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Ifpack2: Speedup additive schwarz, fix #9606 #10706
Ifpack2: Speedup additive schwarz, fix #9606 #10706
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@csiefer2 Like we talked about at today's Tpetra meeting, I just added a debug check in |
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@brian-kelley Thanks!
As you know, I would like Ifpack2 inner preconditioner to change to directly use Kokkos Crs matrices as opposed to Tpetra/Xpetra matrices. The use cases for distributed inner preconditioners are very theoretical and we might be able to extract more performance if we skip one more layer of abstraction. However, no need to worry about it in this PR yet as it is a big redesign.
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Is the PR testing always this flaky? |
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@vbrunini It's not posting to CDash so I don't know what's failing. I opened a helpdesk ticket about it. But I fixed the actual issues with my changes from the last time it posted, so it might just be random failures now. |
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I don't see failures in the cdash reports. Can someone post where we might find the results? |
@jhux2 The results aren't being posted to CDash correctly, so I opened a ticket about that. Framework gave me the Jenkins output directly. There was a real build error in my changes that didn't happen on my compiler, but I just pushed a fix. |
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@brian-kelley I'm looking at this now. |
//It does need to copy the whole local matrix to host when DualViews are constructed | ||
//(only an issue with non-UVM GPU backends) but this is just unavoidable when creating a Tpetra::CrsMatrix. | ||
//It also needs to compute local constants (maxNumRowEntries) but this should be a | ||
//cheap operation relative to what this constructor already did. |
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My understanding: This copy-to-host only happens once, at construction. The matrix graph is fixed, and if matrix values are later updated, no copy to host occurs.
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@jhux2 Unfortunately it also copies when I do setAllValues, since that re-constructs the WrappedDualViews in the matrix and graph. I don't think there's any other legal way to replace all the values without doing resumeFill/fillComplete, which I wanted to avoid.
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Oh, that's too bad. Perhaps fodder for discussion at a future Tpetra meeting.
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In future, if Karen's suggestion #9655 gets implemented, that would make this really easy because the WrappedDualView will handle it automatically. I already get a ReadWrite view of the matrix values, so I can just change them and then be done. No copying to host or fillComplete needed.
In practice, this may already work (without the setAllValues), but I'm kind of afraid it will subtly break things.
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lgtm -- have one question that I think I know the answer to
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@trilinos/ifpack2
Motivation
AdditiveSchwarz::compute()
re-import the overlapping part of the matrix (halo) so that the inner preconditioner can see the new values.Stakeholder Feedback
Required for Sierra milestone
Testing
OverlappingRowMatrix and AdditiveSchwarz are tested in Ifpack2.