Re: [Libmesh-users] make check reduced_basis_ex7 flags

[<ed...@op...>]

On 2020-05-11 11:06, David Knezevic wrote:
> I think PETSc changed the option name from 
> "-pc_factor_mat_solver_package"
> to "-pc_factor_mat_solver_type", which I guess is the issue here.

Yes, thank you.

> 
> Also, you can use "-ksp_view" on the command line to get a printout of 
> the
> solver options that were used by PETSc, so you can see if it actually 
> used
> MUMPS or superlu.

Yes, thank you again.

> 
> Best,
> David


On 2020-05-11 13:47, John Peterson wrote:
> On Sun, May 10, 2020 at 10:08 PM <ed...@op...> wrote:
> 
> This message is from libMesh (BTW what is libMesh++?):

libMesh++ is a hole in my brain from Elmer's documentation, sorry (not 
blaming it on them).

>> 
> 
> And these messages are from PETSc:
> 
>> 
> 
> I think this is all working as intended, since if you look at run.sh 
> for
> reduced_basis_ex7, you can see that we run all four combinations of
> "type"/"package" and "mumps"/superlu" from the script, relying on the 
> logic
> within the example itself to skip those cases which don't apply.

That is very ingenious. Noob question: Is there still a need to test for 
options that don't exist? I know there must be a reason behind it :P .

> The examples must be run from the build directory, so
> for example to test mumps with PETSC >= 3.9 (assuming 
> $LIBMESH_SRC/build is
> the location of your build directory):
> 
> cd $LIBMESH_SRC/build/examples/reduced_basis/reduced_basis_ex7
> ./example-opt -online_mode 0 -ksp_type preonly -pc_type lu
> -pc_factor_mat_solver_type mumps

Thank you very much for the very clear instructions.

> 
> Finally, there is one last check you can do, which is to look at 
> (again,
> from the build directory) the include/libmesh_config.h file and inspect 
> the
> values of the
> 
> LIBMESH_PETSC_HAVE_MUMPS
> LIBMESH_PETSC_HAVE_SUPERLU_DIST
> 
> preprocessor defines.

I really got it with this. It seems that SuperLU is not being used, but 
MUMPS is. I will check my PETSc compilation before asking further 
questions.

All of this was very useful. Thanks, dear David and John.

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