1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2017 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 (c) 2015-2017 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2017 IBM Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_basic.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/op/op.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/coll/base/coll_tags.h"
#include "ompi/mca/coll/base/coll_base_util.h"
#include "coll_basic.h"
#include "ompi/mca/pml/pml.h"
/*
* allreduce_intra
*
* Function: - allreduce using other MPI collectives
* Accepts: - same as MPI_Allreduce()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_allreduce_intra(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 err;
/* 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, comm->c_coll->coll_reduce_module);
} else {
err = comm->c_coll->coll_reduce(rbuf, NULL, count, dtype, op, 0, comm, comm->c_coll->coll_reduce_module);
}
} else {
err = comm->c_coll->coll_reduce(sbuf, rbuf, count, dtype, op, 0, comm, comm->c_coll->coll_reduce_module);
}
if (MPI_SUCCESS != err) {
return err;
}
return comm->c_coll->coll_bcast(rbuf, count, dtype, 0, comm, comm->c_coll->coll_bcast_module);
}
/*
* allreduce_inter
*
* Function: - allreduce using other MPI collectives
* Accepts: - same as MPI_Allreduce()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_basic_allreduce_inter(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 err, i, rank, root = 0, rsize, line;
ptrdiff_t extent, dsize, gap;
char *tmpbuf = NULL, *pml_buffer = NULL;
ompi_request_t **reqs = NULL;
rank = ompi_comm_rank(comm);
rsize = ompi_comm_remote_size(comm);
/* determine result of the remote group, you cannot
* use coll_reduce for inter-communicators, since than
* you would need to determine an order between the
* two groups (e.g. which group is providing the data
* and which one enters coll_reduce with providing
* MPI_PROC_NULL as root argument etc.) Here,
* we execute the data exchange for both groups
* simultaneously. */
/*****************************************************************/
if (rank == root) {
err = ompi_datatype_type_extent(dtype, &extent);
if (OMPI_SUCCESS != err) {
return OMPI_ERROR;
}
dsize = opal_datatype_span(&dtype->super, count, &gap);
tmpbuf = (char *) malloc(dsize);
if (NULL == tmpbuf) { err = OMPI_ERR_OUT_OF_RESOURCE; line = __LINE__; goto exit; }
pml_buffer = tmpbuf - gap;
if (rsize > 1) {
reqs = ompi_coll_base_comm_get_reqs(module->base_data, rsize - 1);
if( NULL == reqs ) { err = OMPI_ERR_OUT_OF_RESOURCE; line = __LINE__; goto exit; }
}
/* Do a send-recv between the two root procs. to avoid deadlock */
err = ompi_coll_base_sendrecv_actual(sbuf, count, dtype, 0,
MCA_COLL_BASE_TAG_ALLREDUCE,
rbuf, count, dtype, 0,
MCA_COLL_BASE_TAG_ALLREDUCE,
comm, MPI_STATUS_IGNORE);
if (OMPI_SUCCESS != err) { line = __LINE__; goto exit; }
/* Loop receiving and calling reduction function (C or Fortran). */
for (i = 1; i < rsize; i++) {
err = MCA_PML_CALL(recv(pml_buffer, count, dtype, i,
MCA_COLL_BASE_TAG_ALLREDUCE, comm,
MPI_STATUS_IGNORE));
if (OMPI_SUCCESS != err) { line = __LINE__; goto exit; }
/* Perform the reduction */
ompi_op_reduce(op, pml_buffer, rbuf, count, dtype);
}
} else {
/* If not root, send data to the root. */
err = MCA_PML_CALL(send(sbuf, count, dtype, root,
MCA_COLL_BASE_TAG_ALLREDUCE,
MCA_PML_BASE_SEND_STANDARD, comm));
if (OMPI_SUCCESS != err) { line = __LINE__; goto exit; }
}
/* now we have on one process the result of the remote group. To distribute
* the data to all processes in the local group, we exchange the data between
* the two root processes. They then send it to every other process in the
* remote group. */
/***************************************************************************/
if (rank == root) {
/* sendrecv between the two roots */
err = ompi_coll_base_sendrecv_actual(rbuf, count, dtype, 0,
MCA_COLL_BASE_TAG_ALLREDUCE,
pml_buffer, count, dtype, 0,
MCA_COLL_BASE_TAG_ALLREDUCE,
comm, MPI_STATUS_IGNORE);
if (OMPI_SUCCESS != err) { line = __LINE__; goto exit; }
/* distribute the data to other processes in remote group.
* Note that we start from 1 (not from zero), since zero
* has already the correct data AND we avoid a potential
* deadlock here.
*/
if (rsize > 1) {
for (i = 1; i < rsize; i++) {
err = MCA_PML_CALL(isend(pml_buffer, count, dtype, i,
MCA_COLL_BASE_TAG_ALLREDUCE,
MCA_PML_BASE_SEND_STANDARD, comm,
&reqs[i - 1]));
if (OMPI_SUCCESS != err) { line = __LINE__; goto exit; }
}
err =
ompi_request_wait_all(rsize - 1, reqs,
MPI_STATUSES_IGNORE);
if (OMPI_SUCCESS != err) { line = __LINE__; goto exit; }
}
} else {
err = MCA_PML_CALL(recv(rbuf, count, dtype, root,
MCA_COLL_BASE_TAG_ALLREDUCE,
comm, MPI_STATUS_IGNORE));
if (OMPI_SUCCESS != err) { line = __LINE__; goto exit; }
}
exit:
if( MPI_SUCCESS != err ) {
OPAL_OUTPUT((ompi_coll_base_framework.framework_output,"%s:%4d\tError occurred %d, rank %2d", __FILE__,
line, err, rank));
(void)line; // silence compiler warning
ompi_coll_base_free_reqs(reqs, rsize - 1);
}
if (NULL != tmpbuf) {
free(tmpbuf);
}
return err;
}
|
