1 /* Copyright (c) 2007-2017. 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. */
7 #include "simgrid/s4u/Mailbox.hpp"
8 #include "simgrid/s4u/Host.hpp"
9 #include "src/msg/msg_private.h"
10 #include "src/simix/smx_private.h"
11 #include "src/surf/surf_interface.hpp"
12 #include "src/smpi/SmpiHost.hpp"
13 #include "xbt/config.hpp"
14 #include "src/smpi/private.h"
15 #include "smpi/smpi_shared_malloc.hpp"
16 #include "src/smpi/smpi_coll.hpp"
17 #include "src/smpi/smpi_comm.hpp"
18 #include "src/smpi/smpi_group.hpp"
19 #include "src/smpi/smpi_info.hpp"
20 #include "src/smpi/smpi_process.hpp"
25 #include <float.h> /* DBL_MAX */
29 #include <sys/sendfile.h>
32 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
33 #include <boost/tokenizer.hpp>
34 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
37 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
38 * See https://www.akkadia.org/drepper/dsohowto.pdf
39 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
41 #define RTLD_DEEPBIND 0
46 const char* papi_default_config_name = "default";
48 struct papi_process_data {
49 papi_counter_t counter_data;
54 std::unordered_map<std::string, double> location2speedup;
56 simgrid::smpi::Process **process_data = nullptr;
57 int process_count = 0;
58 int smpi_universe_size = 0;
59 int* index_to_process_data = nullptr;
60 extern double smpi_total_benched_time;
61 xbt_os_timer_t global_timer;
62 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
63 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
64 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
65 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
66 static simgrid::config::Flag<double> smpi_wtime_sleep(
67 "smpi/wtime", "Minimum time to inject inside a call to MPI_Wtime", 0.0);
68 static simgrid::config::Flag<double> smpi_init_sleep(
69 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
71 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
73 int smpi_process_count()
78 simgrid::smpi::Process* smpi_process()
80 smx_actor_t me = SIMIX_process_self();
81 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
83 simgrid::MsgActorExt* msgExt = static_cast<simgrid::MsgActorExt*>(me->data);
84 return static_cast<simgrid::smpi::Process*>(msgExt->data);
87 simgrid::smpi::Process* smpi_process_remote(int index)
89 return process_data[index_to_process_data[index]];
92 MPI_Comm smpi_process_comm_self(){
93 return smpi_process()->comm_self();
96 void smpi_process_init(int *argc, char ***argv){
97 simgrid::smpi::Process::init(argc, argv);
100 int smpi_process_index(){
101 return smpi_process()->index();
104 void * smpi_process_get_user_data(){
105 return smpi_process()->get_user_data();
108 void smpi_process_set_user_data(void *data){
109 return smpi_process()->set_user_data(data);
113 int smpi_global_size()
115 char *value = getenv("SMPI_GLOBAL_SIZE");
116 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
118 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
121 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
123 smpi_comm_copy_data_callback = callback;
126 static void print(std::vector<std::pair<size_t, size_t>> vec) {
127 std::fprintf(stderr, "{");
128 for (auto elt : vec) {
129 std::fprintf(stderr, "(0x%zx, 0x%zx),", elt.first, elt.second);
131 std::fprintf(stderr, "}\n");
133 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
135 for(auto block : private_blocks) {
136 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
140 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
141 for(auto block : private_blocks) {
142 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
146 void smpi_comm_copy_buffer_callback(smx_activity_t synchro, void *buff, size_t buff_size)
148 simgrid::kernel::activity::Comm *comm = dynamic_cast<simgrid::kernel::activity::Comm*>(synchro);
151 size_t src_offset = 0;
152 size_t dst_offset = 0;
153 std::vector<std::pair<size_t, size_t>> src_private_blocks;
154 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
155 XBT_DEBUG("Copy the data over");
156 if((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
157 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
158 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
161 src_private_blocks.clear();
162 src_private_blocks.push_back(std::make_pair(0, buff_size));
164 if((dst_shared=smpi_is_shared((char*)comm->dst_buff, dst_private_blocks, &dst_offset))) {
165 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff);
166 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
169 dst_private_blocks.clear();
170 dst_private_blocks.push_back(std::make_pair(0, buff_size));
172 check_blocks(src_private_blocks, buff_size);
173 check_blocks(dst_private_blocks, buff_size);
174 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
175 check_blocks(private_blocks, buff_size);
177 if((smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) && (static_cast<char*>(buff) >= smpi_start_data_exe)
178 && (static_cast<char*>(buff) < smpi_start_data_exe + smpi_size_data_exe )
180 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
182 smpi_switch_data_segment(
183 (static_cast<simgrid::smpi::Process*>((static_cast<simgrid::MsgActorExt*>(comm->src_proc->data)->data))->index()));
184 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
185 memcpy_private(tmpbuff, buff, private_blocks);
188 if((smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) && ((char*)comm->dst_buff >= smpi_start_data_exe)
189 && ((char*)comm->dst_buff < smpi_start_data_exe + smpi_size_data_exe )){
190 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
191 smpi_switch_data_segment(
192 (static_cast<simgrid::smpi::Process*>((static_cast<simgrid::MsgActorExt*>(comm->dst_proc->data)->data))->index()));
194 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff,comm->dst_buff);
195 memcpy_private(comm->dst_buff, tmpbuff, private_blocks);
197 if (comm->detached) {
198 // if this is a detached send, the source buffer was duplicated by SMPI
199 // sender to make the original buffer available to the application ASAP
201 //It seems that the request is used after the call there this should be free somewhere else but where???
202 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
203 comm->src_buff = nullptr;
205 if(tmpbuff!=buff)xbt_free(tmpbuff);
209 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
211 /* nothing done in this version */
214 static void smpi_check_options(){
215 //check correctness of MPI parameters
217 xbt_assert(xbt_cfg_get_int("smpi/async-small-thresh") <= xbt_cfg_get_int("smpi/send-is-detached-thresh"));
219 if (xbt_cfg_is_default_value("smpi/host-speed")) {
220 XBT_INFO("You did not set the power of the host running the simulation. "
221 "The timings will certainly not be accurate. "
222 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
223 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
226 xbt_assert(xbt_cfg_get_double("smpi/cpu-threshold") >=0,
227 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
228 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
232 return process_data != nullptr;
235 void smpi_global_init()
239 if (!MC_is_active()) {
240 global_timer = xbt_os_timer_new();
241 xbt_os_walltimer_start(global_timer);
244 if (xbt_cfg_get_string("smpi/comp-adjustment-file")[0] != '\0') {
245 std::string filename {xbt_cfg_get_string("smpi/comp-adjustment-file")};
246 std::ifstream fstream(filename);
247 if (!fstream.is_open()) {
248 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
252 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
253 std::getline(fstream, line); // Skip the header line
254 while (std::getline(fstream, line)) {
256 Tokenizer::iterator it = tok.begin();
257 Tokenizer::iterator end = std::next(tok.begin());
259 std::string location = *it;
260 boost::trim(location);
261 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
266 // This map holds for each computation unit (such as "default" or "process1" etc.)
267 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
268 // and the (computed) event_set.
269 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
271 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
272 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
273 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
274 " Expected version is %i",
277 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
278 boost::char_separator<char> separator_units(";");
279 std::string str = std::string(xbt_cfg_get_string("smpi/papi-events"));
280 Tokenizer tokens(str, separator_units);
282 // Iterate over all the computational units. This could be
283 // processes, hosts, threads, ranks... You name it. I'm not exactly
284 // sure what we will support eventually, so I'll leave it at the
285 // general term "units".
286 for (auto& unit_it : tokens) {
287 boost::char_separator<char> separator_events(":");
288 Tokenizer event_tokens(unit_it, separator_events);
290 int event_set = PAPI_NULL;
291 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
292 // TODO: Should this let the whole simulation die?
293 XBT_CRITICAL("Could not create PAPI event set during init.");
296 // NOTE: We cannot use a map here, as we must obey the order of the counters
297 // This is important for PAPI: We need to map the values of counters back
298 // to the event_names (so, when PAPI_read() has finished)!
299 papi_counter_t counters2values;
301 // Iterate over all counters that were specified for this specific
303 // Note that we need to remove the name of the unit
304 // (that could also be the "default" value), which always comes first.
305 // Hence, we start at ++(events.begin())!
306 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); events_it++) {
308 int event_code = PAPI_NULL;
309 char* event_name = const_cast<char*>((*events_it).c_str());
310 if (PAPI_event_name_to_code(event_name, &event_code) == PAPI_OK) {
311 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
312 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
315 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
318 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
322 counters2values.push_back(
323 // We cannot just pass *events_it, as this is of type const basic_string
324 std::make_pair<std::string, long long>(std::string(*events_it), 0));
327 std::string unit_name = *(event_tokens.begin());
328 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
330 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
336 msg_bar_t finalization_barrier = nullptr;
337 if (process_count == 0){
338 process_count = SIMIX_process_count();
340 finalization_barrier = MSG_barrier_init(process_count);
342 smpi_universe_size = process_count;
343 process_data = new simgrid::smpi::Process*[process_count];
344 for (int i = 0; i < process_count; i++) {
345 process_data[i] = new simgrid::smpi::Process(i, finalization_barrier);
347 //if the process was launched through smpirun script we generate a global mpi_comm_world
348 //if not, we let MPI_COMM_NULL, and the comm world will be private to each mpi instance
350 group = new simgrid::smpi::Group(process_count);
351 MPI_COMM_WORLD = new simgrid::smpi::Comm(group, nullptr);
352 MPI_Attr_put(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, reinterpret_cast<void *>(process_count));
354 for (int i = 0; i < process_count; i++)
355 group->set_mapping(i, i);
359 void smpi_global_destroy()
361 int count = smpi_process_count();
363 smpi_bench_destroy();
364 smpi_shared_destroy();
365 if (MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED){
366 delete MPI_COMM_WORLD->group();
367 MSG_barrier_destroy(process_data[0]->finalization_barrier());
369 smpi_deployment_cleanup_instances();
371 for (int i = 0; i < count; i++) {
372 if(process_data[i]->comm_self()!=MPI_COMM_NULL){
373 simgrid::smpi::Comm::destroy(process_data[i]->comm_self());
375 if(process_data[i]->comm_intra()!=MPI_COMM_NULL){
376 simgrid::smpi::Comm::destroy(process_data[i]->comm_intra());
378 xbt_os_timer_free(process_data[i]->timer());
379 xbt_mutex_destroy(process_data[i]->mailboxes_mutex());
380 delete process_data[i];
382 delete[] process_data;
383 process_data = nullptr;
385 if (MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED){
386 MPI_COMM_WORLD->cleanup_smp();
387 MPI_COMM_WORLD->cleanup_attr<simgrid::smpi::Comm>();
388 if(simgrid::smpi::Colls::smpi_coll_cleanup_callback!=nullptr)
389 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
390 delete MPI_COMM_WORLD;
393 MPI_COMM_WORLD = MPI_COMM_NULL;
395 if (!MC_is_active()) {
396 xbt_os_timer_free(global_timer);
399 xbt_free(index_to_process_data);
400 if(smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP)
401 smpi_destroy_global_memory_segments();
407 static void smpi_init_logs(){
409 /* Connect log categories. See xbt/log.c */
411 XBT_LOG_CONNECT(smpi); /* Keep this line as soon as possible in this function: xbt_log_appender_file.c depends on it
412 DO NOT connect this in XBT or so, or it will be useless to xbt_log_appender_file.c */
413 XBT_LOG_CONNECT(instr_smpi);
414 XBT_LOG_CONNECT(smpi_bench);
415 XBT_LOG_CONNECT(smpi_coll);
416 XBT_LOG_CONNECT(smpi_colls);
417 XBT_LOG_CONNECT(smpi_comm);
418 XBT_LOG_CONNECT(smpi_datatype);
419 XBT_LOG_CONNECT(smpi_dvfs);
420 XBT_LOG_CONNECT(smpi_group);
421 XBT_LOG_CONNECT(smpi_kernel);
422 XBT_LOG_CONNECT(smpi_mpi);
423 XBT_LOG_CONNECT(smpi_memory);
424 XBT_LOG_CONNECT(smpi_op);
425 XBT_LOG_CONNECT(smpi_pmpi);
426 XBT_LOG_CONNECT(smpi_request);
427 XBT_LOG_CONNECT(smpi_replay);
428 XBT_LOG_CONNECT(smpi_rma);
429 XBT_LOG_CONNECT(smpi_shared);
430 XBT_LOG_CONNECT(smpi_utils);
434 static void smpi_init_options(){
435 //return if already called
436 if (smpi_cpu_threshold > -1)
438 simgrid::smpi::Colls::set_collectives();
439 simgrid::smpi::Colls::smpi_coll_cleanup_callback=nullptr;
440 smpi_cpu_threshold = xbt_cfg_get_double("smpi/cpu-threshold");
441 smpi_host_speed = xbt_cfg_get_double("smpi/host-speed");
442 const char* smpi_privatize_option = xbt_cfg_get_string("smpi/privatization");
443 if (std::strcmp(smpi_privatize_option, "no") == 0)
444 smpi_privatize_global_variables = SMPI_PRIVATIZE_NONE;
445 else if (std::strcmp(smpi_privatize_option, "yes") == 0)
446 smpi_privatize_global_variables = SMPI_PRIVATIZE_DEFAULT;
447 else if (std::strcmp(smpi_privatize_option, "mmap") == 0)
448 smpi_privatize_global_variables = SMPI_PRIVATIZE_MMAP;
449 else if (std::strcmp(smpi_privatize_option, "dlopen") == 0)
450 smpi_privatize_global_variables = SMPI_PRIVATIZE_DLOPEN;
452 // Some compatibility stuff:
453 else if (std::strcmp(smpi_privatize_option, "1") == 0)
454 smpi_privatize_global_variables = SMPI_PRIVATIZE_DEFAULT;
455 else if (std::strcmp(smpi_privatize_option, "0") == 0)
456 smpi_privatize_global_variables = SMPI_PRIVATIZE_NONE;
459 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option);
461 #if defined(__FreeBSD__)
462 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) {
463 XBT_INFO("Mixing mmap privatization is broken on FreeBSD, switching to dlopen privatization instead.");
464 smpi_privatize_global_variables = SMPI_PRIVATIZE_DLOPEN;
468 if (smpi_cpu_threshold < 0)
469 smpi_cpu_threshold = DBL_MAX;
471 char* val = xbt_cfg_get_string("smpi/shared-malloc");
472 if (!strcasecmp(val, "yes") || !strcmp(val, "1") || !strcasecmp(val, "on") || !strcasecmp(val, "global")) {
473 smpi_cfg_shared_malloc = shmalloc_global;
474 } else if (!strcasecmp(val, "local")) {
475 smpi_cfg_shared_malloc = shmalloc_local;
476 } else if (!strcasecmp(val, "no") || !strcmp(val, "0") || !strcasecmp(val, "off")) {
477 smpi_cfg_shared_malloc = shmalloc_none;
479 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
484 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
485 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
486 typedef void (*smpi_fortran_entry_point_type)();
488 static int smpi_run_entry_point(smpi_entry_point_type entry_point, std::vector<std::string> args)
490 const int argc = args.size();
491 std::unique_ptr<char*[]> argv(new char*[argc + 1]);
492 for (int i = 0; i != argc; ++i)
493 argv[i] = args[i].empty() ? const_cast<char*>(""): &args[i].front();
494 argv[argc] = nullptr;
496 int res = entry_point(argc, argv.get());
498 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
499 smpi_process()->set_return_value(res);
504 // TODO, remove the number of functions involved here
505 static smpi_entry_point_type smpi_resolve_function(void* handle)
507 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
508 if (entry_point_fortran != nullptr) {
509 return [entry_point_fortran](int argc, char** argv) {
510 smpi_process_init(&argc, &argv);
511 entry_point_fortran();
516 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
517 if (entry_point != nullptr) {
521 return smpi_entry_point_type();
524 int smpi_main(const char* executable, int argc, char *argv[])
526 srand(SMPI_RAND_SEED);
528 if (getenv("SMPI_PRETEND_CC") != nullptr) {
529 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
530 * configuration tools */
534 TRACE_global_init(&argc, argv);
536 SIMIX_global_init(&argc, argv);
537 MSG_init(&argc,argv);
539 SMPI_switch_data_segment = &smpi_switch_data_segment;
541 simgrid::s4u::Host::onCreation.connect([](simgrid::s4u::Host& host) {
542 host.extension_set(new simgrid::smpi::SmpiHost(&host));
545 // parse the platform file: get the host list
546 SIMIX_create_environment(argv[1]);
547 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
549 static std::size_t rank = 0;
553 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_DLOPEN) {
555 std::string executable_copy = executable;
557 // Prepare the copy of the binary (get its size)
558 struct stat fdin_stat;
559 stat(executable_copy.c_str(), &fdin_stat);
560 off_t fdin_size = fdin_stat.st_size;
562 simix_global->default_function = [executable_copy, fdin_size](std::vector<std::string> args) {
563 return std::function<void()>([executable_copy, fdin_size, args] {
565 // Copy the dynamic library:
566 std::string target_executable = executable_copy
567 + "_" + std::to_string(getpid())
568 + "_" + std::to_string(rank++) + ".so";
570 int fdin = open(executable_copy.c_str(), O_RDONLY);
571 xbt_assert(fdin >= 0, "Cannot read from %s", executable_copy.c_str());
572 int fdout = open(target_executable.c_str(), O_CREAT | O_RDWR, S_IRWXU);
573 xbt_assert(fdout >= 0, "Cannot write into %s", target_executable.c_str());
576 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
577 xbt_assert(sent_size == fdin_size,
578 "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
579 target_executable.c_str(), sent_size, fdin_size, errno, strerror(errno));
581 XBT_VERB("Copy %d bytes into %s", static_cast<int>(fdin_size), target_executable.c_str());
582 const int bufsize = 1024 * 1024 * 4;
584 while (int got = read(fdin, buf, bufsize)) {
586 xbt_assert(errno == EINTR, "Cannot read from %s", executable_copy.c_str());
590 while (int done = write(fdout, p, todo)) {
592 xbt_assert(errno == EINTR, "Cannot write into %s", target_executable.c_str());
604 // Load the copy and resolve the entry point:
605 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
606 if (xbt_cfg_get_boolean("smpi/keep-temps") == false)
607 unlink(target_executable.c_str());
608 if (handle == nullptr)
609 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), errno, strerror(errno));
610 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
612 xbt_die("Could not resolve entry point");
614 smpi_run_entry_point(entry_point, args);
621 // Load the dynamic library and resolve the entry point:
622 void* handle = dlopen(executable, RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
623 if (handle == nullptr)
624 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable, dlerror(), errno, strerror(errno));
625 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
627 xbt_die("main not found in %s", executable);
628 // TODO, register the executable for SMPI privatization
630 // Execute the same entry point for each simulated process:
631 simix_global->default_function = [entry_point](std::vector<std::string> args) {
632 return std::function<void()>([entry_point, args] {
633 smpi_run_entry_point(entry_point, args);
639 SIMIX_launch_application(argv[2]);
643 /* Clean IO before the run */
647 if (MC_is_active()) {
653 xbt_os_walltimer_stop(global_timer);
654 if (xbt_cfg_get_boolean("smpi/display-timing")){
655 double global_time = xbt_os_timer_elapsed(global_timer);
656 XBT_INFO("Simulated time: %g seconds. \n\n"
657 "The simulation took %g seconds (after parsing and platform setup)\n"
658 "%g seconds were actual computation of the application",
659 SIMIX_get_clock(), global_time , smpi_total_benched_time);
661 if (smpi_total_benched_time/global_time>=0.75)
662 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
663 "You may want to use sampling functions or trace replay to reduce this.");
666 int count = smpi_process_count();
668 for (i = 0; i < count; i++) {
669 if(process_data[i]->return_value()!=0){
670 ret=process_data[i]->return_value();//return first non 0 value
674 smpi_global_destroy();
681 // Called either directly from the user code, or from the code called by smpirun
686 smpi_check_options();
688 simgrid::surf::surfExitCallbacks.connect(TRACE_smpi_release);
689 if(smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP)
690 smpi_initialize_global_memory_segments();
693 void SMPI_finalize(){
694 smpi_global_destroy();
697 void smpi_mpi_init() {
698 if(smpi_init_sleep > 0)
699 simcall_process_sleep(smpi_init_sleep);
702 double smpi_mpi_wtime(){
704 if (smpi_process()->initialized() != 0 && smpi_process()->finalized() == 0 && smpi_process()->sampling() == 0) {
706 time = SIMIX_get_clock();
707 // to avoid deadlocks if used as a break condition, such as
708 // while (MPI_Wtime(...) < time_limit) {
711 // because the time will not normally advance when only calls to MPI_Wtime
712 // are made -> deadlock (MPI_Wtime never reaches the time limit)
713 if(smpi_wtime_sleep > 0)
714 simcall_process_sleep(smpi_wtime_sleep);
717 time = SIMIX_get_clock();