/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */ /* * Copyright (c) 2004-2017 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 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", 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); }