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)
125 char *name_list = NULL;
127 if(name==NULL){//no argument provided, use active selector's algorithm
128 name=(char*)sg_cfg_get_string("smpi/coll_selector");
131 for (int i = 0; table[i].name; i++)
132 if (!strcmp(name, table[i].name)) {
133 if (strcmp(table[i].name,"default"))
134 XBT_INFO("Switch to algorithm %s for collective %s",table[i].name,desc);
139 // collective seems not handled by the active selector, try with default one
140 name=(char*)"default";
141 for (int i = 0; table[i].name; i++)
142 if (!strcmp(name, table[i].name)) {
147 xbt_die("No collective is valid for '%s'! This is a bug.",name);
148 name_list = xbt_strdup(table[0].name);
149 for (int i = 1; table[i].name; i++) {
150 name_list = static_cast<char*>(xbt_realloc(name_list,
151 strlen(name_list) + strlen(table[i].name) + 3));
152 strcat(name_list, ", ");
153 strcat(name_list, table[i].name);
155 xbt_die("Collective '%s' is invalid! Valid collectives are: %s.", name, name_list);
159 int (*mpi_coll_gather_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, int root, MPI_Comm);
160 int (*mpi_coll_allgather_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, MPI_Comm);
161 int (*mpi_coll_allgatherv_fun)(void *, int, MPI_Datatype, void*, int*, int*, MPI_Datatype, MPI_Comm);
162 int (*mpi_coll_allreduce_fun)(void *sbuf, void *rbuf, int rcount, MPI_Datatype dtype, MPI_Op op, MPI_Comm comm);
163 int (*mpi_coll_alltoall_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, MPI_Comm);
164 int (*mpi_coll_alltoallv_fun)(void *, int*, int*, MPI_Datatype, void*, int*, int*, MPI_Datatype, MPI_Comm);
165 int (*mpi_coll_bcast_fun)(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm com);
166 int (*mpi_coll_reduce_fun)(void *buf, void *rbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm);
167 int (*mpi_coll_reduce_scatter_fun)(void *sbuf, void *rbuf, int *rcounts,MPI_Datatype dtype,MPI_Op op,MPI_Comm comm);
168 int (*mpi_coll_scatter_fun)(void *sendbuf, int sendcount, MPI_Datatype sendtype,void *recvbuf, int recvcount, MPI_Datatype recvtype,int root, MPI_Comm comm);
169 int (*mpi_coll_barrier_fun)(MPI_Comm comm);
172 int smpi_coll_tuned_alltoall_ompi2(void *sendbuf, int sendcount,
173 MPI_Datatype sendtype, void *recvbuf,
174 int recvcount, MPI_Datatype recvtype,
178 size = smpi_comm_size(comm);
179 sendsize = smpi_datatype_size(sendtype) * sendcount;
180 if (sendsize < 200 && size > 12) {
182 smpi_coll_tuned_alltoall_bruck(sendbuf, sendcount, sendtype,
183 recvbuf, recvcount, recvtype,
185 } else if (sendsize < 3000) {
187 smpi_coll_tuned_alltoall_basic_linear(sendbuf, sendcount,
189 recvcount, recvtype, comm);
192 smpi_coll_tuned_alltoall_ring(sendbuf, sendcount, sendtype,
193 recvbuf, recvcount, recvtype,
201 * Openmpi calls this routine when the message size sent to each rank < 2000 bytes and size < 12
202 * FIXME: uh, check smpi_pmpi again, but this routine is called for > 12, not
205 int smpi_coll_tuned_alltoall_bruck(void *sendbuf, int sendcount,
206 MPI_Datatype sendtype, void *recvbuf,
207 int recvcount, MPI_Datatype recvtype,
210 int system_tag = 777;
211 int i, rank, size, err, count;
213 MPI_Aint sendext = 0;
214 MPI_Aint recvext = 0;
215 MPI_Request *requests;
217 // FIXME: check implementation
218 rank = smpi_comm_rank(comm);
219 size = smpi_comm_size(comm);
220 XBT_DEBUG("<%d> algorithm alltoall_bruck() called.", rank);
221 smpi_datatype_extent(sendtype, &lb, &sendext);
222 smpi_datatype_extent(recvtype, &lb, &recvext);
223 /* Local copy from self */
225 smpi_datatype_copy((char *)sendbuf + rank * sendcount * sendext,
227 (char *)recvbuf + rank * recvcount * recvext,
228 recvcount, recvtype);
229 if (err == MPI_SUCCESS && size > 1) {
230 /* Initiate all send/recv to/from others. */
231 requests = xbt_new(MPI_Request, 2 * (size - 1));
233 /* Create all receives that will be posted first */
234 for (i = 0; i < size; ++i) {
236 XBT_DEBUG("<%d> skip request creation [src = %d, recvcount = %d]",
241 smpi_irecv_init((char *)recvbuf + i * recvcount * recvext, recvcount,
242 recvtype, i, system_tag, comm);
245 /* Now create all sends */
246 for (i = 0; i < size; ++i) {
248 XBT_DEBUG("<%d> skip request creation [dst = %d, sendcount = %d]",
253 smpi_isend_init((char *)sendbuf + i * sendcount * sendext, sendcount,
254 sendtype, i, system_tag, comm);
257 /* Wait for them all. */
258 smpi_mpi_startall(count, requests);
259 XBT_DEBUG("<%d> wait for %d requests", rank, count);
260 smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE);
261 for(i = 0; i < count; i++) {
262 if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);
270 * Alltoall basic_linear (STARMPI:alltoall-simple)
272 int smpi_coll_tuned_alltoall_basic_linear(void *sendbuf, int sendcount,
273 MPI_Datatype sendtype,
274 void *recvbuf, int recvcount,
275 MPI_Datatype recvtype,
278 int system_tag = 888;
279 int i, rank, size, err, count;
280 MPI_Aint lb = 0, sendext = 0, recvext = 0;
281 MPI_Request *requests;
284 rank = smpi_comm_rank(comm);
285 size = smpi_comm_size(comm);
286 XBT_DEBUG("<%d> algorithm alltoall_basic_linear() called.", rank);
287 smpi_datatype_extent(sendtype, &lb, &sendext);
288 smpi_datatype_extent(recvtype, &lb, &recvext);
289 /* simple optimization */
290 err = smpi_datatype_copy((char *)sendbuf + rank * sendcount * sendext,
292 (char *)recvbuf + rank * recvcount * recvext,
293 recvcount, recvtype);
294 if (err == MPI_SUCCESS && size > 1) {
295 /* Initiate all send/recv to/from others. */
296 requests = xbt_new(MPI_Request, 2 * (size - 1));
297 /* Post all receives first -- a simple optimization */
299 for (i = (rank + 1) % size; i != rank; i = (i + 1) % size) {
301 smpi_irecv_init((char *)recvbuf + i * recvcount * recvext, recvcount,
302 recvtype, i, system_tag, comm);
305 /* Now post all sends in reverse order
306 * - We would like to minimize the search time through message queue
307 * when messages actually arrive in the order in which they were posted.
308 * TODO: check the previous assertion
310 for (i = (rank + size - 1) % size; i != rank; i = (i + size - 1) % size) {
312 smpi_isend_init((char *)sendbuf + i * sendcount * sendext, sendcount,
313 sendtype, i, system_tag, comm);
316 /* Wait for them all. */
317 smpi_mpi_startall(count, requests);
318 XBT_DEBUG("<%d> wait for %d requests", rank, count);
319 smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE);
320 for(i = 0; i < count; i++) {
321 if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);
328 int smpi_coll_basic_alltoallv(void *sendbuf, int *sendcounts,
329 int *senddisps, MPI_Datatype sendtype,
330 void *recvbuf, int *recvcounts,
331 int *recvdisps, MPI_Datatype recvtype,
334 int system_tag = 889;
335 int i, rank, size, err, count;
336 MPI_Aint lb = 0, sendext = 0, recvext = 0;
337 MPI_Request *requests;
340 rank = smpi_comm_rank(comm);
341 size = smpi_comm_size(comm);
342 XBT_DEBUG("<%d> algorithm basic_alltoallv() called.", rank);
343 smpi_datatype_extent(sendtype, &lb, &sendext);
344 smpi_datatype_extent(recvtype, &lb, &recvext);
345 /* Local copy from self */
347 smpi_datatype_copy((char *)sendbuf + senddisps[rank] * sendext,
348 sendcounts[rank], sendtype,
349 (char *)recvbuf + recvdisps[rank] * recvext,
350 recvcounts[rank], recvtype);
351 if (err == MPI_SUCCESS && size > 1) {
352 /* Initiate all send/recv to/from others. */
353 requests = xbt_new(MPI_Request, 2 * (size - 1));
355 /* Create all receives that will be posted first */
356 for (i = 0; i < size; ++i) {
357 if (i == rank || recvcounts[i] == 0) {
359 ("<%d> skip request creation [src = %d, recvcounts[src] = %d]",
360 rank, i, recvcounts[i]);
364 smpi_irecv_init((char *)recvbuf + recvdisps[i] * recvext,
365 recvcounts[i], recvtype, i, system_tag, comm);
368 /* Now create all sends */
369 for (i = 0; i < size; ++i) {
370 if (i == rank || sendcounts[i] == 0) {
372 ("<%d> skip request creation [dst = %d, sendcounts[dst] = %d]",
373 rank, i, sendcounts[i]);
377 smpi_isend_init((char *)sendbuf + senddisps[i] * sendext,
378 sendcounts[i], sendtype, i, system_tag, comm);
381 /* Wait for them all. */
382 smpi_mpi_startall(count, requests);
383 XBT_DEBUG("<%d> wait for %d requests", rank, count);
384 smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE);
385 for(i = 0; i < count; i++) {
386 if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);