMPIAIJGetLocalMat problem with GPUs

[Mark Adams]

On Mon, Jun 27, 2022 at 2:16 PM Matthew Martineau <mmartineau at nvidia.com>
wrote:

> Theoretically the access patterns can be worse, but our sparse operations
> output matrices with unordered columns, so the fine matrix being sorted
> shouldn’t impact the overall performance.
>

And this "unsorted" is really two _sorted_ blocks and the 2nd block is for
off-processor "halo" neighbors, which is a lower order thing.
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