Hi Dolfinx community! I am working on migrating a solver module for generalized field-splitting and preconditioning from FEniCS 2019 to DOLFINx (0.9.0). My workflow works well in serial, but has been giving me trouble in parallel when I set up a PCFIELDSPLIT. I think I have narrowed it to the DOF i…

If you just want the global indices of all (including ghost dofs) in the sub-space, the easiest is to do the following: from mpi4py import MPI import numpy as np import dolfinx import basix comm = MPI.COMM_WORLD rank = comm.rank line_mesh = dolfinx.mesh.create_interval(MPI.COMM_WORLD, 5, [0.0, 1.0…

Is this what you’re looking for? [image] Precondition appears not to happen dolfinx Hi all, For a Navier-Stokes problem, I want to separately precondition the u block (Jacobi) and the p block (algebraic multigrid on the Schur complement), while using mixed sp…

This is it! For those looking, the solution is in post 4 of Stein’s thread . Dokken’s solution additionally works. Thanks all!

Global DOFs map from index_map.local_range in MPI

dolfinx

Stein August 15, 2025, 6:05am 2

Is this what you’re looking for?

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Global DOFs map from index_map.local_range in MPI

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