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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2020 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2015-2018 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "mpi.h"
#include "opal/util/bit_ops.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_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 "ompi/mca/coll/base/coll_base_topo.h"
#include "ompi/mca/coll/base/coll_base_util.h"
/* allreduce algorithm variables */
static int coll_tuned_allreduce_forced_algorithm = 0;
static int coll_tuned_allreduce_segment_size = 0;
static int coll_tuned_allreduce_tree_fanout;
static int coll_tuned_allreduce_chain_fanout;
/* valid values for coll_tuned_allreduce_forced_algorithm */
static const mca_base_var_enum_value_t allreduce_algorithms[] = {
{0, "ignore"},
{1, "basic_linear"},
{2, "nonoverlapping"},
{3, "recursive_doubling"},
{4, "ring"},
{5, "segmented_ring"},
{6, "rabenseifner"},
{0, NULL}
};
/* 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)
{
mca_base_var_enum_t *new_enum;
int cnt;
for( cnt = 0; NULL != allreduce_algorithms[cnt].string; cnt++ );
ompi_coll_tuned_forced_max_algorithms[ALLREDUCE] = cnt;
(void) mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
"allreduce_algorithm_count",
"Number of allreduce algorithms available",
MCA_BASE_VAR_TYPE_INT, NULL, 0,
MCA_BASE_VAR_FLAG_DEFAULT_ONLY,
OPAL_INFO_LVL_5,
MCA_BASE_VAR_SCOPE_CONSTANT,
&ompi_coll_tuned_forced_max_algorithms[ALLREDUCE]);
/* MPI_T: This variable should eventually be bound to a communicator */
coll_tuned_allreduce_forced_algorithm = 0;
(void) mca_base_var_enum_create("coll_tuned_allreduce_algorithms", allreduce_algorithms, &new_enum);
mca_param_indices->algorithm_param_index =
mca_base_component_var_register(&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), 3 recursive doubling, 4 ring, 5 segmented ring. "
"Only relevant if coll_tuned_use_dynamic_rules is true.",
MCA_BASE_VAR_TYPE_INT, new_enum, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_5,
MCA_BASE_VAR_SCOPE_ALL,
&coll_tuned_allreduce_forced_algorithm);
OBJ_RELEASE(new_enum);
if (mca_param_indices->algorithm_param_index < 0) {
return mca_param_indices->algorithm_param_index;
}
coll_tuned_allreduce_segment_size = 0;
mca_param_indices->segsize_param_index =
mca_base_component_var_register(&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.",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_5,
MCA_BASE_VAR_SCOPE_ALL,
&coll_tuned_allreduce_segment_size);
coll_tuned_allreduce_tree_fanout = ompi_coll_tuned_init_tree_fanout; /* get system wide default */
mca_param_indices->tree_fanout_param_index =
mca_base_component_var_register(&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.",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_5,
MCA_BASE_VAR_SCOPE_ALL,
&coll_tuned_allreduce_tree_fanout);
coll_tuned_allreduce_chain_fanout = ompi_coll_tuned_init_chain_fanout; /* get system wide default */
mca_param_indices->chain_fanout_param_index =
mca_base_component_var_register(&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.",
MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_5,
MCA_BASE_VAR_SCOPE_ALL,
&coll_tuned_allreduce_chain_fanout);
return (MPI_SUCCESS);
}
int ompi_coll_tuned_allreduce_intra_do_this(const void *sbuf, void *rbuf, int count,
struct ompi_datatype_t *dtype,
struct ompi_op_t *op,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module,
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, module);
case (1):
return ompi_coll_base_allreduce_intra_basic_linear(sbuf, rbuf, count, dtype, op, comm, module);
case (2):
return ompi_coll_base_allreduce_intra_nonoverlapping(sbuf, rbuf, count, dtype, op, comm, module);
case (3):
return ompi_coll_base_allreduce_intra_recursivedoubling(sbuf, rbuf, count, dtype, op, comm, module);
case (4):
return ompi_coll_base_allreduce_intra_ring(sbuf, rbuf, count, dtype, op, comm, module);
case (5):
return ompi_coll_base_allreduce_intra_ring_segmented(sbuf, rbuf, count, dtype, op, comm, module, segsize);
case (6):
return ompi_coll_base_allreduce_intra_redscat_allgather(sbuf, rbuf, count, dtype, op, comm, module);
} /* switch */
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);
}
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