Hi, I have a question regarding dolfinx and the parallel usage of the dofmap. In legacy fenics, there was the option to use V.sub(i).dofmap().dofs() which gave the global DoF indices that are owned by the current process for the i-th subsapce of some function space V. How can I get this informa…

Parallelization in dolfinx heavily relies on the index_map. You’ll find that construct whenever arrays of data need to be distributed. Are you looking for something like this? V0, V0_localdofs = V.sub(0).collapse() # V0 dofs in V local on this core V_indexmap = V.dofmap.index_map V0_globaldofs = np…

DoF's of subspace in parallel

dolfinx

Stein February 11, 2025, 10:40am 4

Ah, right. I took that code snippet from an earlier post of mine that eventually was about PETSc.IS. For reference:

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DoF's of subspace in parallel

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