-
Notifications
You must be signed in to change notification settings - Fork 18
/
congestors.c
279 lines (226 loc) · 10.1 KB
/
congestors.c
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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
/*
* The entirety of this work is licensed under the Apache License,
* Version 2.0 (the "License"); you may not use this file except
* in compliance with the License.
*
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <network_test.h>
#include <math.h>
#define BILL 1000000000L
int p2p_incast_congestor(CommConfig_t *config, MPI_Comm comm, int myrank, int comm_ranks)
{
int i;
MPI_Request *request_list = NULL;
request_list = malloc(sizeof(MPI_Request) * comm_ranks);
if (request_list == NULL) {
die("Failed to allocate request_list in p2p_incast_congestor()\n");
}
if(myrank == 0) {
for(i=1; i < comm_ranks; i++) {
mpi_error(MPI_Irecv(&config->a2a_rbuffer[i * config->incast_cnt], config->incast_cnt,
MPI_DOUBLE, i, 987, comm, &request_list[i-1]));
}
mpi_error(MPI_Waitall(comm_ranks-1, request_list, MPI_STATUS_IGNORE));
} else {
mpi_error(MPI_Send(config->a2a_sbuffer, config->incast_cnt, MPI_DOUBLE, 0, 987, comm));
}
free(request_list);
return 0;
}
int p2p_bcast_congestor(CommConfig_t *config, MPI_Comm comm, int myrank, int comm_ranks)
{
int i;
MPI_Request *request_list = NULL;
request_list = malloc(sizeof(MPI_Request) * comm_ranks);
if (request_list == NULL) {
die("Failed to allocate request_list in p2p_bcast_congestor()\n");
}
if(myrank == 0) {
for(i=1; i < comm_ranks; i++) {
mpi_error(MPI_Isend(config->p2p_buffer, config->bcast_cnt, MPI_DOUBLE, i, 987, comm, &request_list[i-1]));
}
mpi_error(MPI_Waitall(comm_ranks-1, request_list, MPI_STATUS_IGNORE));
} else {
mpi_error(MPI_Recv(config->p2p_buffer, config->bcast_cnt, MPI_DOUBLE, 0, 987, comm, MPI_STATUS_IGNORE));
}
free(request_list);
return 0;
}
int a2a_congestor(CommConfig_t *config, MPI_Comm comm, int myrank, int comm_ranks)
{
int i, pof2, src, dst;
i = 1;
/* comm_size a power-of-two? */
while (i < comm_ranks)
i *= 2;
if (i == comm_ranks)
pof2 = 1;
else
pof2 = 0;
/* do the pairwise exchanges */
for(i = 0; i < comm_ranks; i++) {
if (pof2 == 1) {
/* use exclusive-or algorithm */
src = dst = myrank ^ i;
} else {
src = (myrank - i + comm_ranks) % comm_ranks;
dst = (myrank + i) % comm_ranks;
}
mpi_error(MPI_Sendrecv(&config->a2a_sbuffer[i * config->a2a_cnt], config->a2a_cnt, MPI_DOUBLE,
dst, 987, &config->a2a_rbuffer[i * config->a2a_cnt], config->a2a_cnt, MPI_DOUBLE,
src, 987, comm, MPI_STATUS_IGNORE));
}
return 0;
}
int allreduce_congestor(CommConfig_t *config, MPI_Comm comm, int myrank, int comm_ranks)
{
mpi_error(MPI_Allreduce(config->ar_sbuffer, config->ar_rbuffer, config->ar_cnt,
MPI_DOUBLE, MPI_SUM, comm));
return 0;
}
int rma_incast_congestor(CommConfig_t *config, MPI_Comm comm, int myrank, int comm_ranks)
{
if (myrank != 0) {
mpi_error(MPI_Put(&config->rma_a2a_buffer[0], config->incast_cnt, MPI_DOUBLE, 0,
(MPI_Aint)(myrank * config->incast_cnt), config->incast_cnt, MPI_DOUBLE, config->rma_a2a_window));
mpi_error(MPI_Win_flush(0, config->rma_a2a_window));
}
return 0;
}
int rma_bcast_congestor(CommConfig_t *config, MPI_Comm comm, int myrank, int comm_ranks)
{
if (myrank != 0) {
mpi_error(MPI_Get(&config->rma_buffer[0], config->bcast_cnt, MPI_DOUBLE, 0, 0,
config->bcast_cnt, MPI_DOUBLE, config->rma_window));
mpi_error(MPI_Win_flush(0, config->rma_window));
}
return 0;
}
int congestor(CommConfig_t *config, int n_measurements, int niters, MPI_Comm test_comm, CommTest_t req_test,
int record_perf, double * perfvals, double * perfval, int *real_n_measurements)
{
int i, m, test_myrank, test_nranks;
double bt1, bt2, bt;
struct timespec t1, t2;
MPI_Request req;
double timeout_t1, timeout;
mpi_error(MPI_Comm_rank(test_comm, &test_myrank));
mpi_error(MPI_Comm_size(test_comm, &test_nranks));
if (req_test == RMA_INCAST_CONGESTOR) {
mpi_error(MPI_Win_lock(MPI_LOCK_SHARED, 0, 0, config->rma_a2a_window));
} else if (req_test == RMA_BCAST_CONGESTOR) {
mpi_error(MPI_Win_lock(MPI_LOCK_SHARED, 0, 0, config->rma_window));
}
timeout_t1 = MPI_Wtime();
timeout = 0.;
mpi_error(MPI_Iallreduce(MPI_IN_PLACE, &timeout, 1, MPI_DOUBLE, MPI_MAX, test_comm, &req));
if (record_perf) *real_n_measurements = 0;
bt = 0.;
for (m = 0; m < n_measurements; m++) {
/* check if we need to timeout this test because it is running too long */
mpi_error(MPI_Wait(&req, MPI_STATUS_IGNORE));
if (TEST_TIMEOUT_SECS <= timeout) continue;
timeout = MPI_Wtime() - timeout_t1;
mpi_error(MPI_Iallreduce(MPI_IN_PLACE, &timeout, 1, MPI_DOUBLE, MPI_MAX, test_comm, &req));
if (record_perf) mpi_error(MPI_Barrier(test_comm));
for (i = -1; i < niters; i++) {
if (i == 0) bt1 = MPI_Wtime();
if (i >= 0) clock_gettime(CLOCK_MONOTONIC, &t1);
switch (req_test) {
case A2A_CONGESTOR:
a2a_congestor(config, test_comm, test_myrank, test_nranks);
break;
case ALLREDUCE_CONGESTOR:
allreduce_congestor(config, test_comm, test_myrank, test_nranks);
break;
case P2P_INCAST_CONGESTOR:
p2p_incast_congestor(config, test_comm, test_myrank, test_nranks);
break;
case RMA_INCAST_CONGESTOR:
rma_incast_congestor(config, test_comm, test_myrank, test_nranks);
break;
case P2P_BCAST_CONGESTOR:
p2p_bcast_congestor(config, test_comm, test_myrank, test_nranks);
break;
case RMA_BCAST_CONGESTOR:
rma_bcast_congestor(config, test_comm, test_myrank, test_nranks);
break;
default:
break;
}
if (i >= 0 && record_perf) {
clock_gettime(CLOCK_MONOTONIC, &t2);
perfvals[m*niters + i] = 1e-9 * (double)(BILL * (t2.tv_sec - t1.tv_sec) + (t2.tv_nsec - t1.tv_nsec));
}
}
bt2 = MPI_Wtime();
bt += bt2 - bt1;
if (record_perf) (*real_n_measurements)++;
}
if (req != MPI_REQUEST_NULL) {
mpi_error(MPI_Wait(&req, MPI_STATUS_IGNORE));
}
if (record_perf) {
if (req_test == A2A_CONGESTOR) {
/* we report uni-directional BW in MiB/s/rank */
for (i = 0; i < *real_n_measurements*niters; i++) {
perfvals[i] = (double)(sizeof(double) * config->a2a_cnt * (test_nranks-1)) / (perfvals[i] * 1024. * 1024.);
}
perfval[0] = (double)(sizeof(double) * config->a2a_cnt * *real_n_measurements*niters *
(test_nranks-1)) / (bt * 1024. * 1024.);
} else if (req_test == ALLREDUCE_CONGESTOR) {
/* we report uni-directional BW in MiB/s/rank. we assume an algorithm,
like recursive halving/recursive doubling, that has each rank send 2X the msglen in the limit
of large N_ranks.
*/
for (i = 0; i < *real_n_measurements*niters; i++) {
perfvals[i] = (double)(sizeof(double) * config->ar_cnt * 2.) / (perfvals[i] * 1024. * 1024.);
}
perfval[0] = (double)(sizeof(double) * config->ar_cnt * *real_n_measurements*niters * 2.) /
(bt * 1024. * 1024.);
} else if (req_test == P2P_INCAST_CONGESTOR || req_test == RMA_INCAST_CONGESTOR) {
/* we report uni-directional BW in MiB/s/rank */
if (test_myrank == 0) {
for (i = 0; i < *real_n_measurements*niters; i++) {
perfvals[i] = -1.0;
}
perfval[0] = -1.0;
} else {
for (i = 0; i < *real_n_measurements*niters; i++) {
perfvals[i] = (double)(sizeof(double) * config->incast_cnt) / (perfvals[i] * 1024. * 1024.);
}
perfval[0] = (double)(sizeof(double) * config->incast_cnt * *real_n_measurements*niters) /
(bt * 1024. * 1024.);
}
} else if (req_test == P2P_BCAST_CONGESTOR || req_test == RMA_BCAST_CONGESTOR) {
/* we report uni-directional BW in MiB/s/rank */
if (test_myrank == 0) {
for (i = 0; i < *real_n_measurements*niters; i++) {
perfvals[i] = -1.0;
}
perfval[0] = -1.0;
} else {
for (i = 0; i < *real_n_measurements*niters; i++) {
perfvals[i] = (double)(sizeof(double) * config->bcast_cnt) / (perfvals[i] * 1024. * 1024.);
}
perfval[0] = (double)(sizeof(double) * config->bcast_cnt * *real_n_measurements*niters) /
(bt * 1024. * 1024.);
}
}
}
if (req_test == RMA_INCAST_CONGESTOR) {
mpi_error(MPI_Win_unlock(0, config->rma_a2a_window));
} else if (req_test == RMA_BCAST_CONGESTOR) {
mpi_error(MPI_Win_unlock(0, config->rma_window));
}
return 0;
}