Trilinoscouplings: Implementing the Rebalance_LinearProblem transform using Tpetra and Zoltan2. Update test as well. #14580

eeprude · 2025-10-18T08:12:30Z

@trilinos/

Motivation

The RebalanceTransform is usually used as part of the sequence of 4 transforms, in the following order:
1- SingletonTransform (which will be available in Tpetra soon)
2- SolverMapTransform (already available in Tpetra, per merge request #14279)
3- ReindexTransform (which will be avaiable in Tpetra soon as well, per merge request #14424)
4- RebalanceTransfrom (this merge request).

This new rebalance transform:

aims to rebalance the distribution of linear problem contents (matrix, lhs, and rhs) among MPI nodes,
needs to be in trilinoscouplings/src/tpetra because it needs to access classes from both Tpetra and Zoltan2,
replaces the combination of two transforms using classes from Epetra and Isorropia: trilinoscouplings/src/epetraext/EpetraExt_Isorropia_CrsGraph, and epetraext/src/transform/EpetraExt_LPTrans_From_GraphTrans.h. Such combination is exemplified in trilinoscouplings/examples/epetraext/EpetraExt_Isorropia_LPTrans_Ex.cpp.

Related Issues

Closes 14439

Stakeholder Feedback

Testing

There is already an example in trilinoscouplings/examples/tpetra/Tpetra_Zoltan2_LPTrans_Ex.cpp that shows how to combine Tpetra and Zoltan2. This pull request implements the new Tpetra transform and uses it in the example.

This pull request replaces the old PR #14440

…0. These changes now also include all the ETI changes by Christian Glusa, plus his latest small correction on ifpack2/src/CMakeLists.txt Signed-off-by: Ernesto Prudencio <[email protected]>

github-actions · 2025-10-18T08:12:40Z

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Test Name: PR_gcc-openmpi-openmp

Build Num: 2483
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Repo: TRILINOS (eeprude/Trilinos)

Pull Request Author: eeprude

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Build Information

Test Name: PR_gcc-openmpi-openmp

Build Num: 2483
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Pull Request Author: eeprude

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