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Runtime error on macOS: reduction MPI_SUM is not defined on MPI_INTEGER

Summary

Runtime error on macOS: reduction MPI_SUM is not defined on MPI_INTEGER

Steps to reproduce

Run spiral inflector simulation

What is the current bug behavior?

run-time error

Relevant logs and/or screenshots

OPAL> * --------------------------------- Start tracking ------------------------------------ *
[Nimloth:21640] *** An error occurred in MPI_Scan: the reduction operation MPI_SUM is not defined on the MPI_INTEGER datatype
[Nimloth:21640] *** reported by process [922615809,0]
[Nimloth:21640] *** on communicator MPI_COMM_WORLD
[Nimloth:21640] *** MPI_ERR_OP: invalid reduce operation
[Nimloth:21640] *** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
[Nimloth:21640] ***    and potentially your MPI job)

Possible fixes

MPI_INTEGER is a type for Fortran, use MPI_INT instead.