/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
* (C) 2017 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpiimpl.h"
/*
* Linear
*
* Simple send to each outgoing neighbor and recv from each incoming
* neighbor.
*/
#undef FUNCNAME
#define FUNCNAME MPIR_Ineighbor_allgatherv_sched_allcomm_linear
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Ineighbor_allgatherv_sched_allcomm_linear(const void *sendbuf, int sendcount,
MPI_Datatype sendtype, void *recvbuf,
const int recvcounts[], const int displs[],
MPI_Datatype recvtype, MPIR_Comm * comm_ptr,
MPIR_Sched_t s)
{
int mpi_errno = MPI_SUCCESS;
int indegree, outdegree, weighted;
int i, k, l;
int *srcs, *dsts;
int comm_size;
MPI_Aint recvtype_extent;
MPIR_CHKLMEM_DECL(2);
comm_size = comm_ptr->local_size;
MPIR_Datatype_get_extent_macro(recvtype, recvtype_extent);
for (i = 0; i < comm_size; ++i) {
MPIR_Ensure_Aint_fits_in_pointer(MPIR_VOID_PTR_CAST_TO_MPI_AINT recvbuf +
(displs[i] * recvtype_extent));
}
mpi_errno = MPIR_Topo_canon_nhb_count(comm_ptr, &indegree, &outdegree, &weighted);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
MPIR_CHKLMEM_MALLOC(srcs, int *, indegree * sizeof(int), mpi_errno, "srcs", MPL_MEM_COMM);
MPIR_CHKLMEM_MALLOC(dsts, int *, outdegree * sizeof(int), mpi_errno, "dsts", MPL_MEM_COMM);
mpi_errno = MPIR_Topo_canon_nhb(comm_ptr,
indegree, srcs, MPI_UNWEIGHTED,
outdegree, dsts, MPI_UNWEIGHTED);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
for (k = 0; k < outdegree; ++k) {
mpi_errno = MPIR_Sched_send(sendbuf, sendcount, sendtype, dsts[k], comm_ptr, s);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
}
for (l = 0; l < indegree; ++l) {
char *rb = ((char *) recvbuf) + displs[l] * recvtype_extent;
mpi_errno = MPIR_Sched_recv(rb, recvcounts[l], recvtype, srcs[l], comm_ptr, s);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
}
MPIR_SCHED_BARRIER(s);
fn_exit:
MPIR_CHKLMEM_FREEALL();
return mpi_errno;
fn_fail:
goto fn_exit;
}