Hello,
When I do MPI_Neighbor_alltoallv or MPI_Ineighbor_alltoallv, I find when
either outdegree or indegree is zero, OpenMPI will return an error. The
suspicious code is at pneighbor_alltoallv.c / pineighbor_alltoallv.c
101 } else if ((NULL == sendcounts) || (NULL == sdispls) ||
102 (NULL == recvcounts) || (NULL == rdispls) ||
103 MPI_IN_PLACE == sendbuf || MPI_IN_PLACE == recvbuf) {
104 return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
105 }
Apparently, the counts, displs error-checking should only be done when degree
!= 0.
Thanks.
--Junchao Zhang
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