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Fix MPI communicator for parallel-in-time

Jacques Xing requested to merge CFD-Xing/nektar:fix/comm-parareal into master

Issue/feature addressed

Update some MPI communicator calls with GetSpaceComm() to avoid deadlock when using Parareal.

Proposed solution

Implementation

Tests

Suggested reviewers

Please suggest any people who would be appropriate to review your code.

Notes

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Checklist

  • [ ] Functions and classes, or changes to them, are documented.
  • [ ] User guide/documentation is updated.
  • Changelog is updated.
  • [ ] Suitable tests added for new functionality.
  • Contributed code is correctly formatted. (See the contributing guidelines).
  • [ ] License added to any new files.
  • No extraneous files have been added (e.g. compiler output or test data files).
Edited by Jacques Xing

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