234 строки
10 KiB
C
234 строки
10 KiB
C
/*
|
|
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
|
|
* University Research and Technology
|
|
* Corporation. All rights reserved.
|
|
* Copyright (c) 2004-2006 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.
|
|
* $COPYRIGHT$
|
|
*
|
|
* Additional copyrights may follow
|
|
*
|
|
* $HEADER$
|
|
*/
|
|
|
|
#include "ompi_config.h"
|
|
|
|
#include "mpi.h"
|
|
#include "ompi/constants.h"
|
|
#include "ompi/datatype/datatype.h"
|
|
#include "ompi/communicator/communicator.h"
|
|
#include "ompi/mca/coll/coll.h"
|
|
#include "ompi/mca/coll/base/coll_tags.h"
|
|
#include "ompi/mca/pml/pml.h"
|
|
#include "ompi/op/op.h"
|
|
#include "coll_tuned.h"
|
|
#include "coll_tuned_topo.h"
|
|
|
|
/*
|
|
* ompi_coll_tuned_allreduce_intra_nonoverlapping
|
|
*
|
|
* This function just calls a reduce followed by a broadcast
|
|
* both called functions are tuned but they complete sequentially,
|
|
* i.e. no additional overlapping
|
|
* meaning if the number of segments used is greater than the topo depth
|
|
* then once the first segment of data is fully 'reduced' it is not broadcast
|
|
* while the reduce continues (cost = cost-reduce + cost-bcast + decision x 3)
|
|
*
|
|
*/
|
|
int
|
|
ompi_coll_tuned_allreduce_intra_nonoverlapping(void *sbuf, void *rbuf, int count,
|
|
struct ompi_datatype_t *dtype,
|
|
struct ompi_op_t *op,
|
|
struct ompi_communicator_t *comm)
|
|
{
|
|
int err;
|
|
int rank;
|
|
|
|
rank = ompi_comm_rank(comm);
|
|
|
|
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_nonoverlapping rank %d", rank));
|
|
|
|
/* Reduce to 0 and broadcast. */
|
|
|
|
if (MPI_IN_PLACE == sbuf) {
|
|
if (0 == ompi_comm_rank(comm)) {
|
|
err = comm->c_coll.coll_reduce (MPI_IN_PLACE, rbuf, count, dtype, op, 0, comm);
|
|
} else {
|
|
err = comm->c_coll.coll_reduce (rbuf, NULL, count, dtype, op, 0, comm);
|
|
}
|
|
} else {
|
|
err = comm->c_coll.coll_reduce (sbuf, rbuf, count, dtype, op, 0, comm);
|
|
}
|
|
if (MPI_SUCCESS != err) {
|
|
return err;
|
|
}
|
|
|
|
return comm->c_coll.coll_bcast (rbuf, count, dtype, 0, comm);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Linear functions are copied from the BASIC coll module
|
|
* they do not segment the message and are simple implementations
|
|
* but for some small number of nodes and/or small data sizes they
|
|
* are just as fast as tuned/tree based segmenting operations
|
|
* and as such may be selected by the decision functions
|
|
* These are copied into this module due to the way we select modules
|
|
* in V1. i.e. in V2 we will handle this differently and so will not
|
|
* have to duplicate code.
|
|
* GEF Oct05 after asking Jeff.
|
|
*/
|
|
|
|
/* copied function (with appropriate renaming) starts here */
|
|
|
|
|
|
/*
|
|
* allreduce_intra
|
|
*
|
|
* Function: - allreduce using other MPI collectives
|
|
* Accepts: - same as MPI_Allreduce()
|
|
* Returns: - MPI_SUCCESS or error code
|
|
*/
|
|
int
|
|
ompi_coll_tuned_allreduce_intra_basic_linear(void *sbuf, void *rbuf, int count,
|
|
struct ompi_datatype_t *dtype,
|
|
struct ompi_op_t *op,
|
|
struct ompi_communicator_t *comm)
|
|
{
|
|
int err;
|
|
int rank;
|
|
|
|
rank = ompi_comm_rank(comm);
|
|
|
|
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_basic_linear rank %d", rank));
|
|
|
|
/* Reduce to 0 and broadcast. */
|
|
|
|
if (MPI_IN_PLACE == sbuf) {
|
|
if (0 == ompi_comm_rank(comm)) {
|
|
err = ompi_coll_tuned_reduce_intra_basic_linear (MPI_IN_PLACE, rbuf, count, dtype, op, 0, comm);
|
|
} else {
|
|
err = ompi_coll_tuned_reduce_intra_basic_linear(rbuf, NULL, count, dtype, op, 0, comm);
|
|
}
|
|
} else {
|
|
err = ompi_coll_tuned_reduce_intra_basic_linear(sbuf, rbuf, count, dtype, op, 0, comm);
|
|
}
|
|
if (MPI_SUCCESS != err) {
|
|
return err;
|
|
}
|
|
|
|
return ompi_coll_tuned_bcast_intra_basic_linear(rbuf, count, dtype, 0, comm);
|
|
}
|
|
|
|
|
|
/* copied function (with appropriate renaming) ends here */
|
|
|
|
/* The following are used by dynamic and forced rules */
|
|
|
|
/* publish details of each algorithm and if its forced/fixed/locked in */
|
|
/* as you add methods/algorithms you must update this and the query/map routines */
|
|
|
|
/* this routine is called by the component only */
|
|
/* this makes sure that the mca parameters are set to their initial values and perms */
|
|
/* module does not call this they call the forced_getvalues routine instead */
|
|
|
|
int ompi_coll_tuned_allreduce_intra_check_forced_init (coll_tuned_force_algorithm_mca_param_indices_t *mca_param_indices)
|
|
{
|
|
int rc, max_alg = 2, requested_alg;
|
|
|
|
ompi_coll_tuned_forced_max_algorithms[ALLREDUCE] = max_alg;
|
|
|
|
rc = mca_base_param_reg_int (&mca_coll_tuned_component.super.collm_version,
|
|
"allreduce_algorithm_count",
|
|
"Number of allreduce algorithms available",
|
|
false, true, max_alg, NULL);
|
|
|
|
mca_param_indices->algorithm_param_index
|
|
= mca_base_param_reg_int( &mca_coll_tuned_component.super.collm_version,
|
|
"allreduce_algorithm",
|
|
"Which allreduce algorithm is used. Can be locked down to any of: 0 ignore, 1 basic linear, 2 nonoverlapping (tuned reduce + tuned bcast)",
|
|
false, false, 0, NULL);
|
|
mca_base_param_lookup_int( mca_param_indices->algorithm_param_index, &(requested_alg));
|
|
if( requested_alg > max_alg ) {
|
|
if( 0 == ompi_comm_rank( MPI_COMM_WORLD ) ) {
|
|
opal_output( 0, "Allreduce algorithm #%d is not available (range [0..%d]). Switching back to ignore(0)\n",
|
|
requested_alg, max_alg );
|
|
}
|
|
mca_base_param_set_int( mca_param_indices->algorithm_param_index, 0);
|
|
}
|
|
|
|
mca_param_indices->segsize_param_index
|
|
= mca_base_param_reg_int( &mca_coll_tuned_component.super.collm_version,
|
|
"allreduce_algorithm_segmentsize",
|
|
"Segment size in bytes used by default for allreduce algorithms. Only has meaning if algorithm is forced and supports segmenting. 0 bytes means no segmentation.",
|
|
false, false, 0, NULL);
|
|
|
|
mca_param_indices->tree_fanout_param_index
|
|
= mca_base_param_reg_int( &mca_coll_tuned_component.super.collm_version,
|
|
"allreduce_algorithm_tree_fanout",
|
|
"Fanout for n-tree used for allreduce algorithms. Only has meaning if algorithm is forced and supports n-tree topo based operation.",
|
|
false, false, ompi_coll_tuned_init_tree_fanout, /* get system wide default */
|
|
NULL);
|
|
|
|
mca_param_indices->chain_fanout_param_index
|
|
= mca_base_param_reg_int( &mca_coll_tuned_component.super.collm_version,
|
|
"allreduce_algorithm_chain_fanout",
|
|
"Fanout for chains used for allreduce algorithms. Only has meaning if algorithm is forced and supports chain topo based operation.",
|
|
false, false,
|
|
ompi_coll_tuned_init_chain_fanout, /* get system wide default */
|
|
NULL);
|
|
|
|
return (MPI_SUCCESS);
|
|
}
|
|
|
|
|
|
int ompi_coll_tuned_allreduce_intra_do_forced(void *sbuf, void *rbuf, int count,
|
|
struct ompi_datatype_t *dtype,
|
|
struct ompi_op_t *op,
|
|
struct ompi_communicator_t *comm)
|
|
{
|
|
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_do_forced selected algorithm %d",
|
|
comm->c_coll_selected_data->user_forced[ALLREDUCE].algorithm));
|
|
|
|
switch (comm->c_coll_selected_data->user_forced[ALLREDUCE].algorithm) {
|
|
case (0): return ompi_coll_tuned_allreduce_intra_dec_fixed (sbuf, rbuf, count, dtype, op, comm);
|
|
case (1): return ompi_coll_tuned_allreduce_intra_basic_linear (sbuf, rbuf, count, dtype, op, comm);
|
|
case (2): return ompi_coll_tuned_allreduce_intra_nonoverlapping (sbuf, rbuf, count, dtype, op, comm);
|
|
default:
|
|
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_do_forced attempt to select algorithm %d when only 0-%d is valid?",
|
|
comm->c_coll_selected_data->user_forced[ALLREDUCE].algorithm,
|
|
ompi_coll_tuned_forced_max_algorithms[ALLREDUCE]));
|
|
return (MPI_ERR_ARG);
|
|
} /* switch */
|
|
|
|
}
|
|
|
|
|
|
int ompi_coll_tuned_allreduce_intra_do_this(void *sbuf, void *rbuf, int count,
|
|
struct ompi_datatype_t *dtype,
|
|
struct ompi_op_t *op,
|
|
struct ompi_communicator_t *comm,
|
|
int algorithm, int faninout, int segsize)
|
|
{
|
|
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_do_this algorithm %d topo fan in/out %d segsize %d",
|
|
algorithm, faninout, segsize));
|
|
|
|
switch (algorithm) {
|
|
case (0): return ompi_coll_tuned_allreduce_intra_dec_fixed (sbuf, rbuf, count, dtype, op, comm);
|
|
case (1): return ompi_coll_tuned_allreduce_intra_basic_linear (sbuf, rbuf, count, dtype, op, comm);
|
|
case (2): return ompi_coll_tuned_allreduce_intra_nonoverlapping (sbuf, rbuf, count, dtype, op, comm);
|
|
default:
|
|
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_do_this attempt to select algorithm %d when only 0-%d is valid?",
|
|
algorithm, ompi_coll_tuned_forced_max_algorithms[ALLREDUCE]));
|
|
return (MPI_ERR_ARG);
|
|
} /* switch */
|
|
|
|
}
|
|
|