Running in parallel using MPI

[dokken]

As the message says, you should use the XDMF file format to read in the mesh, as described in for instance:

Gmsh import error

It seems like you have not read the post I linked you to. You cannot use the meshio-convert script out of the box for XDMF, and you have to use the meshio python interface. See the second section of: Mesh generation and conversion with GMSH and PYGMSH | Jørgen S. Dokken where I read in a mesh: import meshio mesh_from_file = meshio.read("mesh.msh") extract data for a given cell type def create_mesh(mesh, cell_type, prune_z=False): cells = numpy.vstack([cell.data for cell in mesh.cells if …

or

Mesh generation and conversion with GMSH and PYGMSH