int smpi_coll_basic_alltoallv(void* sendbuf, int* sendcounts, int* senddisps, MPI_Datatype sendtype, void* recvbuf, int *recvcounts, int* recvdisps, MPI_Datatype recvtype, MPI_Comm comm);
// utilities
+void smpi_bench_destroy(void);
void smpi_bench_begin(int rank, const char* mpi_call);
void smpi_bench_end(int rank, const char* mpi_call);