Dear Dao,

I am not sure I can confirm about the communication deadlock. Cwipi support was added by a collaborator and I am not sure it was ever tested with different versions of Cwipi.

I note from the CMake configuration that it searches for cwipi in paths given by the LD_LIBRARY_PATH and CWIPI_HOME/lib environmental variables. You could try setting one of those and seeing if that helps it detect 1.3.0. Make sure you try this on a clean configuration (i.e. an empty build directory).

Kind regards,
Chris

On 26/07/2025 21:18, dxz324@student.bham.ac.uk wrote:

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Dear Nektar++ Team,

I have two questions about using CWIPI coupling in Nektar++ 5.2.0 on ARCHER2:

Can a mismatch between the CWIPI library versions (the coupling application using CWIPI 1.3.0 vs. Nektar++ loading its bundled CWIPI 0.11.1) cause the MPI data exchange to deadlock at initialization?

If so, what’s the recommended way to override Nektar++’s default CWIPI 0.11.1 at build/install time so it links against an external CWIPI 1.3.0 (or later) instead?

For context, I’ve observed that on startup Nektar++ prints many:

cwipi 0.11.1 initializing

lines, while the external coupling application prints:

cwipi 1.3.0 initializing

and neither ever progresses to the “Coupling Config:” stage.

I tried pointing -DCMAKE_PREFIX_PATH at my CWIPI 1.3.0 install, but ldd AcousticSolver still shows libcwp.so.0.11.1. I also attempted manually replacing libcwp.so.0.11.1 with a symlink to libcwipi.so.1, without success.

Could you please confirm:

Whether version mismatch alone can block the CWIPI handshake?

The exact CMake or install steps needed to force Nektar++ to use an external CWIPI 1.3.0 instead of its internal copy?

Thank you for your guidance.

Best wishes,

Dao
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-- 
Chris Cantwell
Reader in Computational Engineering
Director of Postgraduate Studies (PhD)
Department of Aeronautics
Imperial College London
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London SW7 2AZ
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Email: c.cantwell@imperial.ac.uk
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