> On 07-Mar-2018, at 9:34 PM, Smith, Barry F. <bsm...@mcs.anl.gov> wrote:
>   Start with one use statement and slowly add more. My guess is multiple ones 
> of those modules use the MPI module hence MPI_SUM appears through multiple 
> paths.
>   Barry

Hello Barry

If you mean use of “use mpi”, then I have dont have this anywhere in my code. I 
only include petsc includes and modules.


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