Merging a partitioned ascent blueprint extract to single partition about conduit HOT 4 CLOSED

Hi @mlohry here is what you need:

You can load a mesh using the info from the root file and all other needed data files using the method:

conduit::relay::io::blueprint::read_mesh

https://llnl-conduit.readthedocs.io/en/latest/blueprint_mesh.html#loading-meshes-from-files

conduit::relay::io::blueprint::read_mesh(const std::string &root_file_path,
                                         conduit::Node &mesh);

After this, the node passed as mesh will contain a verified blueprint mesh that you can feed to re-partition.

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For more context, the root file has metadata the reflects the larger structure of the domain-decomposed mesh and that info points to locations in other hdf5 files. The read_mesh method handles all of the bookkeeping to read things back in.

There is also a mpi version that allows you to read the mesh, but have the domains distributed across MPI tasks.

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Thank you @cyrush , got it.

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@cyrush , got that aspect working, but does this partition merging know about ascent_ghosts? I'm getting holes in the mesh along partition lines when merging to one partition. The partitioned extract is the result of giving blueprint+ascent each partition in 0-based local ordering.

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