Looks like I posted to this list too soon. I got some good feedback from
one of the PETSc people on this, and the result works nicely. Satish Balay
writes:
We don't have fix for this problem yet. The current workarround is to
change the following in python/PETSc/packages/MPI.py from:
self.functions = ['MPI_Init', 'MPI_Comm_create', 'MPI_Allreduce']
to
self.functions = ['MPI_Init', 'MPI_Comm_create']
and rerun configure.
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