[petsc-users] petsc compiled without MPI

[Pierre Jolivet]

> On 25 Feb 2023, at 11:44 PM, Long, Jianbo <jl7037 at mun.ca> wrote:
> 
> Hello,
> 
> For some of my applications, I need to use petsc without mpi, or use it sequentially. I wonder where I can find examples/tutorials for this ?

You can run sequentially with just a single MPI process (-n 1).
If you need to run without MPI whatsoever, you’ll need to have a separate PETSc installation which was configured --with-mpi=0
In both cases, the same user-code will run, i.e., all PETSc examples available with the sources will work (though some are designed purely for parallel experiments and may error out early on purpose).

Thanks,
Pierre

> Thanks very much,
> Jianbo Long

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