On Sun, 26 Feb 2023, Pierre Jolivet wrote: > > > > On 25 Feb 2023, at 11:44 PM, Long, Jianbo <[email protected]> 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).
even if you build with mpich/openmpi - you can run sequentially without mpiexec - i.e: ./binary One reason to do this [instead of building PETSc with --with-mpi=0] - is if you are mixing in multiple pkgs that have MPI dependencies [in which case - its best to build all these pkgs with the same mpich or openmpi - but still run sequentially]. Satish > 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 > >
