ba83cc91eb
Implements MPI_Bcast using a binomial tree scatter followed by a ring allgather. Signed-off-by: Mikhail Kurnosov <mkurnosov@gmail.com>
171 строка
8.7 KiB
C
171 строка
8.7 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2004-2017 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2015 Research Organization for Information Science
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* and Technology (RIST). All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include "mpi.h"
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#include "ompi/constants.h"
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#include "ompi/datatype/ompi_datatype.h"
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#include "ompi/communicator/communicator.h"
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#include "ompi/mca/coll/coll.h"
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#include "ompi/mca/coll/base/coll_tags.h"
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#include "ompi/mca/pml/pml.h"
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#include "coll_tuned.h"
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#include "ompi/mca/coll/base/coll_base_topo.h"
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#include "ompi/mca/coll/base/coll_base_util.h"
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/* bcast algorithm variables */
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static int coll_tuned_bcast_forced_algorithm = 0;
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static int coll_tuned_bcast_segment_size = 0;
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static int coll_tuned_bcast_tree_fanout;
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static int coll_tuned_bcast_chain_fanout;
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/* k-nomial tree radix for the bcast algorithm (>= 2) */
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static int coll_tuned_bcast_knomial_radix = 4;
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/* valid values for coll_tuned_bcast_forced_algorithm */
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static mca_base_var_enum_value_t bcast_algorithms[] = {
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{0, "ignore"},
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{1, "basic_linear"},
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{2, "chain"},
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{3, "pipeline"},
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{4, "split_binary_tree"},
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{5, "binary_tree"},
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{6, "binomial"},
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{7, "knomial"},
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{8, "scatter_allgather"},
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{9, "scatter_allgather_ring"},
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{0, NULL}
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};
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/* The following are used by dynamic and forced rules */
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/* publish details of each algorithm and if its forced/fixed/locked in */
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/* as you add methods/algorithms you must update this and the query/map routines */
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/* this routine is called by the component only */
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/* this makes sure that the mca parameters are set to their initial values and perms */
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/* module does not call this they call the forced_getvalues routine instead */
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int ompi_coll_tuned_bcast_intra_check_forced_init (coll_tuned_force_algorithm_mca_param_indices_t *mca_param_indices)
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{
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mca_base_var_enum_t *new_enum;
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int cnt;
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for( cnt = 0; NULL != bcast_algorithms[cnt].string; cnt++ );
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ompi_coll_tuned_forced_max_algorithms[BCAST] = cnt;
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(void) mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
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"bcast_algorithm_count",
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"Number of bcast algorithms available",
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MCA_BASE_VAR_TYPE_INT, NULL, 0,
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MCA_BASE_VAR_FLAG_DEFAULT_ONLY,
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OPAL_INFO_LVL_5,
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MCA_BASE_VAR_SCOPE_CONSTANT,
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&ompi_coll_tuned_forced_max_algorithms[BCAST]);
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/* MPI_T: This variable should eventually be bound to a communicator */
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coll_tuned_bcast_forced_algorithm = 0;
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(void) mca_base_var_enum_create("coll_tuned_bcast_algorithms", bcast_algorithms, &new_enum);
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mca_param_indices->algorithm_param_index =
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mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
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"bcast_algorithm",
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"Which bcast algorithm is used. Can be locked down to choice of: 0 ignore, 1 basic linear, 2 chain, 3: pipeline, 4: split binary tree, 5: binary tree, 6: binomial tree, 7: knomial tree, 8: scatter_allgather, 9: scatter_allgather_ring.",
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MCA_BASE_VAR_TYPE_INT, new_enum, 0, MCA_BASE_VAR_FLAG_SETTABLE,
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OPAL_INFO_LVL_5,
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MCA_BASE_VAR_SCOPE_ALL,
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&coll_tuned_bcast_forced_algorithm);
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OBJ_RELEASE(new_enum);
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if (mca_param_indices->algorithm_param_index < 0) {
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return mca_param_indices->algorithm_param_index;
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}
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coll_tuned_bcast_segment_size = 0;
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mca_param_indices->segsize_param_index =
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mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
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"bcast_algorithm_segmentsize",
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"Segment size in bytes used by default for bcast algorithms. Only has meaning if algorithm is forced and supports segmenting. 0 bytes means no segmentation.",
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MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
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OPAL_INFO_LVL_5,
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MCA_BASE_VAR_SCOPE_ALL,
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&coll_tuned_bcast_segment_size);
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coll_tuned_bcast_tree_fanout = ompi_coll_tuned_init_tree_fanout; /* get system wide default */
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mca_param_indices->tree_fanout_param_index =
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mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
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"bcast_algorithm_tree_fanout",
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"Fanout for n-tree used for bcast algorithms. Only has meaning if algorithm is forced and supports n-tree topo based operation.",
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MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
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OPAL_INFO_LVL_5,
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MCA_BASE_VAR_SCOPE_ALL,
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&coll_tuned_bcast_tree_fanout);
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coll_tuned_bcast_chain_fanout = ompi_coll_tuned_init_chain_fanout; /* get system wide default */
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mca_param_indices->chain_fanout_param_index =
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mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
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"bcast_algorithm_chain_fanout",
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"Fanout for chains used for bcast algorithms. Only has meaning if algorithm is forced and supports chain topo based operation.",
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MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
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OPAL_INFO_LVL_5,
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MCA_BASE_VAR_SCOPE_ALL,
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&coll_tuned_bcast_chain_fanout);
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coll_tuned_bcast_knomial_radix = 4;
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mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
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"bcast_algorithm_knomial_radix",
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"k-nomial tree radix for the bcast algorithm (radix > 1).",
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MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
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OPAL_INFO_LVL_5, MCA_BASE_VAR_SCOPE_ALL,
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&coll_tuned_bcast_knomial_radix);
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return (MPI_SUCCESS);
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}
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int ompi_coll_tuned_bcast_intra_do_this(void *buf, int count,
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struct ompi_datatype_t *dtype,
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int root,
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struct ompi_communicator_t *comm,
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mca_coll_base_module_t *module,
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int algorithm, int faninout, int segsize)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:bcast_intra_do_this algorithm %d topo faninout %d segsize %d",
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algorithm, faninout, segsize));
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switch (algorithm) {
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case (0):
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return ompi_coll_tuned_bcast_intra_dec_fixed( buf, count, dtype, root, comm, module );
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case (1):
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return ompi_coll_base_bcast_intra_basic_linear( buf, count, dtype, root, comm, module );
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case (2):
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return ompi_coll_base_bcast_intra_chain( buf, count, dtype, root, comm, module, segsize, faninout );
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case (3):
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return ompi_coll_base_bcast_intra_pipeline( buf, count, dtype, root, comm, module, segsize );
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case (4):
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return ompi_coll_base_bcast_intra_split_bintree( buf, count, dtype, root, comm, module, segsize );
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case (5):
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return ompi_coll_base_bcast_intra_bintree( buf, count, dtype, root, comm, module, segsize );
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case (6):
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return ompi_coll_base_bcast_intra_binomial( buf, count, dtype, root, comm, module, segsize );
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case (7):
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return ompi_coll_base_bcast_intra_knomial(buf, count, dtype, root, comm, module,
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segsize, coll_tuned_bcast_knomial_radix);
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case (8):
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return ompi_coll_base_bcast_intra_scatter_allgather(buf, count, dtype, root, comm, module, segsize);
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case (9):
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return ompi_coll_base_bcast_intra_scatter_allgather_ring(buf, count, dtype, root, comm, module, segsize);
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} /* switch */
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OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:bcast_intra_do_this attempt to select algorithm %d when only 0-%d is valid?",
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algorithm, ompi_coll_tuned_forced_max_algorithms[BCAST]));
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return (MPI_ERR_ARG);
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}
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