1 /* smpi_coll.c -- various optimized routing for collectives */
3 /* Copyright (c) 2009-2015. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
14 #include "colls/colls.h"
15 #include "simgrid/sg_config.h"
17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_coll, smpi, "Logging specific to SMPI (coll)");
19 s_mpi_coll_description_t mpi_coll_gather_description[] = {
20 {"default", "gather default collective", (void*)smpi_mpi_gather},
21 COLL_GATHERS(COLL_DESCRIPTION, COLL_COMMA), {NULL, NULL, NULL} /* this array must be NULL terminated */
25 s_mpi_coll_description_t mpi_coll_allgather_description[] = {
27 "allgather default collective",
28 (void*)smpi_mpi_allgather},
29 COLL_ALLGATHERS(COLL_DESCRIPTION, COLL_COMMA),
30 {NULL, NULL, NULL} /* this array must be NULL terminated */
33 s_mpi_coll_description_t mpi_coll_allgatherv_description[] = {
35 "allgatherv default collective",
36 (void*)smpi_mpi_allgatherv},
37 COLL_ALLGATHERVS(COLL_DESCRIPTION, COLL_COMMA),
38 {NULL, NULL, NULL} /* this array must be NULL terminated */
41 s_mpi_coll_description_t mpi_coll_allreduce_description[] = {
43 "allreduce default collective",
44 (void*)smpi_mpi_allreduce},
45 COLL_ALLREDUCES(COLL_DESCRIPTION, COLL_COMMA),
46 {NULL, NULL, NULL} /* this array must be NULL terminated */
49 s_mpi_coll_description_t mpi_coll_reduce_scatter_description[] = {
51 "reduce_scatter default collective",
52 (void*)smpi_mpi_reduce_scatter},
53 COLL_REDUCE_SCATTERS(COLL_DESCRIPTION, COLL_COMMA),
54 {NULL, NULL, NULL} /* this array must be NULL terminated */
57 s_mpi_coll_description_t mpi_coll_scatter_description[] = {
59 "scatter default collective",
60 (void*)smpi_mpi_scatter},
61 COLL_SCATTERS(COLL_DESCRIPTION, COLL_COMMA),
62 {NULL, NULL, NULL} /* this array must be NULL terminated */
65 s_mpi_coll_description_t mpi_coll_barrier_description[] = {
67 "barrier default collective",
68 (void*)smpi_mpi_barrier},
69 COLL_BARRIERS(COLL_DESCRIPTION, COLL_COMMA),
70 {NULL, NULL, NULL} /* this array must be NULL terminated */
72 s_mpi_coll_description_t mpi_coll_alltoall_description[] = {
74 "Ompi alltoall default collective",
75 (void*)smpi_coll_tuned_alltoall_ompi2},
76 COLL_ALLTOALLS(COLL_DESCRIPTION, COLL_COMMA),
78 "Alltoall Bruck (SG) collective",
79 (void*)smpi_coll_tuned_alltoall_bruck},
81 "Alltoall basic linear (SG) collective",
82 (void*)smpi_coll_tuned_alltoall_basic_linear},
83 {NULL, NULL, NULL} /* this array must be NULL terminated */
86 s_mpi_coll_description_t mpi_coll_alltoallv_description[] = {
88 "Ompi alltoallv default collective",
89 (void*)smpi_coll_basic_alltoallv},
90 COLL_ALLTOALLVS(COLL_DESCRIPTION, COLL_COMMA),
91 {NULL, NULL, NULL} /* this array must be NULL terminated */
94 s_mpi_coll_description_t mpi_coll_bcast_description[] = {
96 "bcast default collective ",
97 (void*)smpi_mpi_bcast},
98 COLL_BCASTS(COLL_DESCRIPTION, COLL_COMMA),
99 {NULL, NULL, NULL} /* this array must be NULL terminated */
102 s_mpi_coll_description_t mpi_coll_reduce_description[] = {
104 "reduce default collective",
105 (void*)smpi_mpi_reduce},
106 COLL_REDUCES(COLL_DESCRIPTION, COLL_COMMA),
107 {NULL, NULL, NULL} /* this array must be NULL terminated */
112 /** Displays the long description of all registered models, and quit */
113 void coll_help(const char *category, s_mpi_coll_description_t * table)
116 printf("Long description of the %s models accepted by this simulator:\n",
118 for (i = 0; table[i].name; i++)
119 printf(" %s: %s\n", table[i].name, table[i].description);
122 int find_coll_description(s_mpi_coll_description_t * table,
123 char *name, const char *desc)
126 char *name_list = NULL;
128 if(name==NULL){//no argument provided, use active selector's algorithm
129 name=(char*)sg_cfg_get_string("smpi/coll_selector");
132 for (i = 0; table[i].name; i++)
133 if (!strcmp(name, table[i].name)) {
134 if (strcmp(table[i].name,"default"))
135 XBT_INFO("Switch to algorithm %s for collective %s",table[i].name,desc);
140 // collective seems not handled by the active selector, try with default one
141 name=(char*)"default";
142 for (i = 0; table[i].name; i++)
143 if (!strcmp(name, table[i].name)) {
148 xbt_die("No collective is valid for '%s'! This is a bug.",name);
149 name_list = xbt_strdup(table[0].name);
150 for (i = 1; table[i].name; i++) {
151 name_list = static_cast<char*>(xbt_realloc(name_list,
152 strlen(name_list) + strlen(table[i].name) + 3));
153 strcat(name_list, ", ");
154 strcat(name_list, table[i].name);
156 xbt_die("Collective '%s' is invalid! Valid collectives are: %s.", name, name_list);
160 int (*mpi_coll_gather_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, int root, MPI_Comm);
161 int (*mpi_coll_allgather_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, MPI_Comm);
162 int (*mpi_coll_allgatherv_fun)(void *, int, MPI_Datatype, void*, int*, int*, MPI_Datatype, MPI_Comm);
163 int (*mpi_coll_allreduce_fun)(void *sbuf, void *rbuf, int rcount, MPI_Datatype dtype, MPI_Op op, MPI_Comm comm);
164 int (*mpi_coll_alltoall_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, MPI_Comm);
165 int (*mpi_coll_alltoallv_fun)(void *, int*, int*, MPI_Datatype, void*, int*, int*, MPI_Datatype, MPI_Comm);
166 int (*mpi_coll_bcast_fun)(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm com);
167 int (*mpi_coll_reduce_fun)(void *buf, void *rbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm);
168 int (*mpi_coll_reduce_scatter_fun)(void *sbuf, void *rbuf, int *rcounts,MPI_Datatype dtype,MPI_Op op,MPI_Comm comm);
169 int (*mpi_coll_scatter_fun)(void *sendbuf, int sendcount, MPI_Datatype sendtype,void *recvbuf, int recvcount, MPI_Datatype recvtype,int root, MPI_Comm comm);
170 int (*mpi_coll_barrier_fun)(MPI_Comm comm);
173 int smpi_coll_tuned_alltoall_ompi2(void *sendbuf, int sendcount,
174 MPI_Datatype sendtype, void *recvbuf,
175 int recvcount, MPI_Datatype recvtype,
179 size = smpi_comm_size(comm);
180 sendsize = smpi_datatype_size(sendtype) * sendcount;
181 if (sendsize < 200 && size > 12) {
183 smpi_coll_tuned_alltoall_bruck(sendbuf, sendcount, sendtype,
184 recvbuf, recvcount, recvtype,
186 } else if (sendsize < 3000) {
188 smpi_coll_tuned_alltoall_basic_linear(sendbuf, sendcount,
190 recvcount, recvtype, comm);
193 smpi_coll_tuned_alltoall_ring(sendbuf, sendcount, sendtype,
194 recvbuf, recvcount, recvtype,
202 * Openmpi calls this routine when the message size sent to each rank < 2000 bytes and size < 12
203 * FIXME: uh, check smpi_pmpi again, but this routine is called for > 12, not
206 int smpi_coll_tuned_alltoall_bruck(void *sendbuf, int sendcount,
207 MPI_Datatype sendtype, void *recvbuf,
208 int recvcount, MPI_Datatype recvtype,
211 int system_tag = 777;
212 int i, rank, size, err, count;
214 MPI_Aint sendext = 0;
215 MPI_Aint recvext = 0;
216 MPI_Request *requests;
218 // FIXME: check implementation
219 rank = smpi_comm_rank(comm);
220 size = smpi_comm_size(comm);
221 XBT_DEBUG("<%d> algorithm alltoall_bruck() called.", rank);
222 smpi_datatype_extent(sendtype, &lb, &sendext);
223 smpi_datatype_extent(recvtype, &lb, &recvext);
224 /* Local copy from self */
226 smpi_datatype_copy((char *)sendbuf + rank * sendcount * sendext,
228 (char *)recvbuf + rank * recvcount * recvext,
229 recvcount, recvtype);
230 if (err == MPI_SUCCESS && size > 1) {
231 /* Initiate all send/recv to/from others. */
232 requests = xbt_new(MPI_Request, 2 * (size - 1));
234 /* Create all receives that will be posted first */
235 for (i = 0; i < size; ++i) {
237 XBT_DEBUG("<%d> skip request creation [src = %d, recvcount = %d]",
242 smpi_irecv_init((char *)recvbuf + i * recvcount * recvext, recvcount,
243 recvtype, i, system_tag, comm);
246 /* Now create all sends */
247 for (i = 0; i < size; ++i) {
249 XBT_DEBUG("<%d> skip request creation [dst = %d, sendcount = %d]",
254 smpi_isend_init((char *)sendbuf + i * sendcount * sendext, sendcount,
255 sendtype, i, system_tag, comm);
258 /* Wait for them all. */
259 smpi_mpi_startall(count, requests);
260 XBT_DEBUG("<%d> wait for %d requests", rank, count);
261 smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE);
262 for(i = 0; i < count; i++) {
263 if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);
271 * Alltoall basic_linear (STARMPI:alltoall-simple)
273 int smpi_coll_tuned_alltoall_basic_linear(void *sendbuf, int sendcount,
274 MPI_Datatype sendtype,
275 void *recvbuf, int recvcount,
276 MPI_Datatype recvtype,
279 int system_tag = 888;
280 int i, rank, size, err, count;
281 MPI_Aint lb = 0, sendext = 0, recvext = 0;
282 MPI_Request *requests;
285 rank = smpi_comm_rank(comm);
286 size = smpi_comm_size(comm);
287 XBT_DEBUG("<%d> algorithm alltoall_basic_linear() called.", rank);
288 smpi_datatype_extent(sendtype, &lb, &sendext);
289 smpi_datatype_extent(recvtype, &lb, &recvext);
290 /* simple optimization */
291 err = smpi_datatype_copy((char *)sendbuf + rank * sendcount * sendext,
293 (char *)recvbuf + rank * recvcount * recvext,
294 recvcount, recvtype);
295 if (err == MPI_SUCCESS && size > 1) {
296 /* Initiate all send/recv to/from others. */
297 requests = xbt_new(MPI_Request, 2 * (size - 1));
298 /* Post all receives first -- a simple optimization */
300 for (i = (rank + 1) % size; i != rank; i = (i + 1) % size) {
302 smpi_irecv_init((char *)recvbuf + i * recvcount * recvext, recvcount,
303 recvtype, i, system_tag, comm);
306 /* Now post all sends in reverse order
307 * - We would like to minimize the search time through message queue
308 * when messages actually arrive in the order in which they were posted.
309 * TODO: check the previous assertion
311 for (i = (rank + size - 1) % size; i != rank; i = (i + size - 1) % size) {
313 smpi_isend_init((char *)sendbuf + i * sendcount * sendext, sendcount,
314 sendtype, i, system_tag, comm);
317 /* Wait for them all. */
318 smpi_mpi_startall(count, requests);
319 XBT_DEBUG("<%d> wait for %d requests", rank, count);
320 smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE);
321 for(i = 0; i < count; i++) {
322 if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);
329 int smpi_coll_basic_alltoallv(void *sendbuf, int *sendcounts,
330 int *senddisps, MPI_Datatype sendtype,
331 void *recvbuf, int *recvcounts,
332 int *recvdisps, MPI_Datatype recvtype,
335 int system_tag = 889;
336 int i, rank, size, err, count;
337 MPI_Aint lb = 0, sendext = 0, recvext = 0;
338 MPI_Request *requests;
341 rank = smpi_comm_rank(comm);
342 size = smpi_comm_size(comm);
343 XBT_DEBUG("<%d> algorithm basic_alltoallv() called.", rank);
344 smpi_datatype_extent(sendtype, &lb, &sendext);
345 smpi_datatype_extent(recvtype, &lb, &recvext);
346 /* Local copy from self */
348 smpi_datatype_copy((char *)sendbuf + senddisps[rank] * sendext,
349 sendcounts[rank], sendtype,
350 (char *)recvbuf + recvdisps[rank] * recvext,
351 recvcounts[rank], recvtype);
352 if (err == MPI_SUCCESS && size > 1) {
353 /* Initiate all send/recv to/from others. */
354 requests = xbt_new(MPI_Request, 2 * (size - 1));
356 /* Create all receives that will be posted first */
357 for (i = 0; i < size; ++i) {
358 if (i == rank || recvcounts[i] == 0) {
360 ("<%d> skip request creation [src = %d, recvcounts[src] = %d]",
361 rank, i, recvcounts[i]);
365 smpi_irecv_init((char *)recvbuf + recvdisps[i] * recvext,
366 recvcounts[i], recvtype, i, system_tag, comm);
369 /* Now create all sends */
370 for (i = 0; i < size; ++i) {
371 if (i == rank || sendcounts[i] == 0) {
373 ("<%d> skip request creation [dst = %d, sendcounts[dst] = %d]",
374 rank, i, sendcounts[i]);
378 smpi_isend_init((char *)sendbuf + senddisps[i] * sendext,
379 sendcounts[i], sendtype, i, system_tag, comm);
382 /* Wait for them all. */
383 smpi_mpi_startall(count, requests);
384 XBT_DEBUG("<%d> wait for %d requests", rank, count);
385 smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE);
386 for(i = 0; i < count; i++) {
387 if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);