1 /* selector with default/naive Simgrid algorithms. These should not be trusted for performance evaluations */
3 /* Copyright (c) 2009-2019. The SimGrid Team. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "colls_private.hpp"
9 #include "src/smpi/include/smpi_actor.hpp"
14 int Coll_bcast_default::bcast(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm comm)
16 return Coll_bcast_binomial_tree::bcast(buf, count, datatype, root, comm);
19 int Coll_barrier_default::barrier(MPI_Comm comm)
21 return Coll_barrier_ompi_basic_linear::barrier(comm);
25 int Coll_gather_default::gather(void *sendbuf, int sendcount, MPI_Datatype sendtype,
26 void *recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm)
28 const int system_tag = COLL_TAG_GATHER;
32 int rank = comm->rank();
33 int size = comm->size();
35 // Send buffer to root
36 Request::send(sendbuf, sendcount, sendtype, root, system_tag, comm);
38 recvtype->extent(&lb, &recvext);
39 // Local copy from root
40 Datatype::copy(sendbuf, sendcount, sendtype, static_cast<char*>(recvbuf) + root * recvcount * recvext,
42 // Receive buffers from senders
43 MPI_Request *requests = xbt_new(MPI_Request, size - 1);
45 for (int src = 0; src < size; src++) {
47 requests[index] = Request::irecv_init(static_cast<char*>(recvbuf) + src * recvcount * recvext, recvcount, recvtype,
48 src, system_tag, comm);
52 // Wait for completion of irecv's.
53 Request::startall(size - 1, requests);
54 Request::waitall(size - 1, requests, MPI_STATUS_IGNORE);
55 for (int src = 0; src < size-1; src++) {
56 Request::unref(&requests[src]);
63 int Coll_reduce_scatter_default::reduce_scatter(void *sendbuf, void *recvbuf, int *recvcounts, MPI_Datatype datatype, MPI_Op op,
66 int rank = comm->rank();
68 /* arbitrarily choose root as rank 0 */
69 int size = comm->size();
71 int *displs = xbt_new(int, size);
72 for (int i = 0; i < size; i++) {
74 count += recvcounts[i];
76 void *tmpbuf = static_cast<void*>(smpi_get_tmp_sendbuffer(count*datatype->get_extent()));
78 int ret = Coll_reduce_default::reduce(sendbuf, tmpbuf, count, datatype, op, 0, comm);
80 ret = Colls::scatterv(tmpbuf, recvcounts, displs, datatype, recvbuf, recvcounts[rank], datatype, 0, comm);
82 smpi_free_tmp_buffer(tmpbuf);
87 int Coll_allgather_default::allgather(void *sendbuf, int sendcount, MPI_Datatype sendtype,
88 void *recvbuf,int recvcount, MPI_Datatype recvtype, MPI_Comm comm)
90 const int system_tag = COLL_TAG_ALLGATHER;
93 MPI_Request *requests;
95 int rank = comm->rank();
96 int size = comm->size();
97 // FIXME: check for errors
98 recvtype->extent(&lb, &recvext);
99 // Local copy from self
100 Datatype::copy(sendbuf, sendcount, sendtype, static_cast<char *>(recvbuf) + rank * recvcount * recvext, recvcount,
102 // Send/Recv buffers to/from others;
103 requests = xbt_new(MPI_Request, 2 * (size - 1));
105 for (int other = 0; other < size; other++) {
107 requests[index] = Request::isend_init(sendbuf, sendcount, sendtype, other, system_tag,comm);
109 requests[index] = Request::irecv_init(static_cast<char *>(recvbuf) + other * recvcount * recvext, recvcount, recvtype,
110 other, system_tag, comm);
114 // Wait for completion of all comms.
115 Request::startall(2 * (size - 1), requests);
116 Request::waitall(2 * (size - 1), requests, MPI_STATUS_IGNORE);
117 for (int other = 0; other < 2*(size-1); other++) {
118 Request::unref(&requests[other]);
124 int Coll_allgatherv_default::allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf,
125 int *recvcounts, int *displs, MPI_Datatype recvtype, MPI_Comm comm)
127 const int system_tag = COLL_TAG_ALLGATHERV;
129 MPI_Aint recvext = 0;
131 int rank = comm->rank();
132 int size = comm->size();
133 recvtype->extent(&lb, &recvext);
134 // Local copy from self
135 Datatype::copy(sendbuf, sendcount, sendtype,
136 static_cast<char *>(recvbuf) + displs[rank] * recvext,recvcounts[rank], recvtype);
137 // Send buffers to others;
138 MPI_Request *requests = xbt_new(MPI_Request, 2 * (size - 1));
140 for (int other = 0; other < size; other++) {
143 Request::isend_init(sendbuf, sendcount, sendtype, other, system_tag, comm);
145 requests[index] = Request::irecv_init(static_cast<char *>(recvbuf) + displs[other] * recvext, recvcounts[other],
146 recvtype, other, system_tag, comm);
150 // Wait for completion of all comms.
151 Request::startall(2 * (size - 1), requests);
152 Request::waitall(2 * (size - 1), requests, MPI_STATUS_IGNORE);
153 for (int other = 0; other < 2*(size-1); other++) {
154 Request::unref(&requests[other]);
160 int Coll_scatter_default::scatter(void *sendbuf, int sendcount, MPI_Datatype sendtype,
161 void *recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm)
163 const int system_tag = COLL_TAG_SCATTER;
165 MPI_Aint sendext = 0;
166 MPI_Request *requests;
168 int rank = comm->rank();
169 int size = comm->size();
171 // Recv buffer from root
172 Request::recv(recvbuf, recvcount, recvtype, root, system_tag, comm, MPI_STATUS_IGNORE);
174 sendtype->extent(&lb, &sendext);
175 // Local copy from root
176 if(recvbuf!=MPI_IN_PLACE){
177 Datatype::copy(static_cast<char *>(sendbuf) + root * sendcount * sendext,
178 sendcount, sendtype, recvbuf, recvcount, recvtype);
180 // Send buffers to receivers
181 requests = xbt_new(MPI_Request, size - 1);
183 for(int dst = 0; dst < size; dst++) {
185 requests[index] = Request::isend_init(static_cast<char *>(sendbuf) + dst * sendcount * sendext, sendcount, sendtype,
186 dst, system_tag, comm);
190 // Wait for completion of isend's.
191 Request::startall(size - 1, requests);
192 Request::waitall(size - 1, requests, MPI_STATUS_IGNORE);
193 for (int dst = 0; dst < size-1; dst++) {
194 Request::unref(&requests[dst]);
203 int Coll_reduce_default::reduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root,
206 const int system_tag = COLL_TAG_REDUCE;
208 MPI_Aint dataext = 0;
210 char* sendtmpbuf = static_cast<char *>(sendbuf);
212 int rank = comm->rank();
213 int size = comm->size();
216 //non commutative case, use a working algo from openmpi
217 if (op != MPI_OP_NULL && not op->is_commutative()) {
218 return Coll_reduce_ompi_basic_linear::reduce(sendtmpbuf, recvbuf, count, datatype, op, root, comm);
221 if( sendbuf == MPI_IN_PLACE ) {
222 sendtmpbuf = static_cast<char *>(smpi_get_tmp_sendbuffer(count*datatype->get_extent()));
223 Datatype::copy(recvbuf, count, datatype,sendtmpbuf, count, datatype);
227 // Send buffer to root
228 Request::send(sendtmpbuf, count, datatype, root, system_tag, comm);
230 datatype->extent(&lb, &dataext);
231 // Local copy from root
232 if (sendtmpbuf != nullptr && recvbuf != nullptr)
233 Datatype::copy(sendtmpbuf, count, datatype, recvbuf, count, datatype);
234 // Receive buffers from senders
235 MPI_Request *requests = xbt_new(MPI_Request, size - 1);
236 void **tmpbufs = xbt_new(void *, size - 1);
238 for (int src = 0; src < size; src++) {
240 tmpbufs[index] = smpi_get_tmp_sendbuffer(count * dataext);
242 Request::irecv_init(tmpbufs[index], count, datatype, src, system_tag, comm);
246 // Wait for completion of irecv's.
247 Request::startall(size - 1, requests);
248 for (int src = 0; src < size - 1; src++) {
249 index = Request::waitany(size - 1, requests, MPI_STATUS_IGNORE);
250 XBT_DEBUG("finished waiting any request with index %d", index);
251 if(index == MPI_UNDEFINED) {
254 Request::unref(&requests[index]);
256 if(op) /* op can be MPI_OP_NULL that does nothing */
257 if(op!=MPI_OP_NULL) op->apply( tmpbufs[index], recvbuf, &count, datatype);
259 for(index = 0; index < size - 1; index++) {
260 smpi_free_tmp_buffer(tmpbufs[index]);
266 if( sendbuf == MPI_IN_PLACE ) {
267 smpi_free_tmp_buffer(sendtmpbuf);
272 int Coll_allreduce_default::allreduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
275 ret = Coll_reduce_default::reduce(sendbuf, recvbuf, count, datatype, op, 0, comm);
277 ret = Coll_bcast_default::bcast(recvbuf, count, datatype, 0, comm);
281 int Coll_alltoall_default::alltoall( void *sbuf, int scount, MPI_Datatype sdtype, void* rbuf, int rcount, MPI_Datatype rdtype, MPI_Comm comm)
283 return Coll_alltoall_ompi::alltoall(sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
288 int Coll_alltoallv_default::alltoallv(void *sendbuf, int *sendcounts, int *senddisps, MPI_Datatype sendtype,
289 void *recvbuf, int *recvcounts, int *recvdisps, MPI_Datatype recvtype, MPI_Comm comm)
291 const int system_tag = 889;
293 MPI_Aint sendext = 0;
294 MPI_Aint recvext = 0;
295 MPI_Request *requests;
298 int rank = comm->rank();
299 int size = comm->size();
300 XBT_DEBUG("<%d> algorithm basic_alltoallv() called.", rank);
301 sendtype->extent(&lb, &sendext);
302 recvtype->extent(&lb, &recvext);
303 /* Local copy from self */
304 int err = Datatype::copy(static_cast<char *>(sendbuf) + senddisps[rank] * sendext, sendcounts[rank], sendtype,
305 static_cast<char *>(recvbuf) + recvdisps[rank] * recvext, recvcounts[rank], recvtype);
306 if (err == MPI_SUCCESS && size > 1) {
307 /* Initiate all send/recv to/from others. */
308 requests = xbt_new(MPI_Request, 2 * (size - 1));
310 /* Create all receives that will be posted first */
311 for (int i = 0; i < size; ++i) {
312 if (i != rank && recvcounts[i] != 0) {
313 requests[count] = Request::irecv_init(static_cast<char *>(recvbuf) + recvdisps[i] * recvext,
314 recvcounts[i], recvtype, i, system_tag, comm);
317 XBT_DEBUG("<%d> skip request creation [src = %d, recvcounts[src] = %d]", rank, i, recvcounts[i]);
320 /* Now create all sends */
321 for (int i = 0; i < size; ++i) {
322 if (i != rank && sendcounts[i] != 0) {
323 requests[count] = Request::isend_init(static_cast<char *>(sendbuf) + senddisps[i] * sendext,
324 sendcounts[i], sendtype, i, system_tag, comm);
327 XBT_DEBUG("<%d> skip request creation [dst = %d, sendcounts[dst] = %d]", rank, i, sendcounts[i]);
330 /* Wait for them all. */
331 Request::startall(count, requests);
332 XBT_DEBUG("<%d> wait for %d requests", rank, count);
333 Request::waitall(count, requests, MPI_STATUS_IGNORE);
334 for (int i = 0; i < count; i++) {
335 if(requests[i]!=MPI_REQUEST_NULL)
336 Request::unref(&requests[i]);