/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* (C) 2001 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpiimpl.h"
/* Remote Gather Local Bcast
*
* This is done differently from the intercommunicator allgather
* because we don't have all the information to do a local
* intracommunictor gather (sendcount can be different on each
* process). Therefore, we do the following: Each group first does an
* intercommunicator gather to rank 0 and then does an
* intracommunicator broadcast.
*/
#undef FUNCNAME
#define FUNCNAME MPIR_Allgatherv_inter_remote_gather_local_bcast
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Allgatherv_inter_remote_gather_local_bcast(const void *sendbuf, int sendcount,
MPI_Datatype sendtype, void *recvbuf,
const int *recvcounts, const int
*displs, MPI_Datatype recvtype,
MPIR_Comm * comm_ptr, MPIR_Errflag_t * errflag)
{
int remote_size, mpi_errno, root, rank;
int mpi_errno_ret = MPI_SUCCESS;
MPIR_Comm *newcomm_ptr = NULL;
MPI_Datatype newtype = MPI_DATATYPE_NULL;
remote_size = comm_ptr->remote_size;
rank = comm_ptr->rank;
/* first do an intercommunicator gatherv from left to right group,
* then from right to left group */
if (comm_ptr->is_low_group) {
/* gatherv from right group */
root = (rank == 0) ? MPI_ROOT : MPI_PROC_NULL;
mpi_errno = MPIR_Gatherv(sendbuf, sendcount, sendtype, recvbuf,
recvcounts, displs, recvtype, root, comm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag =
MPIX_ERR_PROC_FAILED ==
MPIR_ERR_GET_CLASS(mpi_errno) ? MPIR_ERR_PROC_FAILED : MPIR_ERR_OTHER;
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
/* gatherv to right group */
root = 0;
mpi_errno = MPIR_Gatherv(sendbuf, sendcount, sendtype, recvbuf,
recvcounts, displs, recvtype, root, comm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag =
MPIX_ERR_PROC_FAILED ==
MPIR_ERR_GET_CLASS(mpi_errno) ? MPIR_ERR_PROC_FAILED : MPIR_ERR_OTHER;
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
} else {
/* gatherv to left group */
root = 0;
mpi_errno = MPIR_Gatherv(sendbuf, sendcount, sendtype, recvbuf,
recvcounts, displs, recvtype, root, comm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag =
MPIX_ERR_PROC_FAILED ==
MPIR_ERR_GET_CLASS(mpi_errno) ? MPIR_ERR_PROC_FAILED : MPIR_ERR_OTHER;
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
/* gatherv from left group */
root = (rank == 0) ? MPI_ROOT : MPI_PROC_NULL;
mpi_errno = MPIR_Gatherv(sendbuf, sendcount, sendtype, recvbuf,
recvcounts, displs, recvtype, root, comm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag =
MPIX_ERR_PROC_FAILED ==
MPIR_ERR_GET_CLASS(mpi_errno) ? MPIR_ERR_PROC_FAILED : MPIR_ERR_OTHER;
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
}
/* now do an intracommunicator broadcast within each group. we use
* a derived datatype to handle the displacements */
/* Get the local intracommunicator */
if (!comm_ptr->local_comm) {
mpi_errno = MPII_Setup_intercomm_localcomm(comm_ptr);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
}
newcomm_ptr = comm_ptr->local_comm;
mpi_errno = MPIR_Type_indexed_impl(remote_size, recvcounts, displs, recvtype, &newtype);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
mpi_errno = MPIR_Type_commit_impl(&newtype);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
mpi_errno = MPIR_Bcast_intra_auto(recvbuf, 1, newtype, 0, newcomm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag =
MPIX_ERR_PROC_FAILED ==
MPIR_ERR_GET_CLASS(mpi_errno) ? MPIR_ERR_PROC_FAILED : MPIR_ERR_OTHER;
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
MPIR_Type_free_impl(&newtype);
fn_exit:
if (mpi_errno_ret)
mpi_errno = mpi_errno_ret;
else if (*errflag != MPIR_ERR_NONE)
MPIR_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**coll_fail");
return mpi_errno;
fn_fail:
/* --BEGIN ERROR HANDLING-- */
if (newtype != MPI_DATATYPE_NULL)
MPIR_Type_free_impl(&newtype);
goto fn_exit;
/* --END ERROR HANDLING-- */
}