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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2016 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2015 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2016 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2017 IBM Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_basic.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/coll/base/coll_tags.h"
#include "coll_basic.h"
#include "ompi/mca/pml/pml.h"
#include "opal/util/bit_ops.h"
/*
* bcast_log_intra
*
* Function: - broadcast using O(log(N)) algorithm
* Accepts: - same arguments as MPI_Bcast()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_bcast_log_intra(void *buff, int count,
struct ompi_datatype_t *datatype, int root,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i;
int size;
int rank;
int vrank;
int peer;
int dim;
int hibit;
int mask;
int err;
int nreqs;
ompi_request_t **preq, **reqs;
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
vrank = (rank + size - root) % size;
dim = comm->c_cube_dim;
hibit = opal_hibit(vrank, dim);
--dim;
/* Receive data from parent in the tree. */
if (vrank > 0) {
assert(hibit >= 0);
peer = ((vrank & ~(1 << hibit)) + root) % size;
err = MCA_PML_CALL(recv(buff, count, datatype, peer,
MCA_COLL_BASE_TAG_BCAST,
comm, MPI_STATUS_IGNORE));
if (MPI_SUCCESS != err) {
return err;
}
}
/* Send data to the children. */
reqs = ompi_coll_base_comm_get_reqs(module->base_data, size);
if( NULL == reqs ) { return OMPI_ERR_OUT_OF_RESOURCE; }
err = MPI_SUCCESS;
preq = reqs;
nreqs = 0;
for (i = hibit + 1, mask = 1 << i; i <= dim; ++i, mask <<= 1) {
peer = vrank | mask;
if (peer < size) {
peer = (peer + root) % size;
++nreqs;
err = MCA_PML_CALL(isend(buff, count, datatype, peer,
MCA_COLL_BASE_TAG_BCAST,
MCA_PML_BASE_SEND_STANDARD,
comm, preq++));
if (MPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, nreqs);
return err;
}
}
}
/* Start and wait on all requests. */
if (nreqs > 0) {
/* Wait for them all. If there's an error, note that we don't
* care what the error was -- just that there *was* an error.
* The PML will finish all requests, even if one or more of them
* fail. i.e., by the end of this call, all the requests are
* free-able. So free them anyway -- even if there was an
* error, and return the error after we free everything. */
err = ompi_request_wait_all(nreqs, reqs, MPI_STATUSES_IGNORE);
if( MPI_SUCCESS != err ) {
ompi_coll_base_free_reqs(reqs, nreqs);
}
}
/* All done */
return err;
}
/*
* bcast_lin_inter
*
* Function: - broadcast using O(N) algorithm
* Accepts: - same arguments as MPI_Bcast()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_bcast_lin_inter(void *buff, int count,
struct ompi_datatype_t *datatype, int root,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i;
int rsize;
int err;
ompi_request_t **reqs = NULL;
rsize = ompi_comm_remote_size(comm);
if (MPI_PROC_NULL == root) {
/* do nothing */
err = OMPI_SUCCESS;
} else if (MPI_ROOT != root) {
/* Non-root receive the data. */
err = MCA_PML_CALL(recv(buff, count, datatype, root,
MCA_COLL_BASE_TAG_BCAST, comm,
MPI_STATUS_IGNORE));
} else {
reqs = ompi_coll_base_comm_get_reqs(module->base_data, rsize);
if( NULL == reqs ) { return OMPI_ERR_OUT_OF_RESOURCE; }
/* root section */
for (i = 0; i < rsize; i++) {
err = MCA_PML_CALL(isend(buff, count, datatype, i,
MCA_COLL_BASE_TAG_BCAST,
MCA_PML_BASE_SEND_STANDARD,
comm, &(reqs[i])));
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, i + 1);
return err;
}
}
err = ompi_request_wait_all(rsize, reqs, MPI_STATUSES_IGNORE);
if (OMPI_SUCCESS != err) {
ompi_coll_base_free_reqs(reqs, rsize);
}
}
/* All done */
return err;
}
/*
* bcast_log_inter
*
* Function: - broadcast using O(N) algorithm
* Accepts: - same arguments as MPI_Bcast()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_bcast_log_inter(void *buff, int count,
struct ompi_datatype_t *datatype, int root,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
return OMPI_ERR_NOT_IMPLEMENTED;
}
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