1 /* Copyright (c) 2010-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "smpi_comm.hpp"
7 #include "smpi_coll.hpp"
8 #include "smpi_datatype.hpp"
9 #include "smpi_request.hpp"
10 #include "smpi_win.hpp"
11 #include "src/smpi/include/smpi_actor.hpp"
12 #include "src/surf/HostImpl.hpp"
16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_comm, smpi, "Logging specific to SMPI (comm)");
18 simgrid::smpi::Comm mpi_MPI_COMM_UNINITIALIZED;
19 MPI_Comm MPI_COMM_UNINITIALIZED=&mpi_MPI_COMM_UNINITIALIZED;
21 /* Support for cartesian topology was added, but there are 2 other types of topology, graph et dist graph. In order to
22 * support them, we have to add a field SMPI_Topo_type, and replace the MPI_Topology field by an union. */
27 std::unordered_map<int, smpi_key_elem> Comm::keyvals_;
28 int Comm::keyval_id_=0;
30 Comm::Comm(MPI_Group group, MPI_Topology topo, int smp) : group_(group), topo_(topo),is_smp_comm_(smp)
33 topoType_ = MPI_INVALID_TOPO;
34 intra_comm_ = MPI_COMM_NULL;
35 leaders_comm_ = MPI_COMM_NULL;
37 non_uniform_map_ = nullptr;
38 leaders_map_ = nullptr;
42 void Comm::destroy(Comm* comm)
44 if (comm == MPI_COMM_UNINITIALIZED){
45 Comm::destroy(smpi_process()->comm_world());
48 delete comm->topo_; // there's no use count on topos
52 int Comm::dup(MPI_Comm* newcomm){
53 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
54 // we need to switch as the called function may silently touch global variables
55 smpi_switch_data_segment(s4u::Actor::self());
57 MPI_Group cp = new Group(this->group());
58 (*newcomm) = new Comm(cp, this->topo());
59 int ret = MPI_SUCCESS;
61 if (not attributes()->empty()) {
63 void* value_out=nullptr;
64 for (auto const& it : *attributes()) {
65 smpi_key_elem elem = keyvals_.at(it.first);
67 if( elem->copy_fn.comm_copy_fn != MPI_NULL_COPY_FN &&
68 elem->copy_fn.comm_copy_fn != MPI_COMM_DUP_FN)
69 ret = elem->copy_fn.comm_copy_fn(this, it.first, elem->extra_state, it.second, &value_out, &flag);
70 else if ( elem->copy_fn.comm_copy_fn_fort != MPI_NULL_COPY_FN &&
71 *(int*)*elem->copy_fn.comm_copy_fn_fort != 1){
72 value_out=(int*)xbt_malloc(sizeof(int));
73 elem->copy_fn.comm_copy_fn_fort(this, it.first, elem->extra_state, it.second, value_out, &flag,&ret);
75 if (ret != MPI_SUCCESS) {
76 Comm::destroy(*newcomm);
77 *newcomm = MPI_COMM_NULL;
80 if (elem->copy_fn.comm_copy_fn == MPI_COMM_DUP_FN ||
81 ((elem->copy_fn.comm_copy_fn_fort != MPI_NULL_COPY_FN) && *(int*)*elem->copy_fn.comm_copy_fn_fort == 1)){
83 (*newcomm)->attributes()->insert({it.first, it.second});
86 (*newcomm)->attributes()->insert({it.first, value_out});
94 MPI_Group Comm::group()
96 if (this == MPI_COMM_UNINITIALIZED)
97 return smpi_process()->comm_world()->group();
103 if (this == MPI_COMM_UNINITIALIZED)
104 return smpi_process()->comm_world()->size();
105 return group_->size();
110 if (this == MPI_COMM_UNINITIALIZED)
111 return smpi_process()->comm_world()->rank();
112 return group_->rank(s4u::Actor::self());
115 void Comm::get_name (char* name, int* len)
117 if (this == MPI_COMM_UNINITIALIZED){
118 smpi_process()->comm_world()->get_name(name, len);
121 if(this == MPI_COMM_WORLD && name_.empty()) {
122 strncpy(name, "MPI_COMM_WORLD", 15);
124 } else if(this == MPI_COMM_SELF && name_.empty()) {
125 strncpy(name, "MPI_COMM_SELF", 14);
128 *len = snprintf(name, MPI_MAX_NAME_STRING+1, "%s", name_.c_str());
132 void Comm::set_name (char* name)
134 if (this == MPI_COMM_UNINITIALIZED){
135 smpi_process()->comm_world()->set_name(name);
138 name_.replace (0, MPI_MAX_NAME_STRING+1, name);
142 void Comm::set_leaders_comm(MPI_Comm leaders){
143 if (this == MPI_COMM_UNINITIALIZED){
144 smpi_process()->comm_world()->set_leaders_comm(leaders);
147 leaders_comm_=leaders;
150 int* Comm::get_non_uniform_map(){
151 if (this == MPI_COMM_UNINITIALIZED)
152 return smpi_process()->comm_world()->get_non_uniform_map();
153 return non_uniform_map_;
156 int* Comm::get_leaders_map(){
157 if (this == MPI_COMM_UNINITIALIZED)
158 return smpi_process()->comm_world()->get_leaders_map();
162 MPI_Comm Comm::get_leaders_comm(){
163 if (this == MPI_COMM_UNINITIALIZED)
164 return smpi_process()->comm_world()->get_leaders_comm();
165 return leaders_comm_;
168 MPI_Comm Comm::get_intra_comm(){
169 if (this == MPI_COMM_UNINITIALIZED || this==MPI_COMM_WORLD)
170 return smpi_process()->comm_intra();
171 else return intra_comm_;
174 int Comm::is_uniform(){
175 if (this == MPI_COMM_UNINITIALIZED)
176 return smpi_process()->comm_world()->is_uniform();
180 int Comm::is_blocked(){
181 if (this == MPI_COMM_UNINITIALIZED)
182 return smpi_process()->comm_world()->is_blocked();
186 int Comm::is_smp_comm(){
187 if (this == MPI_COMM_UNINITIALIZED)
188 return smpi_process()->comm_world()->is_smp_comm();
192 MPI_Comm Comm::split(int color, int key)
194 if (this == MPI_COMM_UNINITIALIZED)
195 return smpi_process()->comm_world()->split(color, key);
196 int system_tag = 123;
199 MPI_Group group_root = nullptr;
200 MPI_Group group_out = nullptr;
201 MPI_Group group = this->group();
202 int myrank = this->rank();
203 int size = this->size();
204 /* Gather all colors and keys on rank 0 */
205 int* sendbuf = xbt_new(int, 2);
209 recvbuf = xbt_new(int, 2 * size);
213 Coll_gather_default::gather(sendbuf, 2, MPI_INT, recvbuf, 2, MPI_INT, 0, this);
215 /* Do the actual job */
217 MPI_Group* group_snd = xbt_new(MPI_Group, size);
218 std::vector<std::pair<int, int>> rankmap;
219 rankmap.reserve(size);
220 for (int i = 0; i < size; i++) {
221 if (recvbuf[2 * i] != MPI_UNDEFINED) {
223 for (int j = i + 1; j < size; j++) {
224 if(recvbuf[2 * i] == recvbuf[2 * j]) {
225 recvbuf[2 * j] = MPI_UNDEFINED;
226 rankmap.push_back({recvbuf[2 * j + 1], j});
229 /* Add self in the group */
230 recvbuf[2 * i] = MPI_UNDEFINED;
231 rankmap.push_back({recvbuf[2 * i + 1], i});
232 std::sort(begin(rankmap), end(rankmap));
233 group_out = new Group(rankmap.size());
235 group_root = group_out; /* Save root's group */
237 for (unsigned j = 0; j < rankmap.size(); j++) {
238 s4u::ActorPtr actor = group->actor(rankmap[j].second);
239 group_out->set_mapping(actor, j);
241 MPI_Request* requests = xbt_new(MPI_Request, rankmap.size());
243 for (auto const& rank : rankmap) {
244 if (rank.second != 0) {
245 group_snd[reqs]=new Group(group_out);
246 requests[reqs] = Request::isend(&(group_snd[reqs]), 1, MPI_PTR, rank.second, system_tag, this);
250 if(i != 0 && group_out != MPI_COMM_WORLD->group() && group_out != MPI_GROUP_EMPTY)
251 Group::unref(group_out);
253 Request::waitall(reqs, requests, MPI_STATUS_IGNORE);
259 group_out = group_root; /* exit with root's group */
261 if(color != MPI_UNDEFINED) {
262 Request::recv(&group_out, 1, MPI_PTR, 0, system_tag, this, MPI_STATUS_IGNORE);
263 } /* otherwise, exit with group_out == nullptr */
265 return group_out!=nullptr ? new Comm(group_out, nullptr) : MPI_COMM_NULL;
269 if (this == MPI_COMM_UNINITIALIZED){
270 smpi_process()->comm_world()->ref();
277 void Comm::cleanup_smp(){
278 if (intra_comm_ != MPI_COMM_NULL)
279 Comm::unref(intra_comm_);
280 if (leaders_comm_ != MPI_COMM_NULL)
281 Comm::unref(leaders_comm_);
282 xbt_free(non_uniform_map_);
283 delete[] leaders_map_;
286 void Comm::unref(Comm* comm){
287 if (comm == MPI_COMM_UNINITIALIZED){
288 Comm::unref(smpi_process()->comm_world());
292 Group::unref(comm->group_);
294 if(comm->refcount_==0){
296 comm->cleanup_attr<Comm>();
301 void Comm::init_smp(){
304 if (this == MPI_COMM_UNINITIALIZED)
305 smpi_process()->comm_world()->init_smp();
307 int comm_size = this->size();
309 // If we are in replay - perform an ugly hack
310 // tell SimGrid we are not in replay for a while, because we need the buffers to be copied for the following calls
311 bool replaying = false; //cache data to set it back again after
312 if(smpi_process()->replaying()){
314 smpi_process()->set_replaying(false);
317 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
318 // we need to switch as the called function may silently touch global variables
319 smpi_switch_data_segment(s4u::Actor::self());
321 //identify neighbours in comm
322 //get the indices of all processes sharing the same simix host
323 auto& process_list = sg_host_self()->pimpl_->process_list_;
324 int intra_comm_size = 0;
325 int min_index = INT_MAX; // the minimum index will be the leader
326 for (auto& actor : process_list) {
327 int index = actor.get_pid();
328 if (this->group()->rank(actor.iface()) != MPI_UNDEFINED) { // Is this process in the current group?
330 if (index < min_index)
334 XBT_DEBUG("number of processes deployed on my node : %d", intra_comm_size);
335 MPI_Group group_intra = new Group(intra_comm_size);
337 for (auto& actor : process_list) {
338 if (this->group()->rank(actor.iface()) != MPI_UNDEFINED) {
339 group_intra->set_mapping(actor.iface(), i);
344 MPI_Comm comm_intra = new Comm(group_intra, nullptr, 1);
347 int* leaders_map = new int[comm_size];
348 int* leader_list = new int[comm_size];
349 std::fill_n(leaders_map, comm_size, 0);
350 std::fill_n(leader_list, comm_size, -1);
352 Coll_allgather_ring::allgather(&leader, 1, MPI_INT , leaders_map, 1, MPI_INT, this);
354 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
355 // we need to switch as the called function may silently touch global variables
356 smpi_switch_data_segment(s4u::Actor::self());
359 if(leaders_map_==nullptr){
360 leaders_map_= leaders_map;
362 delete[] leaders_map;
364 int leader_group_size = 0;
365 for(i=0; i<comm_size; i++){
366 int already_done = 0;
367 for (int j = 0; j < leader_group_size; j++) {
368 if (leaders_map_[i] == leader_list[j]) {
372 if (already_done == 0) {
373 leader_list[leader_group_size] = leaders_map_[i];
377 std::sort(leader_list, leader_list + leader_group_size);
379 MPI_Group leaders_group = new Group(leader_group_size);
381 MPI_Comm leader_comm = MPI_COMM_NULL;
382 if(MPI_COMM_WORLD!=MPI_COMM_UNINITIALIZED && this!=MPI_COMM_WORLD){
383 //create leader_communicator
384 for (i=0; i< leader_group_size;i++)
385 leaders_group->set_mapping(s4u::Actor::by_pid(leader_list[i]), i);
386 leader_comm = new Comm(leaders_group, nullptr,1);
387 this->set_leaders_comm(leader_comm);
388 this->set_intra_comm(comm_intra);
390 // create intracommunicator
392 for (i=0; i< leader_group_size;i++)
393 leaders_group->set_mapping(s4u::Actor::by_pid(leader_list[i]), i);
395 if(this->get_leaders_comm()==MPI_COMM_NULL){
396 leader_comm = new Comm(leaders_group, nullptr,1);
397 this->set_leaders_comm(leader_comm);
399 leader_comm=this->get_leaders_comm();
400 Group::unref(leaders_group);
402 smpi_process()->set_comm_intra(comm_intra);
405 // Are the nodes uniform ? = same number of process/node
406 int my_local_size=comm_intra->size();
407 if(comm_intra->rank()==0) {
409 int* non_uniform_map = xbt_new0(int,leader_group_size);
410 Coll_allgather_ring::allgather(&my_local_size, 1, MPI_INT,
411 non_uniform_map, 1, MPI_INT, leader_comm);
412 for(i=0; i < leader_group_size; i++) {
413 if(non_uniform_map[0] != non_uniform_map[i]) {
418 if(is_uniform==0 && this->is_uniform()!=0){
419 non_uniform_map_ = non_uniform_map;
421 xbt_free(non_uniform_map);
423 is_uniform_=is_uniform;
425 Coll_bcast_scatter_LR_allgather::bcast(&(is_uniform_),1, MPI_INT, 0, comm_intra );
427 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
428 // we need to switch as the called function may silently touch global variables
429 smpi_switch_data_segment(s4u::Actor::self());
431 // Are the ranks blocked ? = allocated contiguously on the SMP nodes
433 int prev=this->group()->rank(comm_intra->group()->actor(0));
434 for (i = 1; i < my_local_size; i++) {
435 int that = this->group()->rank(comm_intra->group()->actor(i));
436 if (that != prev + 1) {
444 Coll_allreduce_default::allreduce(&is_blocked, &(global_blocked), 1, MPI_INT, MPI_LAND, this);
446 if(MPI_COMM_WORLD==MPI_COMM_UNINITIALIZED || this==MPI_COMM_WORLD){
448 is_blocked_ = global_blocked;
451 is_blocked_=global_blocked;
453 delete[] leader_list;
456 smpi_process()->set_replaying(true);
459 MPI_Comm Comm::f2c(int id) {
461 return MPI_COMM_SELF;
463 return MPI_COMM_WORLD;
464 } else if(F2C::f2c_lookup() != nullptr && id >= 0) {
466 const auto& lookup = F2C::f2c_lookup();
467 auto comm = lookup->find(get_key_id(key, id));
468 return comm == lookup->end() ? MPI_COMM_NULL : static_cast<MPI_Comm>(comm->second);
470 return MPI_COMM_NULL;
474 void Comm::free_f(int id) {
476 F2C::f2c_lookup()->erase(id == 0 ? get_key(key, id) : get_key_id(key, id));
480 if(F2C::f2c_lookup()==nullptr){
481 F2C::set_f2c_lookup(new std::unordered_map<std::string, F2C*>);
484 (*(F2C::f2c_lookup()))[this == MPI_COMM_WORLD ? get_key(key, F2C::f2c_id()) : get_key_id(key, F2C::f2c_id())] = this;
486 return F2C::f2c_id()-1;
489 void Comm::add_rma_win(MPI_Win win){
490 rma_wins_.push_back(win);
493 void Comm::remove_rma_win(MPI_Win win){
494 rma_wins_.remove(win);
497 void Comm::finish_rma_calls(){
498 for (auto const& it : rma_wins_) {
499 if(it->rank()==this->rank()){//is it ours (for MPI_COMM_WORLD)?
500 int finished = it->finish_comms();
501 XBT_DEBUG("Barrier for rank %d - Finished %d RMA calls",this->rank(), finished);
506 MPI_Comm Comm::split_type(int type, int key, MPI_Info info)
508 if(type != MPI_COMM_TYPE_SHARED){
509 return MPI_COMM_NULL;
513 this->get_intra_comm()->ref();
514 return this->get_intra_comm();
518 } // namespace simgrid