Make MUMPS and others solvers available on NGSolve install with PIP

Installation & Troubleshooting
1

Dear community.

It seems that the only solver with the default instalation of NGSolve with PIP and linux installers is UMFPACK.
For instance, on one side I have installed NGSolve using the pip install and Pypi. When trying to run the typical

inv = K.mat.Inverse(fes.FreeDofs(), inverse="mumps")

Then the following error comes:

netgen.libngpy._meshing.NgException: SparseMatrix::InverseMatrix: MumpsInverse not available

Similar error happen with the rest of the solvers like pardiso, superlu, sparsecholesky, etc.

When trying to run the same approach, but now on a Ubuntu 22.04 system and the NGSolve PPA repo, I got the same errors.

What is the proper way of making the solvers available?. Can this be done in an Anaconda environment + pip install?.

Thanks in advance.

2

You can install now PETSc via pip and add configuration flag that makes it download also MUMPS. See NGSolve 24 — NGSolve 24
.
In particular, you want:

export PETSC_CONFIGURE_OPTIONS="--with-fc=0 --with-debugging=0 --download-hypre --download-mumps \
         COPTFLAGS=\"-O2\" CXXOPTFLAGS=\"-O2\" "

After you have PETSc with mumps you can use ngsPETSc with MUMPS in a very easy manner, see: Solving the Poisson problem with different preconditioning strategies — ngsPETSc 0.0.5 documentation
In particular, it is sufficient to set the "pc_factor_mat_solver_type": "mumps"} in the solver parameters dictionary.

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