-int Coll_reduce_scatter_gather::reduce(const void *sendbuf, void *recvbuf,
- int count, MPI_Datatype datatype,
- MPI_Op op, int root, MPI_Comm comm)
+int reduce__scatter_gather(const void *sendbuf, void *recvbuf,
+ int count, MPI_Datatype datatype,
+ MPI_Op op, int root, MPI_Comm comm)