This source file includes following definitions.
- ompi_coll_tuned_allreduce_intra_check_forced_init
- ompi_coll_tuned_allreduce_intra_do_this
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15 #include "ompi_config.h"
16
17 #include "mpi.h"
18 #include "opal/util/bit_ops.h"
19 #include "ompi/constants.h"
20 #include "ompi/datatype/ompi_datatype.h"
21 #include "ompi/communicator/communicator.h"
22 #include "ompi/mca/coll/coll.h"
23 #include "ompi/mca/coll/base/coll_tags.h"
24 #include "ompi/mca/pml/pml.h"
25 #include "ompi/op/op.h"
26 #include "coll_tuned.h"
27 #include "ompi/mca/coll/base/coll_base_topo.h"
28 #include "ompi/mca/coll/base/coll_base_util.h"
29
30
31 static int coll_tuned_allreduce_forced_algorithm = 0;
32 static int coll_tuned_allreduce_segment_size = 0;
33 static int coll_tuned_allreduce_tree_fanout;
34 static int coll_tuned_allreduce_chain_fanout;
35
36
37 static mca_base_var_enum_value_t allreduce_algorithms[] = {
38 {0, "ignore"},
39 {1, "basic_linear"},
40 {2, "nonoverlapping"},
41 {3, "recursive_doubling"},
42 {4, "ring"},
43 {5, "segmented_ring"},
44 {6, "rabenseifner"},
45 {0, NULL}
46 };
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57 int ompi_coll_tuned_allreduce_intra_check_forced_init (coll_tuned_force_algorithm_mca_param_indices_t *mca_param_indices)
58 {
59 mca_base_var_enum_t *new_enum;
60 int cnt;
61
62 for( cnt = 0; NULL != allreduce_algorithms[cnt].string; cnt++ );
63 ompi_coll_tuned_forced_max_algorithms[ALLREDUCE] = cnt;
64
65 (void) mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
66 "allreduce_algorithm_count",
67 "Number of allreduce algorithms available",
68 MCA_BASE_VAR_TYPE_INT, NULL, 0,
69 MCA_BASE_VAR_FLAG_DEFAULT_ONLY,
70 OPAL_INFO_LVL_5,
71 MCA_BASE_VAR_SCOPE_CONSTANT,
72 &ompi_coll_tuned_forced_max_algorithms[ALLREDUCE]);
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75 coll_tuned_allreduce_forced_algorithm = 0;
76 (void) mca_base_var_enum_create("coll_tuned_allreduce_algorithms", allreduce_algorithms, &new_enum);
77 mca_param_indices->algorithm_param_index =
78 mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
79 "allreduce_algorithm",
80 "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",
81 MCA_BASE_VAR_TYPE_INT, new_enum, 0, MCA_BASE_VAR_FLAG_SETTABLE,
82 OPAL_INFO_LVL_5,
83 MCA_BASE_VAR_SCOPE_ALL,
84 &coll_tuned_allreduce_forced_algorithm);
85 OBJ_RELEASE(new_enum);
86 if (mca_param_indices->algorithm_param_index < 0) {
87 return mca_param_indices->algorithm_param_index;
88 }
89
90 coll_tuned_allreduce_segment_size = 0;
91 mca_param_indices->segsize_param_index =
92 mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
93 "allreduce_algorithm_segmentsize",
94 "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.",
95 MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
96 OPAL_INFO_LVL_5,
97 MCA_BASE_VAR_SCOPE_ALL,
98 &coll_tuned_allreduce_segment_size);
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100 coll_tuned_allreduce_tree_fanout = ompi_coll_tuned_init_tree_fanout;
101 mca_param_indices->tree_fanout_param_index =
102 mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
103 "allreduce_algorithm_tree_fanout",
104 "Fanout for n-tree used for allreduce algorithms. Only has meaning if algorithm is forced and supports n-tree topo based operation.",
105 MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
106 OPAL_INFO_LVL_5,
107 MCA_BASE_VAR_SCOPE_ALL,
108 &coll_tuned_allreduce_tree_fanout);
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110 coll_tuned_allreduce_chain_fanout = ompi_coll_tuned_init_chain_fanout;
111 mca_param_indices->chain_fanout_param_index =
112 mca_base_component_var_register(&mca_coll_tuned_component.super.collm_version,
113 "allreduce_algorithm_chain_fanout",
114 "Fanout for chains used for allreduce algorithms. Only has meaning if algorithm is forced and supports chain topo based operation.",
115 MCA_BASE_VAR_TYPE_INT, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
116 OPAL_INFO_LVL_5,
117 MCA_BASE_VAR_SCOPE_ALL,
118 &coll_tuned_allreduce_chain_fanout);
119
120 return (MPI_SUCCESS);
121 }
122
123 int ompi_coll_tuned_allreduce_intra_do_this(const void *sbuf, void *rbuf, int count,
124 struct ompi_datatype_t *dtype,
125 struct ompi_op_t *op,
126 struct ompi_communicator_t *comm,
127 mca_coll_base_module_t *module,
128 int algorithm, int faninout, int segsize)
129 {
130 OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_do_this algorithm %d topo fan in/out %d segsize %d",
131 algorithm, faninout, segsize));
132
133 switch (algorithm) {
134 case (0):
135 return ompi_coll_tuned_allreduce_intra_dec_fixed(sbuf, rbuf, count, dtype, op, comm, module);
136 case (1):
137 return ompi_coll_base_allreduce_intra_basic_linear(sbuf, rbuf, count, dtype, op, comm, module);
138 case (2):
139 return ompi_coll_base_allreduce_intra_nonoverlapping(sbuf, rbuf, count, dtype, op, comm, module);
140 case (3):
141 return ompi_coll_base_allreduce_intra_recursivedoubling(sbuf, rbuf, count, dtype, op, comm, module);
142 case (4):
143 return ompi_coll_base_allreduce_intra_ring(sbuf, rbuf, count, dtype, op, comm, module);
144 case (5):
145 return ompi_coll_base_allreduce_intra_ring_segmented(sbuf, rbuf, count, dtype, op, comm, module, segsize);
146 case (6):
147 return ompi_coll_base_allreduce_intra_redscat_allgather(sbuf, rbuf, count, dtype, op, comm, module);
148 }
149 OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_do_this attempt to select algorithm %d when only 0-%d is valid?",
150 algorithm, ompi_coll_tuned_forced_max_algorithms[ALLREDUCE]));
151 return (MPI_ERR_ARG);
152 }