Here is what I found.

I can build petsc with -with-mpi=0

Then I configured libmesh with --enable_petsc.

Libmesh took mpiuni implementation  from PETSc.

1.4.1 was compiled okay, and my application works fine.

1.5.0 had compilation errors, I could not built in.

On 11/19/2019 6:05 PM, Stogner, Roy H wrote:
> On Tue, 19 Nov 2019, Povolotskyi, Mykhailo wrote:
>
>> is it possible to build petsc without MPI and configure libmesh with
>> --enable_petsc and --disable_mpi?
> In theory, yes.
>
> In practice, I don't think that configuration is still in CI, so it
> wouldn't surprise me if 1.5.0 or master or both were broken in that
> case.  If you run into any problems, please let us know!
> ---
> Roy

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